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ddm_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
2025-10-10 12:17:53 +00:00
committed by zuul
parent 6f818add66
commit 9a6a028567
16 changed files with 656 additions and 300 deletions
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<tr id="ddm_02_0000__row19792241185513"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.1.2.3.2.1.2.3.1.1 "><p id="ddm_02_0000__p684143418318">Schema</p>
</td>
<td class="cellrowborder" valign="top" width="79%" headers="mcps1.3.1.2.3.2.1.2.3.1.2 "><p id="ddm_02_0000__p78418343314">Schema to be associated with the DDM account. You can select an existing schema from the drop-down list.</p>
<p id="ddm_02_0000__p08411134123118">Only the associated schemas can be accessed using the account.</p>
<p id="ddm_02_0000__p08411134123118">The account can be used to access only the associated schemas.</p>
</td>
</tr>
<tr id="ddm_02_0000__row0533163934910"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.1.2.3.2.1.2.3.1.1 "><p id="ddm_02_0000__p15352390493">Permissions</p>

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<td class="cellrowborder" valign="top" width="17.398260173982603%" headers="mcps1.3.3.2.2.7.1.6 "><p id="ddm_03_0051__en-us_topic_0242898940_p8811191331919">1 minute</p>
</td>
</tr>
<tr id="ddm_03_0051__en-us_topic_0242898940_row208978557516"><td class="cellrowborder" valign="top" width="14.72852714728527%" headers="mcps1.3.3.2.2.7.1.1 "><p id="ddm_03_0051__en-us_topic_0242898940_p889755511514">ddm_kernel_fgc_cnt</p>
</td>
<td class="cellrowborder" valign="top" width="11.738826117388262%" headers="mcps1.3.3.2.2.7.1.2 "><p id="ddm_03_0051__en-us_topic_0242898940_p17897115595111">Kernel Full GC Times</p>
</td>
<td class="cellrowborder" valign="top" width="27.657234276572346%" headers="mcps1.3.3.2.2.7.1.3 "><p id="ddm_03_0051__en-us_topic_0242898940_p989745595120">Full GC times of each DDM node per minute</p>
</td>
<td class="cellrowborder" valign="top" width="12.548745125487452%" headers="mcps1.3.3.2.2.7.1.4 "><p id="ddm_03_0051__en-us_topic_0242898940_p9572155316557">≥ 0 counts</p>
</td>
<td class="cellrowborder" valign="top" width="15.928407159284072%" headers="mcps1.3.3.2.2.7.1.5 "><p id="ddm_03_0051__en-us_topic_0242898940_p7141812568">DDM nodes</p>
</td>
<td class="cellrowborder" valign="top" width="17.398260173982603%" headers="mcps1.3.3.2.2.7.1.6 "><p id="ddm_03_0051__en-us_topic_0242898940_p1089885555120">1 minute</p>
</td>
</tr>
<tr id="ddm_03_0051__en-us_topic_0242898940_row16956164018564"><td class="cellrowborder" valign="top" width="14.72852714728527%" headers="mcps1.3.3.2.2.7.1.1 "><p id="ddm_03_0051__en-us_topic_0242898940_p149561940185611">ddm_node_status_alarm_code</p>
</td>
<td class="cellrowborder" valign="top" width="11.738826117388262%" headers="mcps1.3.3.2.2.7.1.2 "><p id="ddm_03_0051__en-us_topic_0242898940_p6956134065611">DDM Node Connectivity</p>
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<td class="cellrowborder" valign="top" width="17.398260173982603%" headers="mcps1.3.3.2.2.7.1.6 "><p id="ddm_03_0051__en-us_topic_0242898940_p159573407563">1 minute</p>
</td>
</tr>
<tr id="ddm_03_0051__en-us_topic_0242898940_row14475135152215"><td class="cellrowborder" valign="top" width="14.72852714728527%" headers="mcps1.3.3.2.2.7.1.1 "><p id="ddm_03_0051__en-us_topic_0242898940_p144110178102">ddm_global_sequence_threshold_exceeded_count</p>
</td>
<td class="cellrowborder" valign="top" width="11.738826117388262%" headers="mcps1.3.3.2.2.7.1.2 "><p id="ddm_03_0051__en-us_topic_0242898940_p1244141711019">Global Secondary Sequences Beyond Threshold</p>
</td>
<td class="cellrowborder" valign="top" width="27.657234276572346%" headers="mcps1.3.3.2.2.7.1.3 "><p id="ddm_03_0051__en-us_topic_0242898940_p24411417101018">Number of global sequences whose usage exceeds 75%. Usage = Current value/Maximum value. The default threshold is 75%. The maximum value of a global sequence depends on the global sequence type. For example, the maximum value of BIGINT is 2^63-1.</p>
</td>
<td class="cellrowborder" valign="top" width="12.548745125487452%" headers="mcps1.3.3.2.2.7.1.4 "><p id="ddm_03_0051__en-us_topic_0242898940_p5441161711010">≥ 0 counts</p>
