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dds_umn

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Reviewed-by: Székely, Ond <ond.szekely@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
2025-08-26 07:59:46 +00:00
committed by zuul
parent b9f4932025
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<a name="dds_01_0014"></a><a name="dds_01_0014"></a>
<h1 class="topictitle1">Database Engine and Version</h1>
<div id="body51595365"><p id="dds_01_0014__p1104614194219">DDS supports versions 3.4, 4.0, 4.2, and 4.4, and you need to use a driver compatible with MongoDB 3.0 or later to access DDS. You can select the DB engine and version you need based on your service requirements.</p>
<div id="body51595365"><p id="dds_01_0014__p1104614194219">DDS supports versions 4.0, 4.2, 4.4 and 5.0, and you need to use a driver compatible with MongoDB 3.0 or later to access DDS. You can select the DB engine and version you need based on your service requirements.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="dds_01_0014__table1023535171419" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Supported DB engines and versions</caption><thead align="left"><tr id="dds_01_0014__row32362518143"><th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.4.1.1"><p id="dds_01_0014__p32363541412">Compatibility</p>
</th>
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</th>
</tr>
</thead>
<tbody><tr id="dds_01_0014__row1518562685217"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="dds_01_0014__p1097892735211">4.4</p>
<tbody><tr id="dds_01_0014__row126841219193616"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="dds_01_0014__p10117727123620">5.0</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><ul id="dds_01_0014__ul12117192733614"><li id="dds_01_0014__li2117142715362">Cluster</li><li id="dds_01_0014__li7117102711361">Replica set</li></ul>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="dds_01_0014__p1711718274368">RocksDB</p>
</td>
</tr>
<tr id="dds_01_0014__row1518562685217"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="dds_01_0014__p1097892735211">4.4</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><ul id="dds_01_0014__ul39781927185218"><li id="dds_01_0014__li1497816276526">Cluster</li><li id="dds_01_0014__li12979162735211">Replica set</li><li id="dds_01_0014__li112931655141515">Single</li></ul>
</td>
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="dds_01_0014__p5243951103114">WiredTiger</p>
</td>
</tr>
<tr id="dds_01_0014__row447143513402"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.1 "><p id="dds_01_0014__p4471835114010">3.4</p>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.2 "><ul id="dds_01_0014__ul564615594511"><li id="dds_01_0014__li464610512459">Cluster</li><li id="dds_01_0014__li164614524512">Replica set</li><li id="dds_01_0014__li146918316167">Single</li></ul>
</td>
<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.4.1.3 "><p id="dds_01_0014__p10275410124511">WiredTiger</p>
</td>
</tr>
</tbody>
</table>
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<h1 class="topictitle1">Mapping Between DDS Versions and Community Versions</h1>
<div id="body0000001788749566"><p id="dds_01_0060__p4701154121918">Document Database Service (DDS) is a cloud database service compatible with MongoDB. DDS major versions select community versions that have not reached EOL and have new major functions as candidate versions for compatibility. The DDS version does not correspond to the community version. To help you understand the mapping between DDS versions and community versions, DDS uses compatible community versions. For details, see <a href="#dds_01_0060__fig12011574199">Figure 1</a>.</p>
<div class="fignone" id="dds_01_0060__fig12011574199"><a name="dds_01_0060__fig12011574199"></a><a name="fig12011574199"></a><span class="figcap"><b>Figure 1 </b>Mapping between DDS versions and community versions</span><br><span><img id="dds_01_0060__image1509575191" src="en-us_image_0000001835388741.png"></span></div>
<ul id="dds_01_0060__ul17510626131918"><li id="dds_01_0060__li477934015614">DDS 3.4 and 4.0 are developed based on the corresponding community versions. The implementation of the same interface is consistent with that in the community. Compared with a community version, DDS has higher security and more O&amp;M functions. DDS can better meet commercial application requirements.</li><li id="dds_01_0060__li11495223242">After October 16, 2018, DDS 4.0 uses the community version 4.0.3 as the baseline version. New features are independently developed and evolved.</li><li id="dds_01_0060__li7385113016249">DDS 4.2 and later versions use the community version 4.0.3 as the baseline version. New features are independently developed and evolved. The storage engine is switched to RocksDB to provide better user experience.</li><li id="dds_01_0060__li15570137132416">DDS source code has been opened in the GitHub community. For details, see <a href="https://github.com/hwCloudDBSDDS/dds" target="_blank" rel="noopener noreferrer">https://github.com/hwCloudDBSDDS/dds</a>.</li></ul>
<div class="fignone" id="dds_01_0060__fig12011574199"><a name="dds_01_0060__fig12011574199"></a><a name="fig12011574199"></a><span class="figcap"><b>Figure 1 </b>Mapping between DDS versions and community versions</span><br><span><img id="dds_01_0060__image20334131982519" src="en-us_image_0000002378611730.png"></span></div>
<ul id="dds_01_0060__ul17510626131918"><li id="dds_01_0060__li477934015614">DDS 4.0 are developed based on the corresponding community versions. The implementation of the same interface is consistent with that in the community. Compared with a community version, DDS has higher security and more O&amp;M functions. DDS can better meet commercial application requirements.</li><li id="dds_01_0060__li11495223242">After October 16, 2018, DDS 4.0 uses the community version 4.0.3 as the baseline version. New features are independently developed and evolved.</li><li id="dds_01_0060__li7385113016249">DDS 4.2 and later versions use the community version 4.0.3 as the baseline version. New features are independently developed and evolved. The storage engine is switched to RocksDB to provide better user experience.</li><li id="dds_01_0060__li15570137132416">DDS source code has been opened in the GitHub community. For details, see <a href="https://github.com/hwCloudDBSDDS/dds" target="_blank" rel="noopener noreferrer">https://github.com/hwCloudDBSDDS/dds</a>.</li></ul>
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<h1 class="topictitle1">Version Information</h1>
