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drs_umn

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Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com>
Co-authored-by: wangdengke2 <wangdengke2@huawei.com>
Co-committed-by: wangdengke2 <wangdengke2@huawei.com>
This commit is contained in:
Wang , Deng Ke
2025-09-16 08:01:12 +00:00
committed by zuul
parent 05458809ab
commit bc0c808038
38 changed files with 1110 additions and 1145 deletions
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<div class="fignone" id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0000001102434640_en-us_topic_0171122769_fig2922183194716"><a name="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0000001102434640_en-us_topic_0171122769_fig2922183194716"></a><a name="en-us_topic_0000001205747781_en-us_topic_0000001102434640_en-us_topic_0171122769_fig2922183194716"></a><span class="figcap"><b>Figure 1 </b>Region and AZ</span><br><span><img id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0000001102434640_image221039023" src="en-us_image_0000001710470628.png"></span></div>
</div>
<div class="section" id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0172714178_section415012145264"><h4 class="sectiontitle">Project</h4><p id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0172714178_p1289616261242">A project corresponds to a region. Projects group and isolate resources (including compute, storage, and network resources) across physical regions. Users can be granted permissions in a default project to access all resources in the region associated with the project. If you need more refined access control, create subprojects under a default project and create resources in subprojects. Then you can assign users the permissions required to access only the resources in the specific subprojects.</p>
<div class="fignone" id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0172714178_fig1032520265332"><span class="figcap"><b>Figure 2 </b>Project isolating model</span><br><span><img id="drs_01_0005__image981019561334" src="en-us_image_0000001815857830.png"></span></div>
<div class="fignone" id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0172714178_fig1032520265332"><span class="figcap"><b>Figure 2 </b>Project isolating model</span><br><span><img id="drs_01_0005__image981019561334" src="en-us_image_0000001815857830.png" title="Click to enlarge" class="imgResize"></span></div>
</div>
<div class="section" id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0000001102434640_section13642481187"><h4 class="sectiontitle">Account Entrustment</h4><p id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0000001102434640_p4627484188">DRS will <span class="keyword" id="drs_01_0005__en-us_topic_0000001205747781_keyword1989095518195">entrust your account to the administrator</span> to implement some functions. For example, if you enable scheduled startup tasks, DRS will automatically entrust your account to DRS administrator <strong id="drs_01_0005__en-us_topic_0000001205747781_b1817811158142">op_svc_rds</strong> during the task creation to implement automated management on the scheduled tasks.</p>
<p id="drs_01_0005__en-us_topic_0000001205747781_en-us_topic_0000001102434640_p106272814181">Account entrustment can be implemented in the same region only.</p>
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<td class="cellrowborder" valign="top" width="40.160000000000004%" headers="mcps1.3.5.6.2.5.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p7493139719">DRS administrator</p>
<p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p6263201117419">Basic permission, which must be added when DRS is used.</p>
</td>
<td class="cellrowborder" valign="top" width="8.08%" headers="mcps1.3.5.6.2.5.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p11234558134210">System role</p>
<td class="cellrowborder" valign="top" width="8.08%" headers="mcps1.3.5.6.2.5.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p11234558134210">System-defined role</p>
</td>
<td class="cellrowborder" valign="top" width="34.71%" headers="mcps1.3.5.6.2.5.1.4 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p24932317711">Dependent on the <strong id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_b107291220426">Tenant Guest</strong>, <strong id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_b177298254213">Server Administrator</strong>, and <strong id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_b1673019224213">RDS Administrator</strong> roles.</p>
<ul id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_ul94931431476"><li id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_li134931739712"><strong id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_b1222062551510">Tenant Guest</strong>: A project-level role, which must be assigned in the same project.</li><li id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_li1849311317716"><strong id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_b109691434191517">Server Administrator</strong>: A project-level role, which must be assigned in the same project.</li><li id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_li168311457103220"><strong id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_b19896144174214">RDS Administrator</strong>: A project-level role, which must be assigned in the same project.</li></ul>
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</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p1731716542262">drs:dataBaseParams:modify</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p10317145422614">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p10317145422614">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row83175544264"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p33170549269">Updating the data processing information</p>
</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p3317135462617">drs:dataTransformation:update</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p53171554102619">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p53171554102619">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row103179548263"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p15317254122619">Adding the data processing information</p>
</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p18317145412266">drs:dataTransformation:add</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p3317145422610">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p3317145422610">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row1731705419262"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p431710548265">Deleting the data processing data</p>
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</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p1031755411266">drs:migrationJob:update</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p3317754132613">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p3317754132613">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row2031825418268"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p83181054182611">Updating the task configuration</p>
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</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p532615548264">drs:migrationJob:get</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p2326195402619">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p2326195402619">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row133261954162615"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p12327115413266">Obtaining the object-level migration comparison overview</p>
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</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p832715543269">drs:migrationJob:getSrcUsers</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p53271054112619">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p53271054112619">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row1832718542268"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p16327185418263">Obtaining the migration progress of a specified migration task</p>
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</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p933117549260">drs:migrationJob:action</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p73311054142618">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p73311054142618">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row5332354202618"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p1933255402617">Starting a task</p>
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</td>
<td class="cellrowborder" valign="top" width="34.72%" headers="mcps1.3.5.10.2.4.1.2 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p153321546262">drs:migrationJob:get</p>
</td>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p033216549264">The read permission for the corresponding instance is required. For example, if the RDS database is used, you need to configure the RDS ReadOnlyAccess permission for the project.</p>
<td class="cellrowborder" valign="top" width="37.44%" headers="mcps1.3.5.10.2.4.1.3 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p033216549264">The read permission for the corresponding instance is required. For example, if the RDS database is used, configure the RDS ReadOnlyAccess permission for the project.</p>
</td>
</tr>
<tr id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_row203320547268"><td class="cellrowborder" valign="top" width="27.839999999999996%" headers="mcps1.3.5.10.2.4.1.1 "><p id="drs_01_0201__en-us_topic_0000001229069051_en-us_topic_0000001160467836_p73321454112612">Querying task statuses</p>

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<h1 class="topictitle1">Step 1: Create a Migration Task</h1>
<div id="body0000001206795698"><div class="section" id="drs_02_0002__section41121470161527"><h4 class="sectiontitle">Process</h4><p id="drs_02_0002__p13816125811427">A complete real-time migration consists of creating a migration task, tracking task progress, analyzing migration logs, and comparing data consistency. By comparing multiple items and data, you can determine the proper time for service migration to minimize the service downtime.</p>
<p id="drs_02_0002__p912511081818">A complete migration involves the following procedures.</p>
<div class="fignone" id="drs_02_0002__fig5324659154"><span class="figcap"><b>Figure 1 </b>Migration process</span><br><span><img id="drs_02_0002__image19325759156" src="en-us_image_0000001710470900.png"></span></div>
<div class="fignone" id="drs_02_0002__fig5324659154"><span class="figcap"><b>Figure 1 </b>Migration process</span><br><span><img id="drs_02_0002__image19325759156" src="en-us_image_0000001710470900.png" title="Click to enlarge" class="imgResize"></span></div>
<ul id="drs_02_0002__ul16328143214159"><li id="drs_02_0002__li10997194194213"><a href="#drs_02_0002__section3535102285710">Step 1: Create a migration task.</a> Select the source and destination databases as required and create a migration task.</li><li id="drs_02_0002__li49975414427"><a href="drs_02_0006.html">Step 2: Check the migration progress.</a> During migration, you can view the migration progress.</li><li id="drs_02_0002__li179977415420"><a href="drs_02_0005.html">Step 3: View migration logs.</a> Migration logs contain alarms, errors, and prompt information. You can analyze system problems based on such information.</li><li id="drs_02_0002__li999794104213"><a href="drs_02_0007.html">Step 4: Compare migration items.</a> You can compare objects and data to be migrated to ensure data consistency.</li></ul>
<p id="drs_02_0002__p53065685419">This section uses the migration from MySQL to RDS MySQL as an example to describe how to configure a migration task over a VPC network on the DRS console.</p>
<p id="drs_02_0002__p13301956105413">VPC is suitable for migrations of cloud databases in the same region.</p>
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<h1 class="topictitle1">Step 4: Compare Migration Items</h1>