</td>
<td class="cellrowborder" valign="top" width="15.928407159284072%" headers="mcps1.3.3.2.2.7.1.5 "><p id="ddm_03_0051__en-us_topic_0242898940_p761019376118">DDM instances</p>
</td>
<td class="cellrowborder" valign="top" width="17.398260173982603%" headers="mcps1.3.3.2.2.7.1.6 "><p id="ddm_03_0051__en-us_topic_0242898940_p104411417101016">10 minutes</p>
</td>
</tr>
</tbody>
</table>
</div>

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<td class="cellrowborder" valign="top" headers="mcps1.3.2.2.4.1.2 "><p id="ddm_04_0025__p11321172519219">After a physical table is deleted, data stored on DDM will be lost. The corresponding logical table becomes unavailable on DDM.</p>
</td>
</tr>
<tr id="ddm_04_0025__row124737268816"><td class="cellrowborder" valign="top" headers="mcps1.3.2.2.4.1.1 "><p id="ddm_04_0025__p114738261289">Modifying the name of a physical table created on DDM</p>
<tr id="ddm_04_0025__row124737268816"><td class="cellrowborder" valign="top" headers="mcps1.3.2.2.4.1.1 "><p id="ddm_04_0025__p114738261289">Changing the name of a physical table created on DDM</p>
</td>
<td class="cellrowborder" valign="top" headers="mcps1.3.2.2.4.1.2 "><p id="ddm_04_0025__p1147318261083">DDM cannot obtain data of the corresponding logical table, and the logical table becomes unavailable on DDM.</p>
</td>

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</li>
<li class="ulchildlink"><strong><a href="ddm_05_0008.html">Resetting the Password of an Account</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="ddm_05_0020.html">Managing Permissions</a></strong><br>
</li>
</ul>
</div>

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<h1 class="topictitle1">Creating an Account</h1>
<div id="body1585554409299"><div class="section" id="ddm_05_0002__section096911171979"><h4 class="sectiontitle">Prerequisites</h4><ul id="ddm_05_0002__ul17317123816495"><li id="ddm_05_0002__li14317133816491">You have logged in to the DDM console.</li><li id="ddm_05_0002__li16981210165518">There are schemas available in the DDM instance that you want to create an account for.</li></ul>
</div>
<div class="section" id="ddm_05_0002__section18952118124916"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_05_0002__ol172601822134919"><li id="ddm_05_0002__li18845223192514"><span>In the instance list, locate the required DDM instance and click its name.</span></li><li id="ddm_05_0002__li16917753172513"><span>In the navigation pane, choose <strong id="ddm_05_0002__b1293162314445">Accounts</strong>.</span></li><li id="ddm_05_0002__li12604227495"><span>On the displayed page, click <strong id="ddm_05_0002__b139231941201012">Create Account</strong> and configure the required parameters.</span><p><p id="ddm_05_0002__p029754414612"></p>
<div class="section" id="ddm_05_0002__section18952118124916"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_05_0002__ol172601822134919"><li id="ddm_05_0002__li18845223192514"><span>In the instance list, locate the required DDM instance and click its name.</span></li><li id="ddm_05_0002__li16917753172513"><span>In the navigation pane, choose <strong id="ddm_05_0002__b1293162314445">Accounts</strong>.</span></li><li id="ddm_05_0002__li12604227495"><span>On the displayed page, click <strong id="ddm_05_0002__b765035713517">Create Account</strong> and configure the required parameters.</span><p><p id="ddm_05_0002__p029754414612"></p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="ddm_05_0002__table12803338145112" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Required parameters</caption><thead align="left"><tr id="ddm_05_0002__row28007385516"><th align="left" class="cellrowborder" valign="top" width="21%" id="mcps1.3.2.2.3.2.2.2.3.1.1"><p id="ddm_05_0002__p9800133815110"><strong id="ddm_05_0002__b4303142234619">Parameter</strong></p>
</th>
@ -20,7 +20,7 @@
<tr id="ddm_05_0002__row1480113811519"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.2.2.3.2.2.2.3.1.1 "><p id="ddm_05_0002__p10801638175118">Password</p>
</td>
<td class="cellrowborder" valign="top" width="79%" headers="mcps1.3.2.2.3.2.2.2.3.1.2 "><p id="ddm_05_0002__p78011038175112">Password of the account. The password:</p>