<div id="body0000002075386360"><p id="dds_01_0061__p4701154121918">Document Database Service (DDS) is a MongDB-compatible cloud database service that is secure, high available, and reliable. It provides DB instance creation, scaling, disaster recovery, backup, restoration, monitoring, and alarm reporting functions with just a few clicks on the DDS console.</p>
<div class="section" id="dds_01_0061__section15371539409"><h4 class="sectiontitle">Release Notes</h4><p id="dds_01_0061__p149441110409">DDS is compatible with community versions 3.4, 4.0, 4.2 and 4.4. For details, see <a href="dds_01_0060.html">Mapping Between DDS Versions and Community Versions</a>.</p>
<div class="section" id="dds_01_0061__section15371539409"><h4 class="sectiontitle">Release Notes</h4><p id="dds_01_0061__p149441110409">DDS is compatible with community versions 4.0, 4.2, 4.4 and 5.0. For details, see <a href="dds_01_0060.html">Mapping Between DDS Versions and Community Versions</a>.</p>
</div>
<div class="section" id="dds_01_0061__section18694113413"><h4 class="sectiontitle">Lifecycle Planning of DDS Versions</h4><div class="note" id="dds_01_0061__note996492216412"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dds_01_0061__ul12503165583617"><li id="dds_01_0061__li6503145511363">End of Marketing (EOM): indicates that the sale of this version is stopped.</li><li id="dds_01_0061__li1350325513615">End of Service &amp; Support (EOS): indicates that the service of this version is stopped. You are advised to use the engine of the latest version when running jobs. </li></ul>
</div></div>
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</tr>
<tr id="dds_01_0061__row163726327425"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.1 "><p id="dds_01_0061__p971115514431">3.4</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.2 "><p id="dds_01_0061__p137117554435">Commercial use</p>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.2 "><p id="dds_01_0061__p348762394612">Unavailable</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.3 "><p id="dds_01_0061__p771145574317">February 2020</p>
</td>
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<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.4 "><p id="dds_01_0061__p18717556436">April 2029</p>
</td>
</tr>
<tr id="dds_01_0061__row18461131516431"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.1 "><p id="dds_01_0061__p1711355154320">5.0</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.2 "><p id="dds_01_0061__p342412681117">Commercial use</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.3 "><p id="dds_01_0061__p1771205510436">N/A</p>
</td>
<td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.3.3.2.5.1.4 "><p id="dds_01_0061__p157114559430">N/A</p>
</td>
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</div>
<div class="section" id="dds_02_0006__section12950115493212"><h4 class="sectiontitle">Prerequisites</h4><ol id="dds_02_0006__ol3246193120481"><li id="dds_02_0006__li157944426489"><a href="dds_02_0046.html">Bind an EIP</a> to the cluster instance and <a href="dds_02_0019.html">set security group rules</a> to ensure that the EIP can be accessed with the DB client application.</li><li id="dds_02_0006__li1166891112506">Install the MongoDB client or Robo 3T.<p id="dds_02_0006__p117191137520"><a name="dds_02_0006__li1166891112506"></a><a name="li1166891112506"></a><strong id="dds_02_0006__b109142212262">MongoDB client</strong></p>
<ol type="a" id="dds_02_0006__ol135814209524"><li id="dds_02_0006__li1258020155214">For details on how to create and log in to an ECS, see "Creating and Logging In to a Windows ECS" or "Creating and Logging In to a Linux ECS" in the <em id="dds_02_0006__i102641425142618">Elastic Cloud Server User Guide</em>.</li><li id="dds_02_0006__li1369583718523">Install the MongoDB client on the <span id="dds_02_0006__text169821124175219">ECS</span><span id="dds_02_0006__text1798242413528"></span>.<p id="dds_02_0006__p1760103735017">For details on how to install a MongoDB client, see <a href="dds_faq_0018.html">How Can I Install a MongoDB Client?</a></p>
<div class="note" id="dds_02_0006__note11972884015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_02_0006__p093280409">If you use a <a href="#dds_02_0006__li122297367491">connection address</a> to connect to a cluster instance, download the MongoDB client of version later than 3.4.</p>
<div class="note" id="dds_02_0006__note11972884015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_02_0006__p093280409">If you use a <a href="#dds_02_0006__li122297367491">connection address</a> to connect to a cluster instance, download the MongoDB client of version later than 4.0.</p>
</div></div>
</li></ol>
<p id="dds_02_0006__p1334835714533"><strong id="dds_02_0006__b101452013144419">Robo 3T</strong></p>

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</tr>
<tr id="dds_02_0012__row1024495916243"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0012__p2453532616243">Compatible MongoDB Version</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0012__ul5930101454918"><li id="dds_02_0012__li182621429184410">4.4</li><li id="dds_02_0012__li19412134617810">4.2</li><li id="dds_02_0012__li12282171919">4.0</li><li id="dds_02_0012__li557634017166">3.4</li></ul>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0012__ul5930101454918"><li id="dds_02_0012__li134421756171315">5.0</li><li id="dds_02_0012__li182621429184410">4.4</li><li id="dds_02_0012__li19412134617810">4.2</li><li id="dds_02_0012__li12282171919">4.0</li></ul>
</td>
</tr>
<tr id="dds_02_0012__row17502122118245"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0012__p101132286218">Storage Type</p>
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</tr>
<tr id="dds_02_0012__row319181316237"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0012__p1672886816349">Storage Engine</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0012__ul109418294235"><li id="dds_02_0012__li8942142922318">WiredTiger<p id="dds_02_0012__p11175126192414"><a name="dds_02_0012__li8942142922318"></a><a name="li8942142922318"></a>WiredTiger is the default storage engine of DDS 3.4 and 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0012__ul109418294235"><li id="dds_02_0012__li8942142922318">WiredTiger<p id="dds_02_0012__p11175126192414"><a name="dds_02_0012__li8942142922318"></a><a name="li8942142922318"></a>WiredTiger is the default storage engine of DDS 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
</li><li id="dds_02_0012__li19723447162416">RocksDB<p id="dds_02_0012__p3871944172517"><a name="dds_02_0012__li19723447162416"></a><a name="li19723447162416"></a>RocksDB is the default storage engine of DDS 4.2 and 4.4. RocksDB supports efficient point lookup, range scan, and high-speed write. RocksDB can be used as the underlying data storage engine of DDS and is suitable for scenarios with a large number of write operations.</p>
</li></ul>