<div id="body0000001174487492"><p id="drs_02_0007__p11333715573">This section describes how to <span class="keyword" id="drs_02_0007__keyword114964153510">compare migration items</span> to check if there are any differences between source and destination databases. By comparing migration objects, you can determine the proper time for service migration to minimize the service downtime.</p>
<div class="fignone" id="drs_02_0007__fig204261848141112"><span class="figcap"><b>Figure 1 </b>Comparison process</span><br><span><img id="drs_02_0007__image174261148111115" src="en-us_image_0000001758549373.png"></span></div>
<div class="fignone" id="drs_02_0007__fig204261848141112"><span class="figcap"><b>Figure 1 </b>Comparison process</span><br><span><img id="drs_02_0007__image174261148111115" src="en-us_image_0000001758549373.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="section" id="drs_02_0007__section19393124916129"><h4 class="sectiontitle">Comparison Scenarios</h4><p id="drs_02_0007__p59703782111">You can compare migration objects with different dimensions:</p>
<ul id="drs_02_0007__ul11730174214215"><li id="drs_02_0007__li873111428211">Object-level comparison: It helps you compare databases, indexes, tables, views, stored procedures and functions, and sorting rules of tables. You are advised to perform the comparison after a full migration is complete.</li><li id="drs_02_0007__li188011335252">Data-level comparison is classified into row comparison and value comparison.<ul id="drs_02_0007__ul32931437162518"><li id="drs_02_0007__li51552002410">Row comparison: It helps you compare the number of rows in the tables to be migrated. This comparison method is recommended because it is fast.</li><li id="drs_02_0007__li92667062511">Value comparison: It helps you check whether data in the migrated table is consistent. The comparison process is relatively slow.</li></ul>
</li><li id="drs_02_0007__li1870619153318">Account comparison: It compares usernames and permissions of the source and destination databases.</li><li id="drs_02_0007__li1992110476534">Periodic comparison: DRS periodically compares the number of rows or objects in the source database table with those in the destination database table and displays the comparison results. To compare rows or objects periodically, enable <a href="#drs_02_0007__section1964682921119">comparison policy</a>.</li></ul>
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<ul id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_en-us_topic_0078078071_ul9762123112510"><li id="drs_02_0027__drs_04_0122_li517519468357"><strong id="drs_02_0027__drs_04_0122_b166481220144613">Yes</strong><p id="drs_02_0027__drs_04_0122_p1462275010350">You can customize the maximum DR speed.</p>
<p id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_en-us_topic_0078078071_p1383414227396">In addition, you can set the time range based on your service requirements. The traffic rate setting usually includes setting of a rate limiting time period and a traffic rate value. Flow can be controlled all day or during specific time ranges. The default value is <strong id="drs_02_0027__drs_04_0122_b1720625652016">All day</strong>. A maximum of three time ranges can be set, and they cannot overlap.</p>
<p id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_p543392816321">The flow rate must be set based on the service scenario and cannot exceed 9,999 MB/s.</p>
<div class="fignone" id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_fig218884774210"><span class="figcap"><b>Figure 2 </b>Flow control</span><br><span><img id="drs_02_0027__drs_04_0122_image143315554126" src="en-us_image_0000001710630288.png"></span></div>
<div class="fignone" id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_fig218884774210"><span class="figcap"><b>Figure 2 </b>Flow control</span><br><span><img id="drs_02_0027__drs_04_0122_image143315554126" src="en-us_image_0000001710630288.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="drs_02_0027__drs_04_0122_li8461101763611"><strong id="drs_02_0027__drs_04_0122_b16878439134614">No</strong><div class="p" id="drs_02_0027__drs_04_0122_p18586122063613">The DR speed is not limited and the outbound bandwidth of the source database is maximally used, which causes read consumption on the source database accordingly. For example, if the outbound bandwidth of the source database is 100 MB/s and 80% bandwidth is used, the I/O consumption on the source database is 80 MB/s.<div class="note" id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_note133345121551"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_ul1933411217553"><li id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_li93348121557">Flow control mode takes effect during the initial DR phase only.</li><li id="drs_02_0027__drs_04_0122_en-us_topic_0135097933_li9334171285515">You can also change the flow control mode when the task is in the <strong id="drs_02_0027__drs_04_0122_b1047210271567">Configuration</strong> state. On the <strong id="drs_02_0027__drs_04_0122_b15807914182517">Basic Information</strong> tab, In the <strong id="drs_02_0027__drs_04_0122_b9809614152518">DR Information</strong> area, click <strong id="drs_02_0027__drs_04_0122_b15810514162517">Modify</strong> next to <strong id="drs_02_0027__drs_04_0122_b18111214182510">Flow Control</strong>. In the dialog box that is displayed, change the flow control mode. The flow control mode cannot be changed for a task that is in <strong id="drs_02_0027__drs_04_0122_b1028312163258">Starting</strong> state.</li></ul>
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</div></div>
</p></li><li id="drs_03_0035__li1088085411352"><span>After the verification is successful, click <strong id="drs_03_0035__b1966041422101944">Generate Processing Rule</strong>. The rule is displayed.</span></li><li id="drs_03_0035__li118801254183513"><span>Click <strong id="drs_03_0035__b555023450">Next</strong>.</span></li></ol>
</div>
<div class="section" id="drs_03_0035__section4452318191910"><h4 class="sectiontitle">Processing Columns</h4><ol id="drs_03_0035__ol164851221151910"><li id="drs_03_0035__li348572111194"><span>On the <strong id="drs_03_0035__b196641546195511">Process Data</strong> page, select <strong id="drs_03_0035__b5719152313554">Processing Columns</strong>.</span></li><li id="drs_03_0035__li84861215199"><span>In the <strong id="drs_03_0035__b994529456">Object</strong> area, select the objects to be processed.</span><p><div class="fignone" id="drs_03_0035__fig3486421161916"><span class="figcap"><b>Figure 1 </b>Processing Columns</span><br><span><img id="drs_03_0035__image84868218191" src="en-us_image_0000001710471120.png"></span></div>
</p></li><li id="drs_03_0035__li748611213191"><span>Click <strong id="drs_03_0035__b7418848135318">Edit</strong> to the right of the selected object.</span></li><li id="drs_03_0035__li848617216193"><span>In the <strong id="drs_03_0035__b147682824517">Edit Column</strong> dialog box, select the columns to be mapped and enter new column names.</span><p><div class="fignone" id="drs_03_0035__fig1048602121914"><span class="figcap"><b>Figure 2 </b>Edit Column</span><br><span><img id="drs_03_0035__image1748611216193" src="en-us_image_0000001710630592.png"></span></div>
<div class="section" id="drs_03_0035__section4452318191910"><h4 class="sectiontitle">Processing Columns</h4><ol id="drs_03_0035__ol164851221151910"><li id="drs_03_0035__li348572111194"><span>On the <strong id="drs_03_0035__b196641546195511">Process Data</strong> page, select <strong id="drs_03_0035__b5719152313554">Processing Columns</strong>.</span></li><li id="drs_03_0035__li84861215199"><span>In the <strong id="drs_03_0035__b994529456">Object</strong> area, select the objects to be processed.</span><p><div class="fignone" id="drs_03_0035__fig3486421161916"><span class="figcap"><b>Figure 1 </b>Processing Columns</span><br><span><img id="drs_03_0035__image84868218191" src="en-us_image_0000001710471120.png" title="Click to enlarge" class="imgResize"></span></div>
</p></li><li id="drs_03_0035__li748611213191"><span>Click <strong id="drs_03_0035__b7418848135318">Edit</strong> to the right of the selected object.</span></li><li id="drs_03_0035__li848617216193"><span>In the <strong id="drs_03_0035__b147682824517">Edit Column</strong> dialog box, select the columns to be mapped and enter new column names.</span><p><div class="fignone" id="drs_03_0035__fig1048602121914"><span class="figcap"><b>Figure 2 </b>Edit Column</span><br><span><img id="drs_03_0035__image1748611216193" src="en-us_image_0000001710630592.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="note" id="drs_03_0035__note4147165873314"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="drs_03_0035__ul1414795810334"><li id="drs_03_0035__li141471158163315">You can query or filter columns or create new column names.</li><li id="drs_03_0035__li414785811332">After the column name is edited, the column name of the destination database is changed to the new name.</li><li id="drs_03_0035__li414718589333">The new column name cannot be the same as the original column name or an existing column name.</li><li id="drs_03_0035__li3148135812332">The column name in the synchronized table cannot be modified.</li><li id="drs_03_0035__li9148145820334">Only the selected columns can be synchronized.</li><li id="drs_03_0035__li122481236151718">MySQL to MySQL and MySQL to TaurusDB Cluster synchronizations do not support column mapping based on the partitioning column of a partitioned table.</li><li id="drs_03_0035__li145745518573">GaussDB partition keys cannot be filtered.</li></ul>
</div></div>
</p></li><li id="drs_03_0035__li348613213196"><span>Click <strong id="drs_03_0035__b13684335818">Confirm</strong>.</span></li><li id="drs_03_0035__li15488192111199"><span>Click <strong id="drs_03_0035__b188359451585">Next</strong>.</span></li></ol>
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<ul id="drs_03_1134__ul11811637153915"><li id="drs_03_1134__li418110376393">Task name</li><li id="drs_03_1134__li2181163733918">Description</li><li id="drs_03_1134__li11811337123919">Task start time</li></ul>
<div class="section" id="drs_03_1134__section16256919193311"><h4 class="sectiontitle">Prerequisites</h4><p id="drs_03_1134__p198941020113312">You have logged in to the DRS console.</p>
</div>
<div class="section" id="drs_03_1134__section0711639144016"><h4 class="sectiontitle">Procedure</h4><ol id="drs_03_1134__en-us_topic_0049044698_ol36506495172844"><li id="drs_03_1134__li1996848121019"><span>On the <span class="uicontrol" id="drs_03_1134__uicontrol97688013902412"><b>Disaster Recovery Management</b></span> page, click the target DR task in the <strong id="drs_03_1134__b212851648402412">Task Name/ID</strong> column.</span></li><li id="drs_03_1134__li16509857151712"><span>On the <strong id="drs_03_1134__b52030057902412">Basic Information</strong> tab, locate the information to be modified in the <strong id="drs_03_1134__b212725520402412">Task Information</strong> area.</span><p><ul id="drs_03_1134__ul11666701180"><li id="drs_03_1134__li3209162081011">You can click <span><img id="drs_03_1134__image32353167237" src="en-us_image_0000001758430181.png"></span> to modify the task name and description.<ul id="drs_03_1134__ul1765113206412"><li id="drs_03_1134__li165122018412">To submit the change, click <span><img id="drs_03_1134__image1573742415363" src="en-us_image_0000001710471092.png"></span>.</li><li id="drs_03_1134__li1565192014114">To cancel the change, click <span><img id="drs_03_1134__image148013133711" src="en-us_image_0000001758430185.png"></span>.</li></ul>