<ul id="ddm_05_0002__ul6801153819514"><li id="ddm_05_0002__li1380123835110">Can include 8 to 32 characters.</li><li id="ddm_05_0002__li568620181711">Must contain at least three of the following character types: lowercase letters, uppercase letters, digits, and special characters ~!@#%^*-_=+?</li><li id="ddm_05_0002__li211322910598">Cannot be a weak password. It cannot be overly simple and easily guessed.</li><li id="ddm_05_0002__li4388184703919">Cannot be the username or the username spelled backwards.</li></ul>
<ul id="ddm_05_0002__ul6801153819514"><li id="ddm_05_0002__li1380123835110">Can include 8 to 32 characters.</li><li id="ddm_05_0002__li568620181711">Must contain at least three of the following character types: lowercase letters, uppercase letters, digits, and special characters ~!@#%^*-_+?</li><li id="ddm_05_0002__li211322910598">Cannot be a weak password. It cannot be overly simple and easily guessed.</li><li id="ddm_05_0002__li4388184703919">Cannot be the username or the username spelled backwards.</li></ul>
</td>
</tr>
<tr id="ddm_05_0002__row158011385516"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.3.2.2.3.2.2.2.3.1.1 "><p id="ddm_05_0002__p780153835111">Confirm Password</p>

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<h1 class="topictitle1">Resetting the Password of an Account</h1>
<div id="body0000001086698804"><div class="section" id="ddm_05_0008__section1539512419299"><h4 class="sectiontitle">Prerequisites</h4><ul id="ddm_05_0008__ul02984652012"><li id="ddm_05_0008__li192997652019">You have logged in to the DDM console.</li><li id="ddm_05_0008__li5299196112012">Resetting the DDM account password is a high-risk operation. Ensure that you have the IAM permission to modify DDM accounts.</li></ul>
</div>
<div class="section" id="ddm_05_0008__section766111524611"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_05_0008__ol172601822134919"><li id="ddm_05_0008__li18845223192514"><span>In the instance list, locate the DDM instance with the account whose password you want to reset and click its name.</span></li><li id="ddm_05_0008__li16917753172513"><span>In the navigation pane, choose <strong id="ddm_05_0008__b13301310183215">Accounts</strong>.</span></li><li id="ddm_05_0008__li877881015353"><span>In the account list, locate the required account and choose <strong id="ddm_05_0008__b197356131329">More</strong> &gt; <strong id="ddm_05_0008__b473711311327">Reset Password</strong> in the <strong id="ddm_05_0008__b1173781373219">Operation</strong> column.</span></li><li id="ddm_05_0008__li31613483616"><span>In the displayed dialog box, enter the new password, confirm the new password, and click <strong id="ddm_05_0008__b981514919337">OK</strong>.</span></li></ol>
<div class="section" id="ddm_05_0008__section766111524611"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_05_0008__ol172601822134919"><li id="ddm_05_0008__li18845223192514"><span>In the instance list, locate the DDM instance with the account whose password you want to reset and click its name.</span></li><li id="ddm_05_0008__li16917753172513"><span>In the navigation pane, choose <strong id="ddm_05_0008__b13301310183215">Accounts</strong>.</span></li><li id="ddm_05_0008__li877881015353"><span>In the account list, locate the required account and choose <strong id="ddm_05_0008__b1588295217526">More</strong> &gt; <strong id="ddm_05_0008__b188822523522">Reset Password</strong> in the <strong id="ddm_05_0008__b888255210523">Operation</strong> column.</span></li><li id="ddm_05_0008__li31613483616"><span>In the displayed dialog box, enter the new password, confirm the new password, and click <strong id="ddm_05_0008__b981514919337">OK</strong>.</span></li></ol>
</div>
</div>
<div>

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<a name="ddm_05_0020"></a><a name="ddm_05_0020"></a>
<h1 class="topictitle1">Managing Permissions</h1>
<div id="body0000001175237459"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="ddm_12_0002.html">Account Permissions</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="ddm_12_0003.html">Account Requirements</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="ddm_12_0004.html">Managing Permissions</a></strong><br>