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</tr>
<tr id="dds_02_0016__en-us_topic_0044018333_row1024495916243"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0016__en-us_topic_0044018333_p2453532616243">Compatible MongoDB Version</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0016__en-us_topic_0044018333_ul5930101454918"><li id="dds_02_0016__en-us_topic_0044018333_li423032584214">4.4</li><li id="dds_02_0016__en-us_topic_0044018333_li20191144116712">4.2</li><li id="dds_02_0016__en-us_topic_0044018333_li12282171919">4.0</li><li id="dds_02_0016__en-us_topic_0044018333_li557634017166">3.4</li></ul>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0016__en-us_topic_0044018333_ul5930101454918"><li id="dds_02_0016__en-us_topic_0044018333_li860231716145">5.0</li><li id="dds_02_0016__en-us_topic_0044018333_li423032584214">4.4</li><li id="dds_02_0016__en-us_topic_0044018333_li20191144116712">4.2</li><li id="dds_02_0016__en-us_topic_0044018333_li12282171919">4.0</li></ul>
</td>
</tr>
<tr id="dds_02_0016__en-us_topic_0044018333_row11127281528"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0016__en-us_topic_0044018333_p101132286218">Storage Type</p>
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</tr>
<tr id="dds_02_0016__en-us_topic_0044018333_row319181316237"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0016__en-us_topic_0044018333_p1672886816349">Storage Engine</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0016__en-us_topic_0044018333_ul109418294235"><li id="dds_02_0016__en-us_topic_0044018333_li8942142922318">WiredTiger<p id="dds_02_0016__en-us_topic_0044018333_p11175126192414"><a name="dds_02_0016__en-us_topic_0044018333_li8942142922318"></a><a name="en-us_topic_0044018333_li8942142922318"></a>WiredTiger is the default storage engine of DDS 3.4 and 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0016__en-us_topic_0044018333_ul109418294235"><li id="dds_02_0016__en-us_topic_0044018333_li8942142922318">WiredTiger<p id="dds_02_0016__en-us_topic_0044018333_p11175126192414"><a name="dds_02_0016__en-us_topic_0044018333_li8942142922318"></a><a name="en-us_topic_0044018333_li8942142922318"></a>WiredTiger is the default storage engine of DDS 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
</li><li id="dds_02_0016__en-us_topic_0044018333_li19723447162416">RocksDB<p id="dds_02_0016__en-us_topic_0044018333_p3871944172517"><a name="dds_02_0016__en-us_topic_0044018333_li19723447162416"></a><a name="en-us_topic_0044018333_li19723447162416"></a>RocksDB is the default storage engine of DDS 4.2 and 4.4. RocksDB supports efficient point lookup, range scan, and high-speed write. RocksDB can be used as the underlying data storage engine of DDS and is suitable for scenarios with a large number of write operations.</p>
</li></ul>
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</tr>
<tr id="dds_02_0023__row1024495916243"><td class="cellrowborder" valign="top" width="21.05%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0023__p2453532616243">Compatible MongoDB Version</p>
</td>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0023__ul5930101454918"><li id="dds_02_0023__li276595264410">4.4</li><li id="dds_02_0023__li1643551918913">4.2</li><li id="dds_02_0023__li12282171919">4.0</li><li id="dds_02_0023__li557634017166">3.4</li></ul>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0023__ul5930101454918"><li id="dds_02_0023__li276595264410">4.4</li><li id="dds_02_0023__li1643551918913">4.2</li><li id="dds_02_0023__li12282171919">4.0</li></ul>
</td>
</tr>
<tr id="dds_02_0023__row329012273519"><td class="cellrowborder" valign="top" width="21.05%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0023__p101132286218">Storage Type</p>
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</tr>
<tr id="dds_02_0023__row319181316237"><td class="cellrowborder" valign="top" width="21.05%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0023__p1672886816349">Storage Engine</p>
</td>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0023__ul109418294235"><li id="dds_02_0023__li8942142922318">WiredTiger<p id="dds_02_0023__p11175126192414"><a name="dds_02_0023__li8942142922318"></a><a name="li8942142922318"></a>WiredTiger is the default storage engine of DDS 3.4 and 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0023__ul109418294235"><li id="dds_02_0023__li8942142922318">WiredTiger<p id="dds_02_0023__p11175126192414"><a name="dds_02_0023__li8942142922318"></a><a name="li8942142922318"></a>WiredTiger is the default storage engine of DDS 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
</li><li id="dds_02_0023__li19723447162416">RocksDB<p id="dds_02_0023__p3871944172517"><a name="dds_02_0023__li19723447162416"></a><a name="li19723447162416"></a>RocksDB is the default storage engine of DDS 4.2 and 4.4. RocksDB supports efficient point lookup, range scan, and high-speed write. RocksDB can be used as the underlying data storage engine of DDS and is suitable for scenarios with a large number of write operations.</p>
</li></ul>
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</tr>
<tr id="dds_02_0052__dds_02_0012_row1024495916243"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0052__dds_02_0012_p2453532616243">Compatible MongoDB Version</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0052__dds_02_0012_ul5930101454918"><li id="dds_02_0052__dds_02_0012_li182621429184410">4.4</li><li id="dds_02_0052__dds_02_0012_li19412134617810">4.2</li><li id="dds_02_0052__dds_02_0012_li12282171919">4.0</li><li id="dds_02_0052__dds_02_0012_li557634017166">3.4</li></ul>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0052__dds_02_0012_ul5930101454918"><li id="dds_02_0052__dds_02_0012_li134421756171315">5.0</li><li id="dds_02_0052__dds_02_0012_li182621429184410">4.4</li><li id="dds_02_0052__dds_02_0012_li19412134617810">4.2</li><li id="dds_02_0052__dds_02_0012_li12282171919">4.0</li></ul>
</td>
</tr>
<tr id="dds_02_0052__dds_02_0012_row17502122118245"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0052__dds_02_0012_p101132286218">Storage Type</p>
@ -49,7 +49,7 @@
</tr>
<tr id="dds_02_0052__dds_02_0012_row319181316237"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0052__dds_02_0012_p1672886816349">Storage Engine</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0052__dds_02_0012_ul109418294235"><li id="dds_02_0052__dds_02_0012_li8942142922318">WiredTiger<p id="dds_02_0052__dds_02_0012_p11175126192414"><a name="dds_02_0052__dds_02_0012_li8942142922318"></a><a name="dds_02_0012_li8942142922318"></a>WiredTiger is the default storage engine of DDS 3.4 and 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0052__dds_02_0012_ul109418294235"><li id="dds_02_0052__dds_02_0012_li8942142922318">WiredTiger<p id="dds_02_0052__dds_02_0012_p11175126192414"><a name="dds_02_0052__dds_02_0012_li8942142922318"></a><a name="dds_02_0012_li8942142922318"></a>WiredTiger is the default storage engine of DDS 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