<div class="section" id="drs_03_1134__section0711639144016"><h4 class="sectiontitle">Procedure</h4><ol id="drs_03_1134__en-us_topic_0049044698_ol36506495172844"><li id="drs_03_1134__li1996848121019"><span>On the <span class="uicontrol" id="drs_03_1134__uicontrol97688013902412"><b>Disaster Recovery Management</b></span> page, click the target DR task in the <strong id="drs_03_1134__b212851648402412">Task Name/ID</strong> column.</span></li><li id="drs_03_1134__li16509857151712"><span>On the <strong id="drs_03_1134__b52030057902412">Basic Information</strong> tab, locate the information to be modified in the <strong id="drs_03_1134__b212725520402412">Task Information</strong> area.</span><p><ul id="drs_03_1134__ul11666701180"><li id="drs_03_1134__li3209162081011">You can click <span><img id="drs_03_1134__image32353167237" src="en-us_image_0000001758430181.png"></span> to modify the task name and description.<ul id="drs_03_1134__ul1765113206412"><li id="drs_03_1134__li165122018412">To submit the change, click <span><img id="drs_03_1134__image1573742415363" src="en-us_image_0000001710471092.png" title="Click to enlarge" class="imgResize"></span>.</li><li id="drs_03_1134__li1565192014114">To cancel the change, click <span><img id="drs_03_1134__image148013133711" src="en-us_image_0000001758430185.png"></span>.</li></ul>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_03_1134__table146511420114120" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Real-time DR task information</caption><thead align="left"><tr id="drs_03_1134__row265292015411"><th align="left" class="cellrowborder" valign="top" width="26.13%" id="mcps1.3.5.2.2.2.1.1.3.2.3.1.1"><p id="drs_03_1134__p1365211206413">Task Information</p>
</th>
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<ul id="drs_04_0006__ul290022872012"><li id="drs_04_0006__li4900228122014">Task name</li><li id="drs_04_0006__li15429104872012">Description</li><li id="drs_04_0006__li2220927182912">Task start time</li></ul>
<div class="section" id="drs_04_0006__section16256919193311"><h4 class="sectiontitle">Prerequisites</h4><ul id="drs_04_0006__ul268371811469"><li id="drs_04_0006__li10683111894614">You have logged in to the DRS console.</li><li id="drs_04_0006__li1876513216463">A migration task has been created.</li></ul>
</div>
<div class="section" id="drs_04_0006__section94001015141112"><h4 class="sectiontitle">Procedure</h4><ol id="drs_04_0006__en-us_topic_0049044698_ol36506495172844"><li id="drs_04_0006__li1996848121019"><span>On the <strong id="drs_04_0006__b186434444566">Online Migration Management</strong> page, click the target migration task name in the <strong id="drs_04_0006__b56431544195615">Task Name/ID</strong> column.</span></li><li id="drs_04_0006__li1778536913"><span>On the <strong id="drs_04_0006__b1135752818344">Basic Information</strong> tab, locate the information to be modified in the <strong id="drs_04_0006__b4357172883414">Task Information</strong> area.</span><p><ul id="drs_04_0006__ul102091220131019"><li id="drs_04_0006__li3209162081011">You can click <span><img id="drs_04_0006__image106592487561" src="en-us_image_0000001710470540.png"></span> to modify the task name and description.<ul id="drs_04_0006__ul226810515119"><li id="drs_04_0006__li6670101918019">To submit the change, click <span><img id="drs_04_0006__image1573742415363" src="en-us_image_0000001710630012.png"></span>.</li><li id="drs_04_0006__li202681159115">To cancel the change, click <span><img id="drs_04_0006__image148013133711" src="en-us_image_0000001758429613.png"></span>.</li></ul>
<div class="section" id="drs_04_0006__section94001015141112"><h4 class="sectiontitle">Procedure</h4><ol id="drs_04_0006__en-us_topic_0049044698_ol36506495172844"><li id="drs_04_0006__li1996848121019"><span>On the <strong id="drs_04_0006__b186434444566">Online Migration Management</strong> page, click the target migration task name in the <strong id="drs_04_0006__b56431544195615">Task Name/ID</strong> column.</span></li><li id="drs_04_0006__li1778536913"><span>On the <strong id="drs_04_0006__b1135752818344">Basic Information</strong> tab, locate the information to be modified in the <strong id="drs_04_0006__b4357172883414">Task Information</strong> area.</span><p><ul id="drs_04_0006__ul102091220131019"><li id="drs_04_0006__li3209162081011">You can click <span><img id="drs_04_0006__image106592487561" src="en-us_image_0000001710470540.png"></span> to modify the task name and description.<ul id="drs_04_0006__ul226810515119"><li id="drs_04_0006__li6670101918019">To submit the change, click <span><img id="drs_04_0006__image1573742415363" src="en-us_image_0000001710630012.png" title="Click to enlarge" class="imgResize"></span>.</li><li id="drs_04_0006__li202681159115">To cancel the change, click <span><img id="drs_04_0006__image148013133711" src="en-us_image_0000001758429613.png"></span>.</li></ul>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_04_0006__table11403142202410" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Task information</caption><thead align="left"><tr id="drs_04_0006__row17404132212417"><th align="left" class="cellrowborder" valign="top" width="26.13%" id="mcps1.3.5.2.2.2.1.1.3.2.3.1.1"><p id="drs_04_0006__p15404192292420">Task Information</p>
</th>
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<h1 class="topictitle1">How Do I Ensure that All Services on the Database Are Stopped?</h1>
<div id="body8662426"><p id="drs_04_0020__en-us_topic_0000001160307870_p146828490437">To ensure that all services on the database are stopped, perform the following steps:</p>
<ol id="drs_04_0020__en-us_topic_0000001160307870_ol1592828141017"><li id="drs_04_0020__en-us_topic_0000001160307870_li199284881017"><span>Run the following statement on the source database to check whether active connections exist:</span><p><pre class="codeblock" id="drs_04_0020__en-us_topic_0000001160307870_codeblock9660165784015">show processlist;</pre>
<div class="fignone" id="drs_04_0020__en-us_topic_0000001160307870_fig1166302975716"><span class="figcap"><b>Figure 1 </b>Checking active connections</span><br><span><img id="drs_04_0020__en-us_topic_0000001160307870_image156637293574" src="en-us_image_0000001758429757.png"></span></div>
<div class="fignone" id="drs_04_0020__en-us_topic_0000001160307870_fig1166302975716"><span class="figcap"><b>Figure 1 </b>Checking active connections</span><br><span><img id="drs_04_0020__en-us_topic_0000001160307870_image156637293574" src="en-us_image_0000001758429757.png" title="Click to enlarge" class="imgResize"></span></div>
</p></li><li id="drs_04_0020__en-us_topic_0000001160307870_li1918692395914"><strong>Optional: </strong><span>If there are active connections, locate the service processes based on the values in the <strong id="drs_04_0020__en-us_topic_0000001160307870_b1289023316459">Host</strong> column in the command output and stop the service processes.</span></li><li id="drs_04_0020__en-us_topic_0000001160307870_li6896418171013"><span>Run the following statement in the source database to check the binlog position. Then, record the two values in the <strong id="drs_04_0020__en-us_topic_0000001160307870_b7533258135811">file</strong> and <strong id="drs_04_0020__en-us_topic_0000001160307870_b1728474135919">position</strong> columns as <strong id="drs_04_0020__en-us_topic_0000001160307870_b1777946195315">ckpt1</strong>:</span><p><pre class="codeblock" id="drs_04_0020__en-us_topic_0000001160307870_codeblock113013219581">show master status;</pre>
<div class="fignone" id="drs_04_0020__en-us_topic_0000001160307870_fig31414917597"><span class="figcap"><b>Figure 2 </b>Viewing the binlog position</span><br><span><img id="drs_04_0020__en-us_topic_0000001160307870_image2142497597" src="en-us_image_0000001758549585.png"></span></div>
<div class="fignone" id="drs_04_0020__en-us_topic_0000001160307870_fig31414917597"><span class="figcap"><b>Figure 2 </b>Viewing the binlog position</span><br><span><img id="drs_04_0020__en-us_topic_0000001160307870_image2142497597" src="en-us_image_0000001758549585.png" title="Click to enlarge" class="imgResize"></span></div>
</p></li><li id="drs_04_0020__en-us_topic_0000001160307870_li3220131011241"><span>Wait for more than 30s. Run the following statement in the source database to check the binlog position again. Then, record the two values in the <strong id="drs_04_0020__en-us_topic_0000001160307870_b6680104510596">file</strong> and <strong id="drs_04_0020__en-us_topic_0000001160307870_b146800454598">position</strong> columns as <strong id="drs_04_0020__en-us_topic_0000001160307870_b176807450597">ckpt2</strong>. If <strong id="drs_04_0020__en-us_topic_0000001160307870_b65811947115518">ckpt1</strong> and <strong id="drs_04_0020__en-us_topic_0000001160307870_b98898498551">ckpt2</strong> are equal, no data is written to the source database.</span><p><pre class="codeblock" id="drs_04_0020__en-us_topic_0000001160307870_codeblock5288823717">show master status;</pre>
</p></li></ol>
<p id="drs_04_0020__en-us_topic_0000001160307870_p8060118"></p>
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<ul id="drs_04_0122__en-us_topic_0135097933_en-us_topic_0078078071_ul9762123112510"><li id="drs_04_0122__li517519468357"><strong id="drs_04_0122__b166481220144613">Yes</strong><p id="drs_04_0122__p1462275010350">You can customize the maximum DR speed.</p>
<p id="drs_04_0122__en-us_topic_0135097933_en-us_topic_0078078071_p1383414227396">In addition, you can set the time range based on your service requirements. The traffic rate setting usually includes setting of a rate limiting time period and a traffic rate value. Flow can be controlled all day or during specific time ranges. The default value is <strong id="drs_04_0122__b1720625652016">All day</strong>. A maximum of three time ranges can be set, and they cannot overlap.</p>
<p id="drs_04_0122__en-us_topic_0135097933_p543392816321">The flow rate must be set based on the service scenario and cannot exceed 9,999 MB/s.</p>
<div class="fignone" id="drs_04_0122__en-us_topic_0135097933_fig218884774210"><span class="figcap"><b>Figure 1 </b>Flow control</span><br><span><img id="drs_04_0122__image143315554126" src="en-us_image_0000001710630288.png"></span></div>
<div class="fignone" id="drs_04_0122__en-us_topic_0135097933_fig218884774210"><span class="figcap"><b>Figure 1 </b>Flow control</span><br><span><img id="drs_04_0122__image143315554126" src="en-us_image_0000001710630288.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="drs_04_0122__li8461101763611"><strong id="drs_04_0122__b16878439134614">No</strong><div class="p" id="drs_04_0122__p18586122063613">The DR speed is not limited and the outbound bandwidth of the source database is maximally used, which causes read consumption on the source database accordingly. For example, if the outbound bandwidth of the source database is 100 MB/s and 80% bandwidth is used, the I/O consumption on the source database is 80 MB/s.<div class="note" id="drs_04_0122__en-us_topic_0135097933_note133345121551"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="drs_04_0122__en-us_topic_0135097933_ul1933411217553"><li id="drs_04_0122__en-us_topic_0135097933_li93348121557">Flow control mode takes effect during the initial DR phase only.</li><li id="drs_04_0122__en-us_topic_0135097933_li9334171285515">You can also change the flow control mode when the task is in the <strong id="drs_04_0122__b1047210271567">Configuration</strong> state. On the <strong id="drs_04_0122__b15807914182517">Basic Information</strong> tab, In the <strong id="drs_04_0122__b9809614152518">DR Information</strong> area, click <strong id="drs_04_0122__b15810514162517">Modify</strong> next to <strong id="drs_04_0122__b18111214182510">Flow Control</strong>. In the dialog box that is displayed, change the flow control mode. The flow control mode cannot be changed for a task that is in <strong id="drs_04_0122__b1028312163258">Starting</strong> state.</li></ul>
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<ul id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_en-us_topic_0078078071_ul9762123112510"><li id="drs_04_0123__drs_04_0122_li517519468357"><strong id="drs_04_0123__drs_04_0122_b166481220144613">Yes</strong><p id="drs_04_0123__drs_04_0122_p1462275010350">You can customize the maximum DR speed.</p>
<p id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_en-us_topic_0078078071_p1383414227396">In addition, you can set the time range based on your service requirements. The traffic rate setting usually includes setting of a rate limiting time period and a traffic rate value. Flow can be controlled all day or during specific time ranges. The default value is <strong id="drs_04_0123__drs_04_0122_b1720625652016">All day</strong>. A maximum of three time ranges can be set, and they cannot overlap.</p>