</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="ddm_05_0001.html">Account Management</a></div>
</div>
</div>

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<div class="note" id="ddm_05_0134__note1442122410492"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="ddm_05_0134__p144315241499">Deleted accounts cannot be recovered. Exercise caution when performing this operation.</p>
</div></div>
</div>
<div class="section" id="ddm_05_0134__section1024831334916"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_05_0134__ol172601822134919"><li id="ddm_05_0134__li18845223192514"><span>In the instance list, locate the DDM instance with the account that you want to delete and click its name.</span></li><li id="ddm_05_0134__li16917753172513"><span>In the navigation pane, choose <strong id="ddm_05_0134__b1343101215226">Accounts</strong>.</span></li><li id="ddm_05_0134__li877881015353"><span>In the account list, locate the account that you want to delete and choose <strong id="ddm_05_0134__b91905541103">More</strong> &gt; <strong id="ddm_05_0134__b319521517221">Delete</strong> in the <strong id="ddm_05_0134__b119613153224">Operation</strong> column.</span></li><li id="ddm_05_0134__li31613483616"><span>In the displayed dialog box, click <span class="uicontrol" id="ddm_05_0134__uicontrol16741322102218"><b>Yes</b></span>.</span></li></ol>
<div class="section" id="ddm_05_0134__section1024831334916"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_05_0134__ol172601822134919"><li id="ddm_05_0134__li18845223192514"><span>In the instance list, locate the DDM instance with the account that you want to delete and click its name.</span></li><li id="ddm_05_0134__li16917753172513"><span>In the navigation pane, choose <strong id="ddm_05_0134__b94571240145215">Accounts</strong>.</span></li><li id="ddm_05_0134__li877881015353"><span>In the account list, locate the account that you want to delete and choose <strong id="ddm_05_0134__b13897442185211">More</strong> &gt; <strong id="ddm_05_0134__b2897442155218">Delete</strong> in the <strong id="ddm_05_0134__b4897342135216">Operation</strong> column.</span></li><li id="ddm_05_0134__li31613483616"><span>In the displayed dialog box, click <span class="uicontrol" id="ddm_05_0134__uicontrol16741322102218"><b>Yes</b></span>.</span></li></ol>
</div>
</div>
<div>

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</div>
<div class="section" id="ddm_06_0007__s2e6dd0a283024771aff961abc306652a"><h4 class="sectiontitle">Precautions</h4><p id="ddm_06_0007__p598643802114">The destination DDM instance has no schemas with the same name.</p>
</div>
<div class="section" id="ddm_06_0007__section862114653117"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_06_0007__ol12323258"><li id="ddm_06_0007__li1135718381115"><span>Log in to the DDM console, in the instance list, locate the DDM instance that you want to import schema information into and click its name.</span></li><li id="ddm_06_0007__li58659836"><span>On the displayed page, in the navigation pane, choose <strong id="ddm_06_0007__b54061697557">Schemas</strong>.</span></li><li id="ddm_06_0007__li3554164620431"><span>On the displayed page, click <strong id="ddm_06_0007__b91206152555">Import Schema Information</strong>.</span></li><li id="ddm_06_0007__li144106359409"><span>On the displayed page, click <strong id="ddm_06_0007__b1616517267243">Select File</strong> to select the required JSON file which has been exported in <a href="ddm_06_0015.html">Exporting Schema Information</a>.</span></li><li id="ddm_06_0007__li11342421162014"><span>Select the required data nodes, enter a database account with required permissions, and click <strong id="ddm_06_0007__b14811013192615">Finish</strong>.</span><p><div class="note" id="ddm_06_0007__note1089312310479"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="ddm_06_0007__ul1549091153420"><li id="ddm_06_0007__li1249081193415">The number of selected data nodes is the same as the number of data nodes imported into the DDM instance.</li><li id="ddm_06_0007__li104903163416">Required permissions: SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, PROCESS, REFERENCES, INDEX, ALTER, SHOW DATABASES, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER WITH GRANT OPTION<p id="ddm_06_0007__p590985054416"><a name="ddm_06_0007__li104903163416"></a><a name="li104903163416"></a>You can create a database account for the RDS for MySQL instance and assign it the above permissions in advance.</p>