</li><li id="dds_02_0052__dds_02_0012_li19723447162416">RocksDB<p id="dds_02_0052__dds_02_0012_p3871944172517"><a name="dds_02_0052__dds_02_0012_li19723447162416"></a><a name="dds_02_0012_li19723447162416"></a>RocksDB is the default storage engine of DDS 4.2 and 4.4. RocksDB supports efficient point lookup, range scan, and high-speed write. RocksDB can be used as the underlying data storage engine of DDS and is suitable for scenarios with a large number of write operations.</p>
</li></ul>
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</tr>
<tr id="dds_02_0079__dds_02_0023_row1024495916243"><td class="cellrowborder" valign="top" width="21.05%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0079__dds_02_0023_p2453532616243">Compatible MongoDB Version</p>
</td>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0079__dds_02_0023_ul5930101454918"><li id="dds_02_0079__dds_02_0023_li276595264410">4.4</li><li id="dds_02_0079__dds_02_0023_li1643551918913">4.2</li><li id="dds_02_0079__dds_02_0023_li12282171919">4.0</li><li id="dds_02_0079__dds_02_0023_li557634017166">3.4</li></ul>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0079__dds_02_0023_ul5930101454918"><li id="dds_02_0079__dds_02_0023_li276595264410">4.4</li><li id="dds_02_0079__dds_02_0023_li1643551918913">4.2</li><li id="dds_02_0079__dds_02_0023_li12282171919">4.0</li></ul>
</td>
</tr>
<tr id="dds_02_0079__dds_02_0023_row329012273519"><td class="cellrowborder" valign="top" width="21.05%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0079__dds_02_0023_p101132286218">Storage Type</p>
@ -49,7 +49,7 @@
</tr>
<tr id="dds_02_0079__dds_02_0023_row319181316237"><td class="cellrowborder" valign="top" width="21.05%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0079__dds_02_0023_p1672886816349">Storage Engine</p>
</td>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0079__dds_02_0023_ul109418294235"><li id="dds_02_0079__dds_02_0023_li8942142922318">WiredTiger<p id="dds_02_0079__dds_02_0023_p11175126192414"><a name="dds_02_0079__dds_02_0023_li8942142922318"></a><a name="dds_02_0023_li8942142922318"></a>WiredTiger is the default storage engine of DDS 3.4 and 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
<td class="cellrowborder" valign="top" width="78.95%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0079__dds_02_0023_ul109418294235"><li id="dds_02_0079__dds_02_0023_li8942142922318">WiredTiger<p id="dds_02_0079__dds_02_0023_p11175126192414"><a name="dds_02_0079__dds_02_0023_li8942142922318"></a><a name="dds_02_0023_li8942142922318"></a>WiredTiger is the default storage engine of DDS 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
</li><li id="dds_02_0079__dds_02_0023_li19723447162416">RocksDB<p id="dds_02_0079__dds_02_0023_p3871944172517"><a name="dds_02_0079__dds_02_0023_li19723447162416"></a><a name="dds_02_0023_li19723447162416"></a>RocksDB is the default storage engine of DDS 4.2 and 4.4. RocksDB supports efficient point lookup, range scan, and high-speed write. RocksDB can be used as the underlying data storage engine of DDS and is suitable for scenarios with a large number of write operations.</p>
</li></ul>
</td>

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<p id="dds_02_0100__p8060118">This section describes how to obtain the IP addresses of the shard and config nodes.</p>
</div>
<div class="section" id="dds_02_0100__section12401231171410"><h4 class="sectiontitle">Before You Start</h4>
<ul id="dds_02_0100__ul4988173651419"><li id="dds_02_0100__li1998863631415">DDS supports cluster instances of Community Edition 3.4, 4.0, 4.2, and 4.4.</li><li id="dds_02_0100__li1592812169159">DDS creates two connection addresses for the primary node and secondary node in a shard respectively.</li><li id="dds_02_0100__li185401621134812">Once the connection addresses are assigned to your nodes, they cannot be modified or deleted.</li><li id="dds_02_0100__li2029351134917">The connection address is accessible from private networks only.</li></ul>
<ul id="dds_02_0100__ul4988173651419"><li id="dds_02_0100__li1998863631415">DDS supports cluster instances of Community Edition 4.0, 4.2, and 4.4.</li><li id="dds_02_0100__li1592812169159">DDS creates two connection addresses for the primary node and secondary node in a shard respectively.</li><li id="dds_02_0100__li185401621134812">Once the connection addresses are assigned to your nodes, they cannot be modified or deleted.</li><li id="dds_02_0100__li2029351134917">The connection address is accessible from private networks only.</li></ul>
</div>
<div class="section" id="dds_02_0100__section1748562461319"><h4 class="sectiontitle">Enabling shard IP Address</h4><ol id="dds_02_0100__ol1398481335019"><li id="dds_02_0100__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_02_0100__li131998252507"><span>In the left navigation pane, choose <strong id="dds_02_0100__b861910318543">Instance Management</strong>. In the DB instance list, click the target cluster instance to go to the <strong id="dds_02_0100__b125916259573">Basic Information</strong> page.</span><p><p id="dds_02_0100__p8381616162115">Alternatively, on the <strong id="dds_02_0100__b1143415103214">Basic Information</strong> page, in the navigation pane on the left, click <strong id="dds_02_0100__b1143441019216">Connections</strong>.</p>
</p></li><li id="dds_02_0100__li43511328145214"><span>In the <strong id="dds_02_0100__b1229016301215">Node Information</strong> area, click the <strong id="dds_02_0100__b8501189584">shard</strong> tab.</span></li><li id="dds_02_0100__li49993266574"><span>Click <strong id="dds_02_0100__b595113381837">Show shard IP Address</strong>. In the displayed dialog box, enter and confirm the password for connecting to the node.</span><p><div class="note" id="dds_02_0100__note208751820518"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dds_02_0100__ul12635132165"><li id="dds_02_0100__li069911215337">After the shard IP address is enabled, you need to restart the corresponding shard nodes for the configuration to take effect.</li><li id="dds_02_0100__li1635135162">The shard IP address cannot be modified or disabled after being enabled, and the password cannot be modified.</li><li id="dds_02_0100__li18623131513167">After the shard IP address is enabled and new shard nodes are added, you need to manually locate the newly added shard node and choose <strong id="dds_02_0100__b15262232682">More</strong> &gt; <strong id="dds_02_0100__b1740319356814">Show shard IP Address</strong> in the <strong id="dds_02_0100__b20216638885">Operation</strong> column to show the shard IP address.</li><li id="dds_02_0100__li94923381716">After the shard IP address is enabled, all shard nodes in the current instance apply for connection addresses.</li></ul>