<p id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_p543392816321">The flow rate must be set based on the service scenario and cannot exceed 9,999 MB/s.</p>
<div class="fignone" id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_fig218884774210"><span class="figcap"><b>Figure 1 </b>Flow control</span><br><span><img id="drs_04_0123__drs_04_0122_image143315554126" src="en-us_image_0000001710630288.png"></span></div>
<div class="fignone" id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_fig218884774210"><span class="figcap"><b>Figure 1 </b>Flow control</span><br><span><img id="drs_04_0123__drs_04_0122_image143315554126" src="en-us_image_0000001710630288.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="drs_04_0123__drs_04_0122_li8461101763611"><strong id="drs_04_0123__drs_04_0122_b16878439134614">No</strong><div class="p" id="drs_04_0123__drs_04_0122_p18586122063613">The DR speed is not limited and the outbound bandwidth of the source database is maximally used, which causes read consumption on the source database accordingly. For example, if the outbound bandwidth of the source database is 100 MB/s and 80% bandwidth is used, the I/O consumption on the source database is 80 MB/s.<div class="note" id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_note133345121551"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_ul1933411217553"><li id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_li93348121557">Flow control mode takes effect during the initial DR phase only.</li><li id="drs_04_0123__drs_04_0122_en-us_topic_0135097933_li9334171285515">You can also change the flow control mode when the task is in the <strong id="drs_04_0123__drs_04_0122_b1047210271567">Configuration</strong> state. On the <strong id="drs_04_0123__drs_04_0122_b15807914182517">Basic Information</strong> tab, In the <strong id="drs_04_0123__drs_04_0122_b9809614152518">DR Information</strong> area, click <strong id="drs_04_0123__drs_04_0122_b15810514162517">Modify</strong> next to <strong id="drs_04_0123__drs_04_0122_b18111214182510">Flow Control</strong>. In the dialog box that is displayed, change the flow control mode. The flow control mode cannot be changed for a task that is in <strong id="drs_04_0123__drs_04_0122_b1028312163258">Starting</strong> state.</li></ul>
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<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="drs_04_0128.html">From MySQL to Kafka</a></strong><br>
<li class="ulchildlink"><strong><a href="drs_03_1118.html">From MySQL to MySQL</a></strong><br>
</li>
</ul>

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@ -19,7 +19,7 @@ AND SP.name NOT LIKE '##%##'
AND SP.name NOT LIKE 'NT AUTHORITY%'
AND SP.name NOT LIKE 'NT SERVICE%'
AND SP.name NOT IN ('rdsadmin','rdsbackup','rdsuser','rdsmirror','public')</pre>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518"><a name="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518"></a><a name="en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518"></a><span>Execute the script in <a href="#drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li165582910512">1</a>:</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig6837143945419"><span class="figcap"><b>Figure 1 </b>Obtaining the script</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image15837173913542" src="en-us_image_0000001710471044.jpg"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518"><a name="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518"></a><a name="en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518"></a><span>Execute the script in <a href="#drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li165582910512">1</a>:</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig6837143945419"><span class="figcap"><b>Figure 1 </b>Obtaining the script</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image15837173913542" src="en-us_image_0000001710471044.jpg" title="Click to enlarge" class="imgResize"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li847655812542"><span>Copy and execute the script obtain in <a href="#drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li189242430518">2</a> on the destination instance. The created Login account is the same as the original one.</span></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li9966117165516"><span>Map the newly created Login account to the database user permissions that have been migrated to the RDS SQL Server DB instance to ensure permission consistency.</span><p><pre class="codeblock" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_codeblock8798491572">declare @DBName nvarchar(200)
declare @Login_name nvarchar(200)
declare @SQL nvarchar(MAX)
@ -50,7 +50,7 @@ deallocate DBName_Cursor</pre>
<div class="section" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_section52071439115917"><h4 class="sectiontitle">Database Link</h4><p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p1963513251475">SQL Server allows you to create database links to interact with databases on external DB instances. Therefore you can query, synchronize, and compare databases of different types or on different DB instances. However, these links cannot be automatically synchronized to the DB instance on cloud so you need to synchronize them manually.</p>
</div>
<ol id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_ol195745142015"><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li657414144119"><span>Connect the local DB instance and cloud DB instance through Microsoft SQL Server Management Studio. Choose <span class="menucascade" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_menucascade203455315112"><b><span class="uicontrol" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_uicontrol1934453314">Server Objects</span></b> &gt; <b><span class="uicontrol" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_uicontrol193051471927">Linked Servers</span></b></span> and locate the DBLink of the current DB instance.</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig884815171441"><span class="figcap"><b>Figure 2 </b>Viewing database links</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image3848101716413" src="en-us_image_0000001710630532.jpg"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li143671111952"><span>Select the linked server and press <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b646717132133">F7</strong>. The <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b169315319191">Object Explore</strong> page is displayed. On this page, you can quickly create a script.</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig84063271710"><span class="figcap"><b>Figure 3 </b>Creating the script</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image204071273715" src="en-us_image_0000001758430137.jpg"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li143671111952"><span>Select the linked server and press <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b646717132133">F7</strong>. The <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b169315319191">Object Explore</strong> page is displayed. On this page, you can quickly create a script.</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig84063271710"><span class="figcap"><b>Figure 3 </b>Creating the script</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image204071273715" src="en-us_image_0000001758430137.jpg" title="Click to enlarge" class="imgResize"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li685731419818"><span>In the displayed window, view all the scripts for creating DBLinks of the current DB instance. You only need to copy the scripts to the destination DB instance and change the password on @rmtpassword.</span><p><pre class="codeblock" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_codeblock133905561685">USE [master]
GO
@ -65,7 +65,7 @@ GO</pre>
<div class="section" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_section17559155318126"><h4 class="sectiontitle">Agent JOB</h4><p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p13635122518478">Agent Job is the agent service of Microsoft SQL Server. It helps you quickly create scheduled tasks on DB instances, perform routine O&amp;M, and process data. You need to manually migrate local Job scripts.</p>
</div>
<ol id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_ol1746314041320"><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li1246364019137"><span>Connect the local DB instance and cloud DB instance through Microsoft SQL Server Management Studio. Choose <span class="menucascade" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_menucascade1883610152512"><b><span class="uicontrol" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_uicontrol148291011255">SQL Server Agent</span></b> &gt; <b><span class="uicontrol" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_uicontrol19821010122516">Jobs</span></b></span> and locate all the jobs of the current DB instance.</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig6899153841518"><span class="figcap"><b>Figure 4 </b>Viewing Jobs</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image138991438101519" src="en-us_image_0000001710630536.jpg"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li85516110164"><span>Select a job and press <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b161191717192610">F7</strong>. All jobs are displayed on the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1688117482263">Object Explore</strong> page. Select all jobs and create a script in the new window.</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig85571036111918"><span class="figcap"><b>Figure 5 </b>Creating a script</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image19558163618197" src="en-us_image_0000001710471040.jpg"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li85516110164"><span>Select a job and press <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b161191717192610">F7</strong>. All jobs are displayed on the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1688117482263">Object Explore</strong> page. Select all jobs and create a script in the new window.</span><p><div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig85571036111918"><span class="figcap"><b>Figure 5 </b>Creating a script</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image19558163618197" src="en-us_image_0000001710471040.jpg" title="Click to enlarge" class="imgResize"></span></div>
</p></li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li133461179204"><span>Copy the T-SQL script in the new window to the new DB instance, and then modify the following key items to ensure that the creation is successful.</span><p><ul id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_ul18582349162013"><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li13956192119222">Modify the owner account of each job.<p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p184781529142211"><a name="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li13956192119222"></a><a name="en-us_topic_0000001205509265_en-us_topic_0176256301_li13956192119222"></a>Example:</p>
<p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p139512322211">@owner_login_name=N'rdsuser'</p>
</li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li14492173392111">Modify the DB instance name of each job.<p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p5560193414214"><a name="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li14492173392111"></a><a name="en-us_topic_0000001205509265_en-us_topic_0176256301_li14492173392111"></a>Example:</p>
@ -95,7 +95,7 @@ ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdb6', FILENAME = N'D:\RDSDBDATA\
GO
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdb7', FILENAME = N'D:\RDSDBDATA\Temp\tempdb7.ndf' , SIZE = 65536KB , FILEGROWTH = 65536KB )
GO</pre>