<div class="section" id="ddm_06_0007__section862114653117"><h4 class="sectiontitle">Procedure</h4><ol id="ddm_06_0007__ol12323258"><li id="ddm_06_0007__li1135718381115"><span>Log in to the DDM console, in the instance list, locate the DDM instance that you want to import schema information into and click its name.</span></li><li id="ddm_06_0007__li58659836"><span>On the displayed page, in the navigation pane, choose <strong id="ddm_06_0007__b54061697557">Schemas</strong>.</span></li><li id="ddm_06_0007__li3554164620431"><span>On the displayed page, click <strong id="ddm_06_0007__b91206152555">Import Schema Information</strong>.</span></li><li id="ddm_06_0007__li144106359409"><span>On the displayed page, click <strong id="ddm_06_0007__b1616517267243">Select File</strong> to select the required JSON file which has been exported in <a href="ddm_06_0015.html">Exporting Schema Information</a>.</span></li><li id="ddm_06_0007__li11342421162014"><span>Select the required data nodes, enter a database account with required permissions, and click <strong id="ddm_06_0007__b1179929205115">Finish</strong>.</span><p><div class="note" id="ddm_06_0007__note1089312310479"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="ddm_06_0007__ul1549091153420"><li id="ddm_06_0007__li1249081193415">The number of selected data nodes is the same as the number of data nodes imported into the DDM instance.</li><li id="ddm_06_0007__li104903163416">Required permissions: SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, PROCESS, REFERENCES, INDEX, ALTER, SHOW DATABASES, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER WITH GRANT OPTION<p id="ddm_06_0007__p590985054416"><a name="ddm_06_0007__li104903163416"></a><a name="li104903163416"></a>You can create a database account for the RDS for MySQL instance and assign it the above permissions in advance.</p>
</li></ul>
</div></div>
</p></li></ol>

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<p id="ddm_06_0017__p46473114585">When you delete a schema by mistake or your RDS for MySQL instances become abnormal, metadata restoration allows you to restore your DDM instance metadata and match the metadata with the RDS instance that has completed PITR to re-establish the relationship between your DDM instance and RDS instance. Metadata restoration supports only RDS for MySQL.</p>
<p id="ddm_06_0017__p533912361448">To restore metadata of a DDM instance, you can specify a point in time by referring to <a href="#ddm_06_0017__section128315484524">Restoring Metadata to a Point in Time</a>, or using an available backup by referring to <a href="#ddm_06_0017__section132806221525">Restoring Metadata Using Backups</a>.</p>
<p id="ddm_06_0017__p115306341696">Metadata restoration mainly restores the metadata of your DDM instance to a new DDM instance. It starts after a point-in-time recovery (PITR) for the associated data nodes is complete.</p>
<div class="section" id="ddm_06_0017__section738494914255"><h4 class="sectiontitle">Prerequisites</h4><ul id="ddm_06_0017__ul935817253264"><li id="ddm_06_0017__li23588251267">There is a source DDM instance available and associated with an RDS for MySQL instance. This DB instance is the source data node.</li><li id="ddm_06_0017__li10969101072817">The source data node has been restored to a specified time point.</li></ul>
<div class="section" id="ddm_06_0017__section738494914255"><h4 class="sectiontitle">Prerequisites</h4><ul id="ddm_06_0017__ul935817253264"><li id="ddm_06_0017__li23588251267">There is a source DDM instance available and associated with an RDS for MySQL instance. This DB instance is the source data node.</li><li id="ddm_06_0017__li10969101072817">The data from the source data node has been restored to the destination data node as it existed at a specified point in time.</li><li id="ddm_06_0017__li524210671711">The destination RDS for MySQL instance and the destination DDM instance must be deployed in the same VPC and subnet and have the same security group rules.</li></ul>