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<a name="dds_03_0062"></a><a name="dds_03_0062"></a>
<h1 class="topictitle1">Permissions Management</h1>
<div id="body1559613116010"><p id="dds_03_0062__p8060118"></p>
</div>
<div id="body1559613116010"></div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="dds_03_0060.html">Creating a User and Granting Permissions</a></strong><br>

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</th>
</tr>
</thead>
<tbody><tr id="dds_change_history__row7875453123119"><td class="cellrowborder" valign="top" width="24.62%" headers="mcps1.3.1.1.3.1.1 "><p id="dds_change_history__p178768533313">2022-10-30</p>
<tbody><tr id="dds_change_history__row17442720191716"><td class="cellrowborder" valign="top" width="24.62%" headers="mcps1.3.1.1.3.1.1 "><p id="dds_change_history__p7442920131718">2025-08-08</p>
</td>
<td class="cellrowborder" valign="top" width="75.38%" headers="mcps1.3.1.1.3.1.2 "><p id="dds_change_history__p56113408173">Added the following content:</p>
<p id="dds_change_history__p137861543181717"><a href="dds_01_0046.html">Versions</a></p>
</td>
</tr>
<tr id="dds_change_history__row04931543701"><td class="cellrowborder" valign="top" width="24.62%" headers="mcps1.3.1.1.3.1.1 "><p id="dds_change_history__p144939433011">2025-07-08</p>
</td>
<td class="cellrowborder" valign="top" width="75.38%" headers="mcps1.3.1.1.3.1.2 "><p id="dds_change_history__p8493043505">Added support of DDS version 5.0.</p>
</td>
</tr>
<tr id="dds_change_history__row7875453123119"><td class="cellrowborder" valign="top" width="24.62%" headers="mcps1.3.1.1.3.1.1 "><p id="dds_change_history__p178768533313">2022-10-30</p>
</td>
<td class="cellrowborder" valign="top" width="75.38%" headers="mcps1.3.1.1.3.1.2 "><p id="dds_change_history__p14897181153319">Modified the following content:</p>
<ul id="dds_change_history__ul31732016101116"><li id="dds_change_history__li101741916191119"><a href="dds_01_0026.html">DB Instance Status</a></li><li id="dds_change_history__li1117416167118"><a href="dds_03_0030.html">Changing a Single Node DB Instance Class</a></li></ul>

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<a name="dds_faq_0018"></a><a name="dds_faq_0018"></a>
<h1 class="topictitle1">How Can I Install a MongoDB Client?</h1>
<div id="body8662426"><p id="dds_faq_0018__p6437338416538">MongoDB official website provides client installation packages for different OSs. Download the official binary installation package at <a href="https://www.mongodb.com/download-center#community" target="_blank" rel="noopener noreferrer">https://www.mongodb.com/download-center#community</a>.</p>
<p id="dds_faq_0018__p18375732718">The following uses Red Hat Linux 7 and MongoDB 3.4.0 as examples to describe how to obtain the required installation package and install the MongoDB client.</p>
<div class="section" id="dds_faq_0018__s613b2088cd51405f85d7ff84f71612f4"><h4 class="sectiontitle">Procedure</h4><ol id="dds_faq_0018__o22bb62848f044ba78ddcc8d04b2a2633"><li id="dds_faq_0018__li19040286173627"><span>Obtain the installation package.</span><p><ol type="a" id="dds_faq_0018__ol5149115918032"><li id="dds_faq_0018__li501597610266">Log in at <a href="https://www.mongodb.com/download-center/community" target="_blank" rel="noopener noreferrer">https://www.mongodb.com/download-center/community</a>.</li><li id="dds_faq_0018__li3770190218032">Choose <strong id="dds_faq_0018__b6720121031917">Server</strong>, select <strong id="dds_faq_0018__b20721171011915">RHEL 7.0 Linux 64-bit x64</strong> for <strong id="dds_faq_0018__b1723141061910">OS</strong>, and click <strong id="dds_faq_0018__b57241210191918">All version binaries</strong>. <a href="#dds_faq_0018__fig129943125910">Figure 1</a> shows an example.<div class="fignone" id="dds_faq_0018__fig129943125910"><a name="dds_faq_0018__fig129943125910"></a><a name="fig129943125910"></a><span class="figcap"><b>Figure 1 </b>MongoDB official webpage</span><br><span><img id="dds_faq_0018__image203371024183013" src="en-us_image_0000001096453900.png"></span></div>
</li><li id="dds_faq_0018__li3762697918032">Open the downloading page, click <span class="filepath" id="dds_faq_0018__filepath074313102618"><b>linux/mongodb-linux-x86_64-rhel70-3.4.0.tgz</b></span> to download the binary installation package of MongoDB 3.4.0. <a href="#dds_faq_0018__fig12339163313218">Figure 2</a> shows an example.<div class="fignone" id="dds_faq_0018__fig12339163313218"><a name="dds_faq_0018__fig12339163313218"></a><a name="fig12339163313218"></a><span class="figcap"><b>Figure 2 </b>Downloading page</span><br><span><img id="dds_faq_0018__image18924193033717" src="en-us_image_0000001142893909.png"></span></div>
<div id="body8662426"><p id="dds_faq_0018__p6437338416538">MongoDB official website provides client installation packages for different OSs. Download the official package at <a href="https://www.mongodb.com/try/download/community" target="_blank" rel="noopener noreferrer">https://www.mongodb.com/try/download/community</a>.</p>
<div class="notice" id="dds_faq_0018__note134901054185218"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><ul id="dds_faq_0018__ul16881449122912"><li id="dds_faq_0018__li12881114915294">The following uses <span class="parmvalue" id="dds_faq_0018__parmvalue127634175515"><b>RedHat/CentOS 8.0 ×64</b></span> and MongoDB 5.0.28 as examples to describe how to obtain the required installation package and install the MongoDB client.</li><li id="dds_faq_0018__li1088115491291">During the installation, select a client version that matches the instance version based on the actual operating system.</li></ul>
</div></div>
<div class="section" id="dds_faq_0018__section1679163475310"><h4 class="sectiontitle">Procedure</h4><ol id="dds_faq_0018__o22bb62848f044ba78ddcc8d04b2a2633"><li id="dds_faq_0018__li19040286173627"><span>Obtain the installation package.</span><p><ol type="a" id="dds_faq_0018__ol5149115918032"><li id="dds_faq_0018__li501597610266">Visit the <a href="https://www.mongodb.com/try/download/community" target="_blank" rel="noopener noreferrer">MongoDB official website</a>.</li><li id="dds_faq_0018__li68694315512">Select version <strong id="dds_faq_0018__b176382724310">5.0.28</strong>, platform <strong id="dds_faq_0018__b16922715436">RedHat/CentOS 8.0 ×64</strong>, and package <strong id="dds_faq_0018__b17013275437">tgz</strong>. <a href="#dds_faq_0018__fig646895910135">Figure 1</a> shows an example.<div class="fignone" id="dds_faq_0018__fig646895910135"><a name="dds_faq_0018__fig646895910135"></a><a name="fig646895910135"></a><span class="figcap"><b>Figure 1 </b>MongoDB official web page</span><br><span><img id="dds_faq_0018__image2046875961318" src="en-us_image_0000002412372785.png"></span></div>