<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig958914148421"><span class="figcap"><b>Figure 6 </b>Checking temporary files</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image6589141414426" src="en-us_image_0000001710471048.jpg"></span></div>
<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig958914148421"><span class="figcap"><b>Figure 6 </b>Checking temporary files</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image6589141414426" src="en-us_image_0000001710471048.jpg" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li102445532421">Database isolation level: Check whether the database isolation level is enabled on the source DB instance and synchronize the isolation level to the RDS SQL Server DB instance. There are two snapshot isolation parameters:<ul id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_ul1914971644317"><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li1314920165436">Is Read Committed Snapshot On</li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li3617141824316">Allow Snapshot Isolation</li></ul>
<p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p156890161977">If the database isolation level of the source DB instance is enabled, you can run the following script on the destination database to enable the database isolation level:</p>
<pre class="codeblock" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_codeblock2081301817425">USE [DBName]
@ -105,11 +105,11 @@ GO
ALTER DATABASE [DBName] SET ALLOW_SNAPSHOT_ISOLATION ON
GO</pre>
</li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li7915526144314">Max Degree of Parallelism: The maximum degree of parallelism is set to <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1879884519301">0</strong> by default on the RDS SQL Server instance. You can also set the value based on the local settings to avoid exceptions in different service scenarios.<p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p96367258475">In <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b14115104932917">Object Explorer</strong>, right-click a local server and select <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b764311547294">Properties</strong>. Click the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b16503858142910">Advanced</strong> node. In the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b579912113012">Max Degree of Parallelism</strong> box, view the value of the local instance and change the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b10943134311332">max degree of parallelism</strong> value in the parameter group of the destination RDS SQL Server instance to the same.</p>
<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig359115393442"><span class="figcap"><b>Figure 7 </b>Max Degree of Parallelism</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image4591739104413" src="en-us_image_0000001758430141.jpg"></span></div>
<div class="p" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p1221114296458">Log in to the RDS console. On the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1275911514134">Instance Management</strong> page, click the target DB instance name. Choose <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b9320143112448">Parameters</strong>, search for the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1349416234519">max degree of parallelism</strong> parameter, and change its value.<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig833718335366"><span class="figcap"><b>Figure 8 </b>max degree of parallelism</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image1033793318364" src="en-us_image_0000001758549965.png"></span></div>
<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig359115393442"><span class="figcap"><b>Figure 7 </b>Max Degree of Parallelism</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image4591739104413" src="en-us_image_0000001758430141.jpg" title="Click to enlarge" class="imgResize"></span></div>
<div class="p" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p1221114296458">Log in to the RDS console. On the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1275911514134">Instance Management</strong> page, click the target DB instance name. Choose <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b9320143112448">Parameters</strong>, search for the <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1349416234519">max degree of parallelism</strong> parameter, and change its value.<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig833718335366"><span class="figcap"><b>Figure 8 </b>max degree of parallelism</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image1033793318364" src="en-us_image_0000001758549965.png" title="Click to enlarge" class="imgResize"></span></div>
</div>
</li><li id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_li936664485316">Check whether the database recovery model on the cloud is set to <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1960733719497">Full</strong>. If not, change the mode.<p id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_p11636725164720">Right-click the database and choose <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b13838145419496">Properties</strong> from the shortcut menu. In the displayed page, select <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b7481344507">Options</strong>. Then, verify that <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b27006387507">Recovery Model</strong> is set to <strong id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_b1361720463508">Full</strong>. Ensure that the database is highly available and the backup policy is executable.</p>
<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig62811724572"><span class="figcap"><b>Figure 9 </b>Checking the database recovery model</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image1028282115715" src="en-us_image_0000001758430133.png"></span></div>
<div class="fignone" id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_fig62811724572"><span class="figcap"><b>Figure 9 </b>Checking the database recovery model</span><br><span><img id="drs_04_0458__en-us_topic_0000001205509265_en-us_topic_0176256301_image1028282115715" src="en-us_image_0000001758430133.png" title="Click to enlarge" class="imgResize"></span></div>
</li></ol>
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</li>
<li class="ulchildlink"><strong><a href="drs_10_0412.html">Restarting a Synchronization Task</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="drs_06_0010.html">Changing a Single-AZ Task to a Dual-AZ Task</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="drs_11_0462.html">Cloning a Synchronization Task</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="drs_10_0013.html">Stopping a Synchronization Task</a></strong><br>

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<h1 class="topictitle1">Kafka Authentication</h1>
<div id="body0000001224125028"><div class="section" id="drs_05_0018__section42450379218"><h4 class="sectiontitle">PLAINTEXT</h4><p id="drs_05_0018__p299315543169">No security authentication mode is available. You only need to enter the IP address and port for connection.</p>
<div class="fignone" id="drs_05_0018__fig1913418271147"><span class="figcap"><b>Figure 1 </b>PLAINTEXT</span><br><span><img id="drs_05_0018__image125314309341" src="en-us_image_0000001710630028.png"></span></div>
<div class="fignone" id="drs_05_0018__fig1913418271147"><span class="figcap"><b>Figure 1 </b>PLAINTEXT</span><br><span><img id="drs_05_0018__image125314309341" src="en-us_image_0000001710630028.png" title="Click to enlarge" class="imgResize"></span></div>
</div>
<div class="section" id="drs_05_0018__section14347513434"><a name="drs_05_0018__section14347513434"></a><a name="section14347513434"></a><h4 class="sectiontitle">SASL_PLAINTEXT</h4><p id="drs_05_0018__p18620421121414">The SASL mechanism is used to connect to Kafka, and you need to configure SASL parameters.</p>
<div class="fignone" id="drs_05_0018__fig1031719281296"><span class="figcap"><b>Figure 2 </b>SASL_PLAINTEXT</span><br><span><img id="drs_05_0018__image9497195073519" src="en-us_image_0000001758429637.png"></span></div>
<div class="fignone" id="drs_05_0018__fig1031719281296"><span class="figcap"><b>Figure 2 </b>SASL_PLAINTEXT</span><br><span><img id="drs_05_0018__image9497195073519" src="en-us_image_0000001758429637.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_05_0018__table8940103332711" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameter settings</caption><thead align="left"><tr id="drs_05_0018__row4941033172711"><th align="left" class="cellrowborder" valign="top" width="30%" id="mcps1.3.2.4.2.3.1.1"><p id="drs_05_0018__p2872185914232">Parameter</p>
</th>
@ -39,7 +39,7 @@
</div>
</div>
<div class="section" id="drs_05_0018__section83072273310"><a name="drs_05_0018__section83072273310"></a><a name="section83072273310"></a><h4 class="sectiontitle">SSL</h4><p id="drs_05_0018__p1191727191712">SSL is used to encrypt the connection to Kafka. Related parameters need to be configured.</p>
<div class="fignone" id="drs_05_0018__fig6889181211715"><span class="figcap"><b>Figure 3 </b>SSL</span><br><span><img id="drs_05_0018__image1997114523717" src="en-us_image_0000001758549461.png"></span></div>
<div class="fignone" id="drs_05_0018__fig6889181211715"><span class="figcap"><b>Figure 3 </b>SSL</span><br><span><img id="drs_05_0018__image1997114523717" src="en-us_image_0000001758549461.png" title="Click to enlarge" class="imgResize"></span></div>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_05_0018__table231424184816" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Parameter settings</caption><thead align="left"><tr id="drs_05_0018__row23112414818"><th align="left" class="cellrowborder" valign="top" width="30%" id="mcps1.3.3.4.2.3.1.1"><p id="drs_05_0018__p153122411486">Parameter</p>
</th>
@ -87,7 +87,7 @@
</div>
</div>
<div class="section" id="drs_05_0018__section1688914413315"><h4 class="sectiontitle">SASL_SSL</h4><p id="drs_05_0018__p1886110498147">If the SASL and SSL are used, configure SSL and SASL parameters. For details, see <a href="#drs_05_0018__section14347513434">SASL_PLAINTEXT</a> and <a href="#drs_05_0018__section83072273310">SSL</a>.</p>
<div class="fignone" id="drs_05_0018__fig1121644391815"><span class="figcap"><b>Figure 4 </b>SASL_SSL</span><br><span><img id="drs_05_0018__image14643184633910" src="en-us_image_0000001758549465.png"></span></div>
<div class="fignone" id="drs_05_0018__fig1121644391815"><span class="figcap"><b>Figure 4 </b>SASL_SSL</span><br><span><img id="drs_05_0018__image14643184633910" src="en-us_image_0000001758549465.png" title="Click to enlarge" class="imgResize"></span></div>
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<a name="drs_06_0010"></a><a name="drs_06_0010"></a>
<h1 class="topictitle1">Changing a Single-AZ Task to a Dual-AZ Task</h1>
<div id="body8662426"><p id="drs_06_0010__en-us_topic_0000001918682606_p8060118">DRS allows you to change a single-AZ task to a dual-AZ task, improving task reliability while remaining the original task.</p>
<div class="section" id="drs_06_0010__en-us_topic_0000001918682606_section942054813374"><h4 class="sectiontitle">Constraints</h4><ul id="drs_06_0010__en-us_topic_0000001918682606_ul183671656387"><li id="drs_06_0010__en-us_topic_0000001918682606_li13367105103814">A dual-AZ task cannot be changed to a single-AZ task.</li><li id="drs_06_0010__en-us_topic_0000001918682606_li85921422386">Only tasks in the <strong id="drs_06_0010__en-us_topic_0000001918682606_b158243181309">Incremental</strong> or <strong id="drs_06_0010__en-us_topic_0000001918682606_b656013237012">Incremental failed</strong> state can be changed.</li><li id="drs_06_0010__en-us_topic_0000001918682606_li5119203764010">Only synchronization tasks from <span id="drs_06_0010__en-us_topic_0000001918682606_text1367743040">GaussDB Centralized</span> to Kafka can be changed.</li></ul>
</div>