</div>
<div class="section" id="ddm_06_0017__section16311542101119"><h4 class="sectiontitle">Constraints</h4><ul id="ddm_06_0017__ul1983134241110"><li id="ddm_06_0017__li884942201112">The destination DDM instance is not associated with any RDS for MySQL instance and has no schemas or accounts.</li><li id="ddm_06_0017__li02281512112">Restoration is not supported if the destination DDM instance is in the primary network and its associated RDS for MySQL instance is in the extended network.</li><li id="ddm_06_0017__li750871015158">The source DDM instance must be of the version 2.3.2.11 or later, and the destination DDM instance must be of the version 3.0.8 or later.</li><li id="ddm_06_0017__li3128144163914">Time points that data can be restored to depend on the backup policy set on original data nodes.</li></ul>
<div class="section" id="ddm_06_0017__section16311542101119"><h4 class="sectiontitle">Constraints</h4><ul id="ddm_06_0017__ul1983134241110"><li id="ddm_06_0017__li884942201112">The destination DDM instance is not associated with any RDS for MySQL instance and has no schemas and accounts.</li><li id="ddm_06_0017__li02281512112">Restoration is not supported if the destination DDM instance is in the primary network and its associated RDS for MySQL instance is in the extended network.</li><li id="ddm_06_0017__li750871015158">The source DDM instance must be of the version 2.3.2.11 or later, and the destination DDM instance must be of the version 3.0.8 or later.</li><li id="ddm_06_0017__li3128144163914">Time points that data can be restored to depend on the backup policy set on original data nodes.</li><li id="ddm_06_0017__li4865172813345">The time point to which metadata is restored must be the same as that to which an RDS for MySQL instance is restored.</li></ul>
</div>
<div class="section" id="ddm_06_0017__section128315484524"><a name="ddm_06_0017__section128315484524"></a><a name="section128315484524"></a><h4 class="sectiontitle">Restoring Metadata to a Point in Time</h4><ol id="ddm_06_0017__ol5371100162518"><li id="ddm_06_0017__li1366514210243"><span>Log in to the DDM console.</span></li><li id="ddm_06_0017__li4793191882712"><a name="ddm_06_0017__li4793191882712"></a><a name="li4793191882712"></a><span><a href="ddm_06_0132.html">Create a new DDM instance</a> and use it as the destination DDM instance. For details, see<a href="ddm_06_0132.html">Creating a DDM Instance</a>.</span></li><li id="ddm_06_0017__li203725032512"><span>In the DDM instance list, locate the source instance and click its name.</span></li><li id="ddm_06_0017__li382416102214"><span>In the navigation pane on the left, choose <strong id="ddm_06_0017__b2066407356621">Backups &amp; Restorations</strong>.</span></li><li id="ddm_06_0017__li723812134011"><span>Click <strong id="ddm_06_0017__b698802603620">Restore Metadata</strong>.</span></li><li id="ddm_06_0017__li179543119201"><span>On the displayed page, specify a time point. The source DDM instance will select an appropriate DDM metadata backup closest to the time point.</span><p>
<div class="section" id="ddm_06_0017__section128315484524"><a name="ddm_06_0017__section128315484524"></a><a name="section128315484524"></a><h4 class="sectiontitle">Restoring Metadata to a Point in Time</h4><ol id="ddm_06_0017__ol5371100162518"><li id="ddm_06_0017__li1366514210243"><span>Log in to the DDM console.</span></li><li id="ddm_06_0017__li4793191882712"><a name="ddm_06_0017__li4793191882712"></a><a name="li4793191882712"></a><span><a href="ddm_06_0132.html">Create a new DDM instance</a> and use it as the destination DDM instance. For details, see <a href="ddm_06_0132.html">Creating a DDM Instance</a>.</span></li><li id="ddm_06_0017__li203725032512"><span>In the DDM instance list, locate the source instance and click its name.</span></li><li id="ddm_06_0017__li382416102214"><span>In the navigation pane on the left, choose <strong id="ddm_06_0017__b2066407356621">Backups &amp; Restorations</strong>.</span></li><li id="ddm_06_0017__li723812134011"><span>Click <strong id="ddm_06_0017__b698802603620">Restore Metadata</strong>.