</li><li id="dds_faq_0018__li837112344328">Use either of the following methods to upload the installation package to the ECS:<div class="note" id="dds_faq_0018__note97626018372"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_faq_0018__p197635093711">For details about how to log in to an ECS, see <a href="dds_faq_0034.html">How Can I Create and Log In to an ECS?</a></p>
</div></div>
<ul id="dds_faq_0018__ul13562105420362"><li id="dds_faq_0018__li456215541368">Click <strong id="dds_faq_0018__b7148158113218">Download</strong> to obtain the binary installation package of version 5.0.28. The name of the installation package is <strong id="dds_faq_0018__b809516346">mongodb-linux-x86_64-rhel80-5.0.28.tgz</strong>. Upload the installation package to the ECS.</li><li id="dds_faq_0018__li1556218545366">Click <strong id="dds_faq_0018__b423343911347">Copy link</strong> to obtain the download address. Log in to the ECS and run the <strong id="dds_faq_0018__b1968819118358">wget </strong><em id="dds_faq_0018__i1890101413518">copylink</em> command.<div class="note" id="dds_faq_0018__note853151016410"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_faq_0018__p353115101048">Replace <em id="dds_faq_0018__i1232313153515">copylink</em> with the actual download address.</p>
</div></div>
</li></ul>
</li></ol>
</p></li><li id="dds_faq_0018__li1793594932020"><span>Upload the installation package to the <span id="dds_faq_0018__text148221416114916">ECS</span><span id="dds_faq_0018__text817721915493"></span>. For details about how to log in to an <span id="dds_faq_0018__text627532914495">ECS</span><span id="dds_faq_0018__text6275162984915"></span>.</span></li><li id="dds_faq_0018__li12107812234"><span>Decompress the installation package on the <span id="dds_faq_0018__text1721163616498">ECS</span><span id="dds_faq_0018__text9211173674912"></span>.</span><p><p id="dds_faq_0018__p5766646112515"><strong id="dds_faq_0018__b207667460257">tar zxvf mongodb-linux-x86_64-rhel70-3.4.0.tgz</strong></p>
</p></li><li id="dds_faq_0018__li1348614349232"><span>Obtain the client tool from the <span class="filepath" id="dds_faq_0018__filepath10227920908"><b>bin</b></span> directory of the installation package.</span><p><p id="dds_faq_0018__p98325533411"><strong id="dds_faq_0018__b43611193342">cd mongodb-linux-x86_64-rhel70-3.4.0/bin</strong></p>
</p></li><li id="dds_faq_0018__li12107812234"><span>Decompress the installation package on the ECS.</span><p><p id="dds_faq_0018__p5766646112515"><strong id="dds_faq_0018__b36391825155312">tar zxvf mongodb-</strong><em id="dds_faq_0018__i873522725311">linux-x86_64-rhel80-5.0.28</em><strong id="dds_faq_0018__b263972595312">.tgz</strong></p>
<div class="note" id="dds_faq_0018__note15657451135320"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_faq_0018__p865816511534">Replace the installation package name with the actual one.</p>
</div></div>
</p></li><li id="dds_faq_0018__li1348614349232"><span>Access the <span class="filepath" id="dds_faq_0018__filepath44002407182911"><b>bin</b></span> directory where the installation package is located.</span><p><p id="dds_faq_0018__p98325533411"><strong id="dds_faq_0018__b6825153885313">cd mongodb-</strong><em id="dds_faq_0018__i3669133915317">linux-x86_64-rhel80-5.0.28</em><strong id="dds_faq_0018__b5825163825315">/bin</strong></p>
<div class="note" id="dds_faq_0018__note1997843405416"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="dds_faq_0018__p497918346547">Replace the installation package name with the actual one.</p>
</div></div>
<p id="dds_faq_0018__p10884134616314">The common tools are as follows:</p>
<ul id="dds_faq_0018__ul6885134623118"><li id="dds_faq_0018__li17885246143114">MongoDB client mongo</li><li id="dds_faq_0018__li1688534620310">Data export tool mongoexport</li><li id="dds_faq_0018__li1388594616316">Data import tool mongoimport</li></ul>
</p></li><li id="dds_faq_0018__li646501155938"><span>Before using a client tool, assign the execute permission to it.</span><p><ul id="dds_faq_0018__ul186071740145218"><li id="dds_faq_0018__li9607174018521">Run the <strong id="dds_faq_0018__b19497131185">chmod +x mongo</strong> command to grant a client permission to connect to a DB instance.</li><li id="dds_faq_0018__li106071540185212">Run the <strong id="dds_faq_0018__b48411643161113">chmod +x mongoexport</strong> command to grant a client permission to export data.</li><li id="dds_faq_0018__li14607164014520">Run the <strong id="dds_faq_0018__b849335410116">chmod +x mongoimport</strong> command to grant a client permission to import data.</li></ul>
</p></li><li id="dds_faq_0018__li16148655171418"><span>Connect to a DB instance through the installed client.</span><p><ul id="dds_faq_0018__ul17445161912155"><li id="dds_faq_0018__li18445191913154">For details on how to connect to a cluster instance, see <a href="en-us_topic_0044018334.html">Connecting to a Cluster Instance Over Private Networks</a>.</li><li id="dds_faq_0018__li596820432293">For details on how to connect to a replica set instance, see <a href="en-us_topic_0105284966.html">Connecting to a Replica Set Instance Over Private Networks</a>.</li><li id="dds_faq_0018__li96205243153">For details on how to connect to a single node instance, see <a href="dds_02_0028.html">Connecting to a Single Node Instance Over Private Networks</a>.</li></ul>
</p></li><li id="dds_faq_0018__li646501155938"><span>Make the packages executable.</span><p><ul id="dds_faq_0018__ul186071740145218"><li id="dds_faq_0018__li9607174018521">Run the <strong id="dds_faq_0018__b19497131185">chmod +x mongo</strong> command to grant a client permission to connect to an instance.</li><li id="dds_faq_0018__li106071540185212">Run the <strong id="dds_faq_0018__b48411643161113">chmod +x mongoexport</strong> command to grant a client permission to export data.</li><li id="dds_faq_0018__li14607164014520">Run the <strong id="dds_faq_0018__b849335410116">chmod +x mongoimport</strong> command to grant a client permission to import data.</li></ul>
</p></li><li id="dds_faq_0018__li16148655171418"><span>Connect to an instance through the installed client.</span><p><ul id="dds_faq_0018__ul17445161912155"><li id="dds_faq_0018__li18445191913154">To connect to a cluster instance, see <a href="dds_02_0009.html">Connecting to a Cluster Instance Over Private Networks</a>.</li><li id="dds_faq_0018__li596820432293">To connect to a replica set instance, see <a href="dds_02_0055.html">Connecting to a Replica Set Instance Over Private Networks</a>.</li><li id="dds_faq_0018__li96205243153">To connect to a single node instance, see <a href="dds_02_0074.html">Connecting to a Single-Node Instance Over Private Networks</a>.</li></ul>