<div class="section" id="drs_06_0010__en-us_topic_0000001918682606_section956602704313"><h4 class="sectiontitle">Procedure</h4><ol id="drs_06_0010__en-us_topic_0000001918682606_ol1179354419432"><li id="drs_06_0010__en-us_topic_0000001918682606_en-us_topic_0000001461712437_li8466193425411"><span>Log in to the management console.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_en-us_topic_0000001461712437_li146611344546"><span>Click <span><img id="drs_06_0010__en-us_topic_0000001918682606_en-us_topic_0000001461712437_image1846623405415" src="en-us_image_0000001918683154.png"></span> in the upper left corner and select a region and project.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_en-us_topic_0000001461712437_li8466163417549"><span>Choose <strong id="drs_06_0010__en-us_topic_0000001918682606_b117218221729">Databases</strong> &gt; <strong id="drs_06_0010__en-us_topic_0000001918682606_b47320227215">Data Replication Service</strong>. The <strong id="drs_06_0010__en-us_topic_0000001918682606_b84641525229">Data Replication Service</strong> page is displayed.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_li3389103916403"><span>On the <strong id="drs_06_0010__en-us_topic_0000001918682606_b134541127113713">Data Synchronization Management</strong> page, select the target task and choose <strong id="drs_06_0010__en-us_topic_0000001918682606_b19454227193713">More</strong> &gt; <strong id="drs_06_0010__en-us_topic_0000001918682606_b19454827133718">Change to Primary/Standby</strong> in the <strong id="drs_06_0010__en-us_topic_0000001918682606_b5455192793715">Operation</strong> column.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_li759081653213"><span>On the displayed page, select the standby AZ. If the task is over a public network, you need to specify the EIP of the standby task and click <span class="uicontrol" id="drs_06_0010__en-us_topic_0000001918682606_uicontrol195581011124019"><b>OK</b></span>.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_li297110244216"><span>After submitting the change, click <span class="uicontrol" id="drs_06_0010__en-us_topic_0000001918682606_uicontrol1342543332215"><b>Back to Task List</b></span>. On the <strong id="drs_06_0010__en-us_topic_0000001918682606_b1342643314220">Data Synchronization Management</strong> page, the task status is <strong id="drs_06_0010__en-us_topic_0000001918682606_b14426193332216">Changing to primary/standby</strong>. After the task is changed, you can see that the parent task contains one primary and one standby subtask. The standby subtask and the parent task are in the <strong id="drs_06_0010__en-us_topic_0000001918682606_b17437631413">Configuration</strong> state.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_li125778301321"><span>Click <strong id="drs_06_0010__en-us_topic_0000001918682606_b42948518172">Edit</strong> in the <strong id="drs_06_0010__en-us_topic_0000001918682606_b63464555173">Operation</strong> column of the parent task. On the displayed page, test the connections to the source and destination databases. If the connections are normal, click <strong id="drs_06_0010__en-us_topic_0000001918682606_b1792034181812">Next</strong>.</span></li><li id="drs_06_0010__en-us_topic_0000001918682606_li1468081991"><span>On the <strong id="drs_06_0010__en-us_topic_0000001918682606_b881422820197">Confirm Task</strong> page, click <strong id="drs_06_0010__en-us_topic_0000001918682606_b178752032181915">Start Task</strong>. If the task is billed on a yearly/monthly basis, click <strong id="drs_06_0010__en-us_topic_0000001918682606_b10196131002114">Pay and Start</strong> to go to the payment page.</span></li></ol>
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</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="drs_05_0006.html">Task Life Cycle</a></div>
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<ul id="drs_10_0004__ul11811637153915"><li id="drs_10_0004__li418110376393">Task name</li><li id="drs_10_0004__li2181163733918">Description</li><li id="drs_10_0004__li11811337123919">Task start time</li></ul>
<div class="section" id="drs_10_0004__section16256919193311"><h4 class="sectiontitle">Prerequisites</h4><p id="drs_10_0004__p198941020113312">You have logged in to the DRS console.</p>
</div>
<div class="section" id="drs_10_0004__section226719265595"><h4 class="sectiontitle">Procedure</h4><ol id="drs_10_0004__en-us_topic_0049044698_ol36506495172844"><li id="drs_10_0004__li1996848121019"><span>On the <strong id="drs_10_0004__b117163711014">Data Synchronization Management</strong> page, click the target synchronization task name in the <strong id="drs_10_0004__b2171037201010">Task Name/ID</strong> column.</span></li><li id="drs_10_0004__li16509857151712"><span>On the <strong id="drs_10_0004__b282023765512">Basic Information</strong> tab, locate the information to be modified in the <strong id="drs_10_0004__b38211837155517">Task Information</strong> area.</span><p><ul id="drs_10_0004__ul11666701180"><li id="drs_10_0004__li3209162081011">You can click <span><img id="drs_10_0004__image1822312403102" src="en-us_image_0000001758430081.png"></span> to modify the task name and description.<ul id="drs_10_0004__ul1765113206412"><li id="drs_10_0004__li165122018412">To submit the change, click <span><img id="drs_10_0004__image1573742415363" src="en-us_image_0000001710470992.png"></span>.</li><li id="drs_10_0004__li1565192014114">To cancel the change, click <span><img id="drs_10_0004__image148013133711" src="en-us_image_0000001710470984.png"></span>.</li></ul>
<div class="section" id="drs_10_0004__section226719265595"><h4 class="sectiontitle">Procedure</h4><ol id="drs_10_0004__en-us_topic_0049044698_ol36506495172844"><li id="drs_10_0004__li1996848121019"><span>On the <strong id="drs_10_0004__b117163711014">Data Synchronization Management</strong> page, click the target synchronization task name in the <strong id="drs_10_0004__b2171037201010">Task Name/ID</strong> column.</span></li><li id="drs_10_0004__li16509857151712"><span>On the <strong id="drs_10_0004__b282023765512">Basic Information</strong> tab, locate the information to be modified in the <strong id="drs_10_0004__b38211837155517">Task Information</strong> area.</span><p><ul id="drs_10_0004__ul11666701180"><li id="drs_10_0004__li3209162081011">You can click <span><img id="drs_10_0004__image1822312403102" src="en-us_image_0000001758430081.png"></span> to modify the task name and description.<ul id="drs_10_0004__ul1765113206412"><li id="drs_10_0004__li165122018412">To submit the change, click <span><img id="drs_10_0004__image1573742415363" src="en-us_image_0000001710470992.png" title="Click to enlarge" class="imgResize"></span>.</li><li id="drs_10_0004__li1565192014114">To cancel the change, click <span><img id="drs_10_0004__image148013133711" src="en-us_image_0000001710470984.png"></span>.</li></ul>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_10_0004__table146511420114120" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Task information</caption><thead align="left"><tr id="drs_10_0004__row265292015411"><th align="left" class="cellrowborder" valign="top" width="26.13%" id="mcps1.3.5.2.2.2.1.1.3.2.3.1.1"><p id="drs_10_0004__p1365211206413">Task Information</p>
</th>
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<h1 class="topictitle1">Restarting a Synchronization Task</h1>
<div id="body0000002200968588"><p id="drs_10_0412__p195811622311">DRS allows you to restart a synchronization task after task parameters are changed in <a href="drs_10_0410.html">Changing Task Parameters</a>.</p>
<div class="section" id="drs_10_0412__section24311659823"><h4 class="sectiontitle">Constraints</h4><ul id="drs_10_0412__ul1819918517319"><li id="drs_10_0412__li282711569311">Tasks in the <strong id="drs_10_0412__b1361610420128">Full</strong>, <strong id="drs_10_0412__b361714414121">Full synchronization failed</strong>, <strong id="drs_10_0412__b10617249126">Incremental</strong>, or <strong id="drs_10_0412__b461774191213">Incremental synchronization failed</strong> state can be restarted.</li><li id="drs_10_0412__li19199259311">Only the synchronization tasks of the following engines can be restarted:<ul id="drs_10_0412__ul14782421203518"><li id="drs_10_0412__li76655191351">MySQL-&gt;MySQL</li><li id="drs_10_0412__li680333318364">MySQL-&gt;PostgreSQL</li><li id="drs_10_0412__li1580463373612">MySQL -&gt; GaussDB Distributed</li><li id="drs_10_0412__li11804143303618">MySQL -&gt; <span id="drs_10_0412__text17752201114558">GaussDB Centralized</span></li><li id="drs_10_0412__li88053331362">MySQL-&gt;<span id="drs_10_0412__text1824821956">TaurusDB</span></li><li id="drs_10_0412__li188051433173615">MySQL-&gt;Kafka</li><li id="drs_10_0412__li1980533317363">MySQL-&gt;CSS/ES</li><li id="drs_10_0412__li18056332360">MySQL-&gt;Oracle</li></ul>
<div class="section" id="drs_10_0412__section24311659823"><h4 class="sectiontitle">Constraints</h4><ul id="drs_10_0412__ul1819918517319"><li id="drs_10_0412__li282711569311">Tasks in the <strong id="drs_10_0412__b1361610420128">Full</strong>, <strong id="drs_10_0412__b361714414121">Full synchronization failed</strong>, <strong id="drs_10_0412__b10617249126">Incremental</strong>, or <strong id="drs_10_0412__b461774191213">Incremental synchronization failed</strong> state can be restarted.</li><li id="drs_10_0412__li19199259311">Only the synchronization tasks of the following engines can be restarted:<ul id="drs_10_0412__ul14782421203518"><li id="drs_10_0412__li76655191351">MySQL-&gt;MySQL</li><li id="drs_10_0412__li1580463373612">MySQL -&gt; GaussDB Distributed</li><li id="drs_10_0412__li88053331362">MySQL-&gt;<span id="drs_10_0412__text1824821956">TaurusDB</span></li><li id="drs_10_0412__li188051433173615">MySQL-&gt;Kafka</li></ul>
</li></ul>
</div>
<div class="section" id="drs_10_0412__section1591105633718"><h4 class="sectiontitle">Method 1</h4><ol id="drs_10_0412__ol368020618525"><li id="drs_10_0412__li12630161414526"><span>In the task list on the <span class="uicontrol" id="drs_10_0412__uicontrol1099672517139"><b>Data Synchronization Management</b></span> page, locate the target task and click <span class="uicontrol" id="drs_10_0412__uicontrol1599692515136"><b>Restart</b></span> in the <strong id="drs_10_0412__b1996122518135">Operation</strong> column.</span></li><li id="drs_10_0412__li1764125135215"><span>In the displayed <strong id="drs_10_0412__b4627123717134">Restart Task</strong> dialog box, click <strong id="drs_10_0412__b1627937141316">Yes</strong>.</span></li></ol>

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</table>
</div>
</div>
<div class="section" id="drs_11_0009__en-us_topic_0000001160307886_section1553419449194"><h4 class="sectiontitle">MySQL -&gt; PostgreSQL Synchronization</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_11_0009__en-us_topic_0000001160307886_table155349444192" frame="border" border="1" rules="all"><caption><b>Table 4 </b>Checking whether the source database user has sufficient permissions </caption><tbody><tr id="drs_11_0009__en-us_topic_0000001160307886_row1053411448198"><th class="firstcol" valign="top" width="11%" id="mcps1.3.4.2.2.3.1.1"><p id="drs_11_0009__en-us_topic_0000001160307886_p1534944141914">Check Item</p>
</th>
<td class="cellrowborder" valign="top" width="89%" headers="mcps1.3.4.2.2.3.1.1 "><p id="drs_11_0009__en-us_topic_0000001160307886_p11535544181915">Whether the source database user has sufficient permissions</p>
</td>
</tr>
<tr id="drs_11_0009__en-us_topic_0000001160307886_row125351344101914"><th class="firstcol" valign="top" width="11%" id="mcps1.3.4.2.2.3.2.1"><p id="drs_11_0009__en-us_topic_0000001160307886_p953584411914">Description</p>
</th>
<td class="cellrowborder" valign="top" width="89%" headers="mcps1.3.4.2.2.3.2.1 "><p id="drs_11_0009__en-us_topic_0000001160307886_p135356449199">Check whether the source database user permissions meet the migration requirements. If the permissions are insufficient, the migration will fail.</p>
</td>
</tr>
<tr id="drs_11_0009__en-us_topic_0000001160307886_row1535204413195"><th class="firstcol" valign="top" width="11%" id="mcps1.3.4.2.2.3.3.1"><p id="drs_11_0009__en-us_topic_0000001160307886_p653564414190">Failure Cause and Handling Suggestion</p>
</th>