</span></li><li id="ddm_06_0017__li179543119201"><span>On the displayed page, specify a time point. The source DDM instance will select an appropriate DDM metadata backup closest to the time point.</span><p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="ddm_06_0017__table1941672742313" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Parameter description</caption><thead align="left"><tr id="ddm_06_0017__row11417102722314"><th align="left" class="cellrowborder" valign="top" width="24.87%" id="mcps1.3.7.2.6.2.1.2.3.1.1"><p id="ddm_06_0017__p10417112762314">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="75.13%" id="mcps1.3.7.2.6.2.1.2.3.1.2"><p id="ddm_06_0017__p4417172715233">Description</p>
@ -29,6 +29,7 @@
<tr id="ddm_06_0017__row8417172719237"><td class="cellrowborder" valign="top" width="24.87%" headers="mcps1.3.7.2.6.2.1.2.3.1.1 "><p id="ddm_06_0017__p1941772722315">Destination Data Nodes</p>
</td>
<td class="cellrowborder" valign="top" width="75.13%" headers="mcps1.3.7.2.6.2.1.2.3.1.2 "><p id="ddm_06_0017__p441719279239">Select the RDS for MySQL instances that have completed PITR. DDM will match the selected data nodes with shard information in the selected metadata backup.</p>
<p id="ddm_06_0017__p3802721124213">For details about how to perform PITR on RDS for MySQL instances, see <a href="https://docs.otc.t-systems.com/relational-database-service/umn/working_with_rds_for_mysql/backups_and_restorations/restoring_a_db_instance_to_a_point_in_time.html" target="_blank" rel="noopener noreferrer">Restoring a DB Instance to a Point in Time</a>.</p>
</td>
</tr>
</tbody>
@ -36,7 +37,7 @@
</div>
</p></li><li id="ddm_06_0017__li160757161013"><span>Click <strong id="ddm_06_0017__b4545118193711">OK</strong>. If a message is displayed indicating that the metadata is restored successfully, the restoration is complete.</span></li></ol>
</div>
<div class="section" id="ddm_06_0017__section132806221525"><a name="ddm_06_0017__section132806221525"></a><a name="section132806221525"></a><h4 class="sectiontitle">Restoring Metadata Using Backups</h4><ol id="ddm_06_0017__ol5281162245210"><li id="ddm_06_0017__li106372611521"><span>Log in to the DDM console.</span></li><li id="ddm_06_0017__li881143742017"><a name="ddm_06_0017__li881143742017"></a><a name="li881143742017"></a><span><a href="ddm_06_0132.html">Create a new DDM instance</a> and use it as the destination DDM instance. For details, see<a href="ddm_06_0132.html">Creating a DDM Instance</a>.</span></li><li id="ddm_06_0017__li2065410461265"><span>In the DDM instance list, locate the source instance and click its name.</span></li><li id="ddm_06_0017__li1828118220524"><span>In the navigation pane on the left, choose <strong id="ddm_06_0017__b8953192322212">Backups</strong>. Alternatively, go to the instance details page and choose <strong id="ddm_06_0017__b1295319237225">Backups</strong> in the navigation pane on the left.</span></li><li id="ddm_06_0017__li1528112265210"><span>Locate the required backup based on the instance name and backup time and click <strong id="ddm_06_0017__b137151723143718">Restore</strong> in the <strong id="ddm_06_0017__b1371519233371">Operation</strong> column.</span><p><p id="ddm_06_0017__p42821322165212"></p>
<div class="section" id="ddm_06_0017__section132806221525"><a name="ddm_06_0017__section132806221525"></a><a name="section132806221525"></a><h4 class="sectiontitle">Restoring Metadata Using Backups</h4><ol id="ddm_06_0017__ol5281162245210"><li id="ddm_06_0017__li106372611521"><span>Log in to the DDM console.</span></li><li id="ddm_06_0017__li881143742017"><a name="ddm_06_0017__li881143742017"></a><a name="li881143742017"></a><span><a href="ddm_06_0132.html">Create a new DDM instance</a> and use it as the destination DDM instance. For details, see <a href="ddm_06_0132.html">Creating a DDM Instance</a>.</span></li><li id="ddm_06_0017__li2065410461265"><span>In the DDM instance list, locate the source instance and click its name.</span></li><li id="ddm_06_0017__li1828118220524"><span>In the navigation pane on the left, choose <strong id="ddm_06_0017__b8953192322212">Backups</strong>. Alternatively, go to the instance details page and choose <strong id="ddm_06_0017__b1295319237225">Backups</strong> in the navigation pane on the left.</span></li><li id="ddm_06_0017__li1528112265210"><span>Locate the required backup based on the instance name and backup time and click <strong id="ddm_06_0017__b137151723143718">Restore</strong> in the <strong id="ddm_06_0017__b1371519233371">Operation</strong> column.</span><p><p id="ddm_06_0017__p42821322165212"></p>