</p></li></ol>
</div>
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<a name="dds_faq_0034"></a><a name="dds_faq_0034"></a>
<h1 class="topictitle1">How Do I Create and Log In to an <span id="text1496585620456">ECS</span>?</h1>
<div id="body1511576893188"><p id="dds_faq_0034__p6710695410621">For details on how to create and log in to an ECS, see "Creating and Logging In to a Windows ECS" or "Creating and Logging In to a Linux ECS" in the <em id="dds_faq_0034__i84235269795846">Elastic Cloud Server User Guide</em>.</p>
<ul id="dds_faq_0034__ul13610800174526"><li id="dds_faq_0034__li55388343174526">The ECS to be created must be in the same VPC with the DDS DB instance to which it connects.</li><li id="dds_faq_0034__li37311331294">When you create an ECS, select an OS, such as Red Hat 6.6, and bind an EIP to it.</li><li id="dds_faq_0034__li45674921174526">Configure the security group to enable the ECS to access the DB instance through the private IP address, that is, the node address in the <strong id="dds_faq_0034__b842352706161357">Private IP Address</strong> column on the <strong id="dds_faq_0034__b84235270616144">Basic Information</strong> page.</li></ul>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_faq_0104.html">Database Connection</a></div>
</div>
</div>

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</li>
<li class="ulchildlink"><strong><a href="dds_faq_0015.html">What Should I Do If a DDS Server Problem Causes a Connection Failure?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_faq_0034.html">How Do I Create and Log In to an ECS?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_faq_0018.html">How Can I Install a MongoDB Client?</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_faq_0039.html">How Do I Install Robo 3T?</a></strong><br>

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</tr>
<tr id="en-us_topic_0044018333__row1024495916243"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="en-us_topic_0044018333__p2453532616243">Compatible MongoDB Version</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="en-us_topic_0044018333__ul5930101454918"><li id="en-us_topic_0044018333__li423032584214">4.4</li><li id="en-us_topic_0044018333__li20191144116712">4.2</li><li id="en-us_topic_0044018333__li12282171919">4.0</li><li id="en-us_topic_0044018333__li557634017166">3.4</li></ul>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="en-us_topic_0044018333__ul5930101454918"><li id="en-us_topic_0044018333__li860231716145">5.0</li><li id="en-us_topic_0044018333__li423032584214">4.4</li><li id="en-us_topic_0044018333__li20191144116712">4.2</li><li id="en-us_topic_0044018333__li12282171919">4.0</li></ul>
</td>
</tr>
<tr id="en-us_topic_0044018333__row11127281528"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="en-us_topic_0044018333__p101132286218">Storage Type</p>
@ -49,7 +49,7 @@
</tr>
<tr id="en-us_topic_0044018333__row319181316237"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="en-us_topic_0044018333__p1672886816349">Storage Engine</p>
</td>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="en-us_topic_0044018333__ul109418294235"><li id="en-us_topic_0044018333__li8942142922318">WiredTiger<p id="en-us_topic_0044018333__p11175126192414"><a name="en-us_topic_0044018333__li8942142922318"></a><a name="li8942142922318"></a>WiredTiger is the default storage engine of DDS 3.4 and 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="en-us_topic_0044018333__ul109418294235"><li id="en-us_topic_0044018333__li8942142922318">WiredTiger<p id="en-us_topic_0044018333__p11175126192414"><a name="en-us_topic_0044018333__li8942142922318"></a><a name="li8942142922318"></a>WiredTiger is the default storage engine of DDS 4.0. WiredTiger provides different granularity concurrency control and compression mechanism for data management. It can provide the best performance and storage efficiency for different kinds of applications.</p>
</li><li id="en-us_topic_0044018333__li19723447162416">RocksDB<p id="en-us_topic_0044018333__p3871944172517"><a name="en-us_topic_0044018333__li19723447162416"></a><a name="li19723447162416"></a>RocksDB is the default storage engine of DDS 4.2 and 4.4. RocksDB supports efficient point lookup, range scan, and high-speed write. RocksDB can be used as the underlying data storage engine of DDS and is suitable for scenarios with a large number of write operations.</p>
</li></ul>
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<div class="section" id="en-us_topic_0044018334__section13607142219913"><h4 class="sectiontitle">Constraints</h4><p id="en-us_topic_0044018334__p181210271492">For details about constraints on connecting to a DB instance, see <a href="dds_01_0022.html">Constraints and Recommendations</a>.</p>
</div>
<div class="section" id="en-us_topic_0044018334__section12950115493212"><h4 class="sectiontitle">Prerequisites</h4><ol id="en-us_topic_0044018334__ol134821154847"><li id="en-us_topic_0044018334__li1258020155214">For details on how to create and log in to an ECS, see "Creating and Logging In to a Windows ECS" or "Creating and Logging In to a Linux ECS" in the <em id="en-us_topic_0044018334__i84235269795846">Elastic Cloud Server User Guide</em>.</li><li id="en-us_topic_0044018334__li155435381355">Install the MongoDB client on the <span id="en-us_topic_0044018334__text1111610289251">ECS</span><span id="en-us_topic_0044018334__text111712852510"></span>.<p id="en-us_topic_0044018334__p15162131654014">For details on how to install a MongoDB client, see <a href="dds_faq_0018.html">How Can I Install a MongoDB Client?</a></p>
<div class="note" id="en-us_topic_0044018334__note11972884015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0044018334__p093280409">If you use a <a href="#en-us_topic_0044018334__li122297367491">connection address</a> to connect to a cluster instance, download the MongoDB client of version later than 3.4.</p>
<div class="note" id="en-us_topic_0044018334__note11972884015"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="en-us_topic_0044018334__p093280409">If you use a <a href="#en-us_topic_0044018334__li122297367491">connection address</a> to connect to a cluster instance, download the MongoDB client of version later than 4.0.</p>
</div></div>
</li></ol>
</div>
@ -26,7 +26,7 @@
<pre class="screen" id="en-us_topic_0044018334__screen1055614111419">Enter password:</pre>