<td class="cellrowborder" valign="top" width="89%" headers="mcps1.3.4.2.2.3.3.1 "><p id="drs_11_0009__en-us_topic_0000001160307886_p828311612011">Failure cause: The source database user does not have sufficient permissions. During the incremental synchronization, the SELECT permission on INFORMATION_SCHEMA is required.</p>
<p id="drs_11_0009__en-us_topic_0000001160307886_p35913915237">Handling suggestions: Grant the source database user the corresponding permissions.</p>
<p id="drs_11_0009__en-us_topic_0000001160307886_p18490233192316">Run the following command:</p>
<pre class="codeblock" id="drs_11_0009__en-us_topic_0000001160307886_codeblock5901113917233">grant select on [dbname];</pre>
</td>
</tr>
</tbody>
</table>
</div>
</div>
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<p id="drs_11_0013__en-us_topic_0000001160307858_p11881133121620">Handling suggestion: Modify the character sets.</p>
<p id="drs_11_0013__en-us_topic_0000001160307858_p9237119193910">Run commands to modify the self-created source database.</p>
<ol id="drs_11_0013__en-us_topic_0000001160307858_ol5341648291247"><li id="drs_11_0013__en-us_topic_0000001160307858_li4889600891328">Check whether source and destination database character sets are consistent.<pre class="codeblock" id="drs_11_0013__en-us_topic_0000001160307858_codeblock1213950692042"><strong id="drs_11_0013__en-us_topic_0000001160307858_b4889233091324">show variables like "character_set_server"\G;</strong></pre>
<p id="drs_11_0013__en-us_topic_0000001160307858_p146512611519"><span><img id="drs_11_0013__en-us_topic_0000001160307858_image16651361516" src="en-us_image_0000001758549597.png"></span></p>
<p id="drs_11_0013__en-us_topic_0000001160307858_p146512611519"><span><img id="drs_11_0013__en-us_topic_0000001160307858_image16651361516" src="en-us_image_0000001758549597.png" title="Click to enlarge" class="imgResize"></span></p>
</li><li id="drs_11_0013__en-us_topic_0000001160307858_li364625391310">Modify the character set of the source database server.<pre class="codeblock" id="drs_11_0013__en-us_topic_0000001160307858_codeblock6342703092051"><strong id="drs_11_0013__en-us_topic_0000001160307858_b5284547791339">set character_set_server='utf8';</strong></pre>
<p id="drs_11_0013__en-us_topic_0000001160307858_p12941192617508"><span><img id="drs_11_0013__en-us_topic_0000001160307858_image594120263507" src="en-us_image_0000001758429769.png"></span></p>
<p id="drs_11_0013__en-us_topic_0000001160307858_p12941192617508"><span><img id="drs_11_0013__en-us_topic_0000001160307858_image594120263507" src="en-us_image_0000001758429769.png" title="Click to enlarge" class="imgResize"></span></p>
</li></ol>
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<tr id="drs_11_0014__en-us_topic_0000001205747837_row1605119819632"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.2.3.3.1 "><p id="drs_11_0014__en-us_topic_0000001205747837_p84501827171211">Failure cause: The binlog function is disabled on the source database.</p>
<p id="drs_11_0014__en-us_topic_0000001205747837_p188251676138">Handling suggestion:</p>
<ul id="drs_11_0014__en-us_topic_0000001205747837_ul1578371832611"><li id="drs_11_0014__en-us_topic_0000001205747837_li7783151819263">If the source is an on-premises database, perform the following operations to enable binlog.<ol id="drs_11_0014__en-us_topic_0000001205747837_ol1378310183261"><li id="drs_11_0014__en-us_topic_0000001205747837_li4783161812617">Run the following command to check whether binlog is enabled:<pre class="codeblock" id="drs_11_0014__en-us_topic_0000001205747837_codeblock1278313187263"><strong id="drs_11_0014__en-us_topic_0000001205747837_b18783218122615">show variables like "log_bin"\G;</strong></pre>
<p id="drs_11_0014__en-us_topic_0000001205747837_p25474920524"><span><img id="drs_11_0014__en-us_topic_0000001205747837_image15549492526" src="en-us_image_0000001710629852.png"></span></p>
</li><li id="drs_11_0014__en-us_topic_0000001205747837_li137831118112611">If binlog is disabled, add <strong id="drs_11_0014__en-us_topic_0000001205747837_b5921651601">log-bin = mysql-bin</strong> followed by <strong id="drs_11_0014__en-us_topic_0000001205747837_b2921451205">[mysqld]</strong> in the MySQL configuration file <strong id="drs_11_0014__en-us_topic_0000001205747837_b9941751105">my.cnf</strong> or <strong id="drs_11_0014__en-us_topic_0000001205747837_b1624133319532">my.ini</strong>.<p id="drs_11_0014__en-us_topic_0000001205747837_p729190175318"><span><img id="drs_11_0014__en-us_topic_0000001205747837_image829110035313" src="en-us_image_0000001758549285.png"></span></p>
</li><li id="drs_11_0014__en-us_topic_0000001205747837_li187831818142610">Restart the database.<p id="drs_11_0014__en-us_topic_0000001205747837_p643414108533"><a name="drs_11_0014__en-us_topic_0000001205747837_li187831818142610"></a><a name="en-us_topic_0000001205747837_li187831818142610"></a><span><img id="drs_11_0014__en-us_topic_0000001205747837_image144341105531" src="en-us_image_0000001710470364.jpg"></span></p>
<p id="drs_11_0014__en-us_topic_0000001205747837_p25474920524"><span><img id="drs_11_0014__en-us_topic_0000001205747837_image15549492526" src="en-us_image_0000001710629852.png" title="Click to enlarge" class="imgResize"></span></p>
</li><li id="drs_11_0014__en-us_topic_0000001205747837_li137831118112611">If binlog is disabled, add <strong id="drs_11_0014__en-us_topic_0000001205747837_b5921651601">log-bin = mysql-bin</strong> followed by <strong id="drs_11_0014__en-us_topic_0000001205747837_b2921451205">[mysqld]</strong> in the MySQL configuration file <strong id="drs_11_0014__en-us_topic_0000001205747837_b9941751105">my.cnf</strong> or <strong id="drs_11_0014__en-us_topic_0000001205747837_b1624133319532">my.ini</strong>.<p id="drs_11_0014__en-us_topic_0000001205747837_p729190175318"><span><img id="drs_11_0014__en-us_topic_0000001205747837_image829110035313" src="en-us_image_0000001758549285.png" title="Click to enlarge" class="imgResize"></span></p>
</li><li id="drs_11_0014__en-us_topic_0000001205747837_li187831818142610">Restart the database.<p id="drs_11_0014__en-us_topic_0000001205747837_p643414108533"><a name="drs_11_0014__en-us_topic_0000001205747837_li187831818142610"></a><a name="en-us_topic_0000001205747837_li187831818142610"></a><span><img id="drs_11_0014__en-us_topic_0000001205747837_image144341105531" src="en-us_image_0000001710470364.jpg" title="Click to enlarge" class="imgResize"></span></p>
</li></ol>
</li><li id="drs_11_0014__en-us_topic_0000001205747837_li10237122218263">If the source is an RDS instance, enable binlog by referring to the RDS official documentation.</li></ul>
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<a name="drs_11_0075"></a><a name="drs_11_0075"></a>
<h1 class="topictitle1">Checking Whether Destination Contains the Configured Database</h1>
<div id="body8662426"><div class="section" id="drs_11_0075__en-us_topic_0000001160149280_section16333111117127"><h4 class="sectiontitle">MySQL &gt; PostgreSQL</h4>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="drs_11_0075__en-us_topic_0000001160149280_table18108192214474" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Checking whether destination contains the configured database</caption><tbody><tr id="drs_11_0075__en-us_topic_0000001160149280_row19108192294711"><th class="firstcol" valign="top" width="10.99%" id="mcps1.3.1.2.2.3.1.1"><p id="drs_11_0075__en-us_topic_0000001160149280_p191087222477">Check Item</p>
</th>
<td class="cellrowborder" valign="top" width="89.01%" headers="mcps1.3.1.2.2.3.1.1 "><p id="drs_11_0075__p1594371517128">Whether the destination contains the configured database.</p>
</td>
</tr>
<tr id="drs_11_0075__en-us_topic_0000001160149280_row3108132254714"><th class="firstcol" valign="top" width="10.99%" id="mcps1.3.1.2.2.3.2.1"><p id="drs_11_0075__en-us_topic_0000001160149280_p1710810224473">Description</p>
</th>
<td class="cellrowborder" valign="top" width="89.01%" headers="mcps1.3.1.2.2.3.2.1 "><p id="drs_11_0075__en-us_topic_0000001160149280_p15372705185323">Databases and schemas cannot be migrated. You need to manually create databases and schemas on the destination database. Otherwise, the migration will fail.</p>
</td>
</tr>
<tr id="drs_11_0075__en-us_topic_0000001160149280_row212432224711"><th class="firstcol" rowspan="2" valign="top" width="10.99%" id="mcps1.3.1.2.2.3.3.1"><p id="drs_11_0075__en-us_topic_0000001160149280_p1412462211472">Failure Cause and Handling Suggestion</p>
<p id="drs_11_0075__en-us_topic_0000001160149280_p228811417810"></p>
</th>
<td class="cellrowborder" valign="top" width="89.01%" headers="mcps1.3.1.2.2.3.3.1 "><p id="drs_11_0075__en-us_topic_0000001160149280_p95461131184512">Failure cause: Databases cannot be migrated from MySQL to PostgreSQL.</p>
<p id="drs_11_0075__en-us_topic_0000001160149280_p7752512363">Handling suggestion: In the destination database, manually create databases and schemas with the same names as those of the source database.</p>
</td>
</tr>
<tr id="drs_11_0075__en-us_topic_0000001160149280_row1428618411887"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.2.3.3.1 "><p id="drs_11_0075__en-us_topic_0000001160149280_p1328814411816">Failure cause: The objects to be synchronized already exist in the destination database.</p>
<p id="drs_11_0075__en-us_topic_0000001160149280_p106225581191">Handling suggestions: Delete the tables to be synchronized from the destination database or select the tables that do not exist in the destination database for synchronization.</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="drs_12_0006.html">Destination DB Instance Statuses</a></div>
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<div id="body0000001161470814"><p id="drs_11_0457__p1121914206211">DRS real-time synchronization supports multiple topology types. You can plan the topology types as required. For details, see the following content.</p>
<div class="note" id="drs_11_0457__note457820289613"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="drs_11_0457__p185791528863">To ensure data consistency, do not modify the synchronization objects in the destination database.</p>
</div></div>
<div class="section" id="drs_11_0457__section41708456816"><h4 class="sectiontitle">One-to-One Real-Time Synchronization</h4><p id="drs_11_0457__p749684518481"><span><img id="drs_11_0457__image170717112267" src="en-us_image_0000001710629888.png"></span></p>
<div class="section" id="drs_11_0457__section41708456816"><h4 class="sectiontitle">One-to-One Real-Time Synchronization</h4><p id="drs_11_0457__p749684518481"><span><img id="drs_11_0457__image170717112267" src="en-us_image_0000001710629888.png" title="Click to enlarge" class="imgResize"></span></p>
<p id="drs_11_0457__p22768540482">You can create a one-to-one synchronization task.</p>
</div>
<div class="section" id="drs_11_0457__section953615261000"><h4 class="sectiontitle">One-to-Many Real-Time Synchronization</h4><p id="drs_11_0457__p57986471108"><span><img id="drs_11_0457__image7640151762618" src="en-us_image_0000001758549321.png"></span></p>
<div class="section" id="drs_11_0457__section953615261000"><h4 class="sectiontitle">One-to-Many Real-Time Synchronization</h4><p id="drs_11_0457__p57986471108"><span><img id="drs_11_0457__image7640151762618" src="en-us_image_0000001758549321.png" title="Click to enlarge" class="imgResize"></span></p>
<p id="drs_11_0457__p36834583015">You need to create multiple synchronization tasks to implement one-to-many real-time synchronization. For example, to synchronize data from instance A to instances B, C, and D, you need to create three synchronization tasks.</p>
</div>
<div class="section" id="drs_11_0457__section184911017513"><h4 class="sectiontitle">Many-to-One Real-Time Synchronization</h4><p id="drs_11_0457__p0304238512"><span><img id="drs_11_0457__image42069349268" src="en-us_image_0000001710470404.png"></span></p>
<div class="section" id="drs_11_0457__section184911017513"><h4 class="sectiontitle">Many-to-One Real-Time Synchronization</h4><p id="drs_11_0457__p0304238512"><span><img id="drs_11_0457__image42069349268" src="en-us_image_0000001710470404.png" title="Click to enlarge" class="imgResize"></span></p>