</p></li><li id="ddm_06_0017__li10282152255212"><span>On the displayed page, configure required parameters.</span><p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="ddm_06_0017__table5752162417313" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Parameter description</caption><thead align="left"><tr id="ddm_06_0017__row13753624163111"><th align="left" class="cellrowborder" valign="top" width="26.26%" id="mcps1.3.8.2.6.2.1.2.3.1.1"><p id="ddm_06_0017__p3753192410319">Parameter</p>
</th>
@ -57,6 +58,7 @@
<tr id="ddm_06_0017__row7753524143120"><td class="cellrowborder" valign="top" width="26.26%" headers="mcps1.3.8.2.6.2.1.2.3.1.1 "><p id="ddm_06_0017__p10753824153111">Destination Data Nodes</p>
</td>
<td class="cellrowborder" valign="top" width="73.74000000000001%" headers="mcps1.3.8.2.6.2.1.2.3.1.2 "><p id="ddm_06_0017__p375342483120">Select the RDS for MySQL instances that have completed PITR. DDM will match the selected data nodes with shard information in the selected metadata backup.</p>
<p id="ddm_06_0017__p3244414373">For details about how to perform PITR on RDS for MySQL instances, see <a href="https://docs.otc.t-systems.com/relational-database-service/umn/working_with_rds_for_mysql/backups_and_restorations/restoring_a_db_instance_to_a_point_in_time.html" target="_blank" rel="noopener noreferrer">Restoring a DB Instance to a Point in Time</a>.</p>
</td>
</tr>
</tbody>

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<h1 class="topictitle1">Account Permissions</h1>
<div id="body0000001142093626"><p id="ddm_12_0002__p15609163215619">DDM permissions management is based on MySQL permissions management. DDM supports most of MySQL syntax and permissions. For more information about MySQL accounts and permissions, see <a href="https://dev.mysql.com/doc/refman/5.7/en/access-control.html" target="_blank" rel="noopener noreferrer">MySQL documentation</a>.</p>
<p id="ddm_12_0002__p1791825495916">This document describes DDM account rules, permission levels, permission items, and permission operations.</p>
<div class="note" id="ddm_12_0002__note1844851819115"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="ddm_12_0002__p245221812117">DDM Accounts created by CREATE USER or GRANT have nothing to do with accounts in associated RDS instances, and will not be synchronized to RDS instances either.</p>
</div></div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="ddm_05_0020.html">Managing Permissions</a></div>
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<h1 class="topictitle1">Account Requirements</h1>
<div id="body0000001141571578"><div class="section" id="ddm_12_0003__section1490895514220"><h4 class="sectiontitle">Account</h4><p id="ddm_12_0003__p56101328563">Different from MySQL, DDM identifies an account by username, not by username@host.</p>
</div>
<div class="section" id="ddm_12_0003__section821383116319"><h4 class="sectiontitle">Username</h4><ul id="ddm_12_0003__ul1761013211562"><li id="ddm_12_0003__li861093210563">Must be case-sensitive.</li><li id="ddm_12_0003__li2610203245615">Contains 1 to 32 characters and must start with a letter. Only letters, digits, and underscores (_) are allowed.</li></ul>
</div>
<div class="section" id="ddm_12_0003__section1629416171062"><h4 class="sectiontitle">Password</h4><ul id="ddm_12_0003__ul0610832165619"><li id="ddm_12_0003__li96101432195610">Contains 8 to 32 characters.</li><li id="ddm_12_0003__li5610183213568">Must contain at least three of the following character types: uppercase letters, lowercase letters, digits, and special characters ~!@#%^*-_+?</li><li id="ddm_12_0003__li361017329564">Cannot be a weak password that is easily guessed.</li></ul>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="ddm_05_0020.html">Managing Permissions</a></div>
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