</li><li id="en-us_topic_0044018334__li1055161412145">Method 2: Using standard URI format.<pre class="codeblock" id="en-us_topic_0044018334__codeblock17584840141010"><strong id="en-us_topic_0044018334__b19585140101013">mong</strong><strong id="en-us_topic_0044018334__b15585104019109">o m</strong><strong id="en-us_topic_0044018334__b12585640171010">ongodb://rwuser:&lt;password&gt;@</strong><em id="en-us_topic_0044018334__i45853408101">&lt;</em><em id="en-us_topic_0044018334__i1858594018107">DB_HOST</em><em id="en-us_topic_0044018334__i12585194019108">&gt;</em><strong id="en-us_topic_0044018334__b145851740161018">:</strong><em id="en-us_topic_0044018334__i55851440191010">&lt;</em><em id="en-us_topic_0044018334__i6585194018105">DB_PORT</em><em id="en-us_topic_0044018334__i1058504010101">&gt;</em><strong id="en-us_topic_0044018334__b95858403104">,</strong><em id="en-us_topic_0044018334__i1558594017101">&lt;</em><em id="en-us_topic_0044018334__i75851940131013">DB_HOST</em><em id="en-us_topic_0044018334__i3585124051013">&gt;</em><strong id="en-us_topic_0044018334__b125851240111010">:</strong><em id="en-us_topic_0044018334__i135859401109">&lt;</em><em id="en-us_topic_0044018334__i458514013108">DB_PORT</em><em id="en-us_topic_0044018334__i14585134041012">&gt;</em><strong id="en-us_topic_0044018334__b1858584019104">/test?authSource=admin</strong> <strong id="en-us_topic_0044018334__b1058516407101">--ssl --sslCAFile</strong> <em id="en-us_topic_0044018334__i1658574014108">&lt;</em><em id="en-us_topic_0044018334__i5585740191013">FILE_PATH</em><em id="en-us_topic_0044018334__i9585164071010">&gt;</em> <strong id="en-us_topic_0044018334__b1058584071018">--sslAllowInvalidHostnames</strong></pre>
<p id="en-us_topic_0044018334__p15541153864316">The connection information can be obtained in the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol193163119165"><b>Address</b></span> column on the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol46471843163"><b>Instance Management</b></span> page.</p>
<p id="en-us_topic_0044018334__p15852132744319">A connection address indicates that one of the dds mongos nodes will be randomly connected. If you use this method to connect to a DB instance, use the MongoDB client of version later than 3.4.</p>
<p id="en-us_topic_0044018334__p15852132744319">A connection address indicates that one of the dds mongos nodes will be randomly connected. If you use this method to connect to a DB instance, use the MongoDB client of version later than 4.0.</p>
</li></ul>
<div class="note" id="en-us_topic_0044018334__note1957314131416"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0044018334__ul115731415143"><li id="en-us_topic_0044018334__li558131419149"><strong id="en-us_topic_0044018334__b226713556815">DB_HOST</strong> indicates the IP address of the remotely connected DB instance. Obtain the value from the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol3268155285"><b>Private IP Address</b></span> column in the node list on the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol32682055989"><b>Connections</b></span> page.</li><li id="en-us_topic_0044018334__li195811411416"><strong id="en-us_topic_0044018334__b078034553719">DB_PORT</strong> indicates the port number. Obtain the value from <span class="uicontrol" id="en-us_topic_0044018334__uicontrol1478194573714"><b>Database Port</b></span> in the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol1278344510379"><b>Basic Information</b></span> area on the <strong id="en-us_topic_0044018334__b13818121210417">Connections</strong> page.</li><li id="en-us_topic_0044018334__li845117911471"><strong id="en-us_topic_0044018334__b1645111915477">DB_HOST</strong> and<strong id="en-us_topic_0044018334__b11451591474"> DB_PORT</strong> can also be obtained from the Node Information area on the Basic Information page.</li><li id="en-us_topic_0044018334__li15581214101417"><strong id="en-us_topic_0044018334__b18302125815169">DB_USER</strong> indicates the database account name. The default value is <strong id="en-us_topic_0044018334__b7303155851610">rwuser</strong>.</li><li id="en-us_topic_0044018334__li3589131519216"><strong id="en-us_topic_0044018334__b14590015122110"><em id="en-us_topic_0044018334__i1959014152219">&lt;password&gt;</em></strong> indicates the password of the database account. If the password contains at signs (@),exclamation marks (!), or percent signs (%), replace them with hexadecimal URL codes %40, %21, and %25 respectively.</li><li id="en-us_topic_0044018334__li122761750202211">If user inputs this command then the password will be stored in logfiles and can be found in linux history, and in process list. So please note that plaintext passwords are risky.</li><li id="en-us_topic_0044018334__li85813148148"><strong id="en-us_topic_0044018334__b84235270618026">FILE_PATH</strong> indicates the path where the root certificate is stored.</li></ul>
</div></div>
@ -43,7 +43,7 @@
<pre class="screen" id="en-us_topic_0044018334__screen9370437195515">Enter password:</pre>
</li><li id="en-us_topic_0044018334__li122297367491"><a name="en-us_topic_0044018334__li122297367491"></a><a name="li122297367491"></a>Method 2: Using standard URI format<pre class="codeblock" id="en-us_topic_0044018334__codeblock1147233819111"><strong id="en-us_topic_0044018334__b174818387112">mongo</strong> <strong id="en-us_topic_0044018334__b248112384114">mongodb://rwuser:</strong>&lt;password&gt;<strong id="en-us_topic_0044018334__b154811238161118">@</strong><em id="en-us_topic_0044018334__i44815382116">&lt;</em><em id="en-us_topic_0044018334__i44811238131117">DB_HOST</em><em id="en-us_topic_0044018334__i1481193814112">1&gt;</em><strong id="en-us_topic_0044018334__b4481838131119">:</strong><em id="en-us_topic_0044018334__i19481193811111">&lt;</em><em id="en-us_topic_0044018334__i648116380116">DB_PORT</em><em id="en-us_topic_0044018334__i44811938111117">1&gt;</em><strong id="en-us_topic_0044018334__b2481538141112">,</strong><em id="en-us_topic_0044018334__i1348114387116"><em id="en-us_topic_0044018334__i15481638121120">&lt;</em><em id="en-us_topic_0044018334__i18481123817116">DB_HOST</em><em id="en-us_topic_0044018334__i13481838161111">2&gt;</em></em><strong id="en-us_topic_0044018334__b248111388116">:</strong><em id="en-us_topic_0044018334__i174814389115"><em id="en-us_topic_0044018334__i1948193814110">&lt;</em><em id="en-us_topic_0044018334__i18481183891116">DB_PORT</em><em id="en-us_topic_0044018334__i14481203817116">2&gt;</em></em><strong id="en-us_topic_0044018334__b15481193811115">/test?authSource=admin</strong></pre>
<p id="en-us_topic_0044018334__p1083104710171">The connection information can be obtained in the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol1375182011312"><b>Address</b></span> column on the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol937792093113"><b>Instance Management</b></span> page.</p>
<p id="en-us_topic_0044018334__p1118564314176">A connection address indicates that one of the dds mongos nodes will be randomly connected. If you use this method to connect to a DB instance