<p id="drs_11_0457__p1188015775">You need to create multiple synchronization tasks to implement many-to-one real-time synchronization. For example, to synchronize data from instances B, C, and D to instance A, you need to create three synchronization tasks. Multiple tables can be synchronized to one table.</p>
</div>
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</li>
<li class="ulchildlink"><strong><a href="drs_11_0041.html">Checking Whether the Extensions Are Supported</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="drs_11_0075.html">Checking Whether Destination Contains the Configured Database</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="drs_11_0230.html">Checking Whether the Destination DB Instance Is Available</a></strong><br>
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print("waiting...");
sleep(1000);
}</pre>
<ul id="drs_16_0001__en-us_topic_0000001205627815_ul12565194915129"><li id="drs_16_0001__en-us_topic_0000001205627815_li4565249121211">If the command output is <strong id="drs_16_0001__en-us_topic_0000001205627815_b844294052520">waiting</strong>, the balancer is migrating chunks. In this case, do not disable the balancer. Otherwise, data inconsistency may occur.<div class="fignone" id="drs_16_0001__en-us_topic_0000001205627815_fig045416443205"><span class="figcap"><b>Figure 1 </b>Viewing the command output</span><br><span><img id="drs_16_0001__en-us_topic_0000001205627815_image14454104442014" src="en-us_image_0000001710470892.png"></span></div>
<ul id="drs_16_0001__en-us_topic_0000001205627815_ul12565194915129"><li id="drs_16_0001__en-us_topic_0000001205627815_li4565249121211">If the command output is <strong id="drs_16_0001__en-us_topic_0000001205627815_b844294052520">waiting</strong>, the balancer is migrating chunks. In this case, do not disable the balancer. Otherwise, data inconsistency may occur.<div class="fignone" id="drs_16_0001__en-us_topic_0000001205627815_fig045416443205"><span class="figcap"><b>Figure 1 </b>Viewing the command output</span><br><span><img id="drs_16_0001__en-us_topic_0000001205627815_image14454104442014" src="en-us_image_0000001710470892.png" title="Click to enlarge" class="imgResize"></span></div>
</li><li id="drs_16_0001__en-us_topic_0000001205627815_li162765731317">If no command output is displayed, the balancer is not migrating any chunks. In this case, you can disable the balancer:</li></ul>
</p></li><li id="drs_16_0001__en-us_topic_0000001205627815_li0181165113"><span>Disable the balancer.</span><p><ul id="drs_16_0001__en-us_topic_0000001205627815_ul10907102081311"><li id="drs_16_0001__en-us_topic_0000001205627815_li1290717208130">If you migrate the entire DB instance, run the following command to disable the balancer.<pre class="screen" id="drs_16_0001__en-us_topic_0000001205627815_screen9551155581917">sh.stopBalancer()</pre>
</li><li id="drs_16_0001__en-us_topic_0000001205627815_li10683736141318">If you need to disable the balancer of the sharded collections to be migrated, run the following command:<pre class="screen" id="drs_16_0001__en-us_topic_0000001205627815_screen29531547253">sh.disableBalancing("database.collection")</pre>
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<div class="section" id="drs_16_0120__en-us_topic_0000001205429243_section122651026172618"><h4 class="sectiontitle">Operation Suggestions</h4><ul id="drs_16_0120__en-us_topic_0000001205429243_ul12252165642613"><li id="drs_16_0120__en-us_topic_0000001205429243_li1525218561262">To ensure that there is sufficient space during task creation, you are advised to calculate the total data volume of the source database and plan how to allocate the disk space of the destination instance. The remaining disk space must be greater than the total data volume of the source database. For example, if the data volume of source system1 is 1 GB, the data volume of source system2 is 3 GB, and the data volume of source system3 is 6 GB, the remaining disk space of the destination instance must be greater than 10 GB.</li><li id="drs_16_0120__en-us_topic_0000001205429243_li17202112132714">To improve the performance of the destination MySQL database, you are advised to use the <span class="uicontrol" id="drs_16_0120__en-us_topic_0000001205429243_uicontrol31754918445"><b>Save Change</b></span> function to configure common parameters (except <strong id="drs_16_0120__en-us_topic_0000001205429243_b9477163074411">max_connections</strong>). For performance parameters, you need to manually change the parameter values based on the specifications of the destination database.</li><li id="drs_16_0120__en-us_topic_0000001205429243_li1538485013311">When you create a many-to-one synchronization task, the task created later may block the task created earlier. This is because each synchronization task involves index creation. When an index is created, a schema lock may occur on the destination database, which blocks the synchronization of other tables in the schema. As a result, the previously created tasks cannot be synchronized. To avoid this problem, you are advised to set <strong id="drs_16_0120__en-us_topic_0000001205429243_b5264115619301">Start Time</strong> to <strong id="drs_16_0120__en-us_topic_0000001205429243_b383194133119">Start at a specified time</strong> to start a task during off-peak hours.</li><li id="drs_16_0120__en-us_topic_0000001205429243_li194971679715">For many-to-one synchronization tasks that involve the synchronization of the same table, DDL operations cannot be performed on source databases. Otherwise, all synchronization tasks fail.</li></ul>
</div>
<div class="section" id="drs_16_0120__en-us_topic_0000001205429243_section938305118331"><h4 class="sectiontitle">Many-to-One Data Migration</h4><p id="drs_16_0120__en-us_topic_0000001205429243_p118753412711">Data migration aims to migrate the entire database. Multiple databases can be migrated at the instance level. Databases with the same name in the source system cannot be migrated and database name mapping is not supported.</p>
<div class="fignone" id="drs_16_0120__en-us_topic_0000001205429243_fig18343125511345"><span class="figcap"><b>Figure 1 </b>Many-to-one data migration</span><br><span><img id="drs_16_0120__en-us_topic_0000001205429243_image36441026185414" src="en-us_image_0000001758549529.png"></span></div>
<div class="fignone" id="drs_16_0120__en-us_topic_0000001205429243_fig18343125511345"><span class="figcap"><b>Figure 1 </b>Many-to-one data migration</span><br><span><img id="drs_16_0120__en-us_topic_0000001205429243_image36441026185414" src="en-us_image_0000001758549529.png" title="Click to enlarge" class="imgResize"></span></div>
</div>
<div class="section" id="drs_16_0120__en-us_topic_0000001205429243_section1145210344298"><h4 class="sectiontitle">Flow Chart</h4><p id="drs_16_0120__en-us_topic_0000001205429243_p32844010301">When creating a task, ensure that the second task is created after the first task has entered the full migration state.</p>
<div class="fignone" id="drs_16_0120__en-us_topic_0000001205429243_fig79286483293"><span class="figcap"><b>Figure 2 </b>Flow chart</span><br><span><img id="drs_16_0120__en-us_topic_0000001205429243_image76873814714" src="en-us_image_0000001710470616.png"></span></div>
<div class="fignone" id="drs_16_0120__en-us_topic_0000001205429243_fig79286483293"><span class="figcap"><b>Figure 2 </b>Flow chart</span><br><span><img id="drs_16_0120__en-us_topic_0000001205429243_image76873814714" src="en-us_image_0000001710470616.png" title="Click to enlarge" class="imgResize"></span></div>
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</th>
</tr>
</thead>
<tbody><tr id="drs_change_history__row1347515182184"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p24751918141810">2025-02-10</p>
<tbody><tr id="drs_change_history__row156871943111119"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p1568784314113">2025-09-09</p>
</td>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p1247571871811">This issue is the seventeenth official release, which incorporates the following change:</p>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p12687124317116">This is the twentieth official release.</p>
<p id="drs_change_history__p12911737175117">Added the following content:</p>
<ul id="drs_change_history__ul1182152035214"><li id="drs_change_history__li1976385885113">Supported self-built-to-self-built synchronization from MySQL to MySQL.</li></ul>
<p id="drs_change_history__p64781210175213">Deleted the following content:</p>
<ul id="drs_change_history__ul194405294911"><li id="drs_change_history__li144485231518">Deleted self-built-to-self-built synchronization from MySQL to Kafka.</li><li id="drs_change_history__li3796319537">Deleted GaussDB Centralized, CSS/ES, MySQL -&gt; Oracle, DDM -&gt; Oracle, DDM -&gt; GaussDB(DWS), and Microsoft SQL Server from task parameters in real-time synchronization parameter management.</li><li id="drs_change_history__li15172592034">Deleted the section "Changing a Single-AZ Task to a Dual-AZ Task" in "Real-Time Synchronization Task Life Cycle".</li><li id="drs_change_history__li1991111920312">Deleted the section "Checking Whether Destination Contains the Configured Database" in "Destination DB Instance Statuses" of <em id="drs_change_history__i3654641172118">Troubleshooting</em>.</li></ul>
</td>
</tr>
<tr id="drs_change_history__row7594134613492"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p3594204619499">2025-07-17</p>
</td>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p1594184654911">This issue is the nineteenth official release, which incorporates the following change:</p>
<ul id="drs_change_history__ul1161617675110"><li id="drs_change_history__li1616206115113">Modified the description of DRS synchronization object names.</li></ul>
</td>
</tr>
<tr id="drs_change_history__row1347515182184"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p24751918141810">2025-02-10</p>
</td>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p1247571871811">This issue is the eighteenth official release, which incorporates the following change:</p>
<ul id="drs_change_history__ul25789541186"><li id="drs_change_history__li457810540181">Added six types of specifications for DRS synchronization tasks.</li></ul>
</td>
</tr>
<tr id="drs_change_history__row10352358101810"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p1621890141917">2024-06-11</p>
</td>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p192181105199">This issue is the sixteenth official release, which incorporates the following changes:</p>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p192181105199">This issue is the seventeenth official release, which incorporates the following changes:</p>
<ul id="drs_change_history__ul02181006197"><li id="drs_change_history__li5218140171910">Optimized the content in "Processing Data."</li><li id="drs_change_history__li17522721310">Optimized the content in "Importing Synchronization Objects."</li><li id="drs_change_history__li8421191010">Supported real-time synchronization for PostgreSQL 15.</li></ul>
</td>
</tr>
@ -83,7 +98,7 @@
<tr id="drs_change_history__row81084197147"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p133512342377">2021-08-30</p>
</td>
<td class="cellrowborder" valign="top" width="81.54%" headers="mcps1.3.1.1.3.1.2 "><p id="drs_change_history__p48101584375">This issue is the sixth official release, which incorporates the following changes:</p>
<ul id="drs_change_history__ul08115584370"><li id="drs_change_history__li188115584375">Supported real-time synchronization from MySQL to TaurusDB across AZs.</li></ul>
<ul id="drs_change_history__ul08115584370"><li id="drs_change_history__li188115584375">Supported real-time synchronization from MySQL to TaurusDB Cluster across AZs.</li></ul>
</td>
</tr>
<tr id="drs_change_history__row18577123142614"><td class="cellrowborder" valign="top" width="18.459999999999997%" headers="mcps1.3.1.1.3.1.1 "><p id="drs_change_history__p5189354121520">2021-05-31</p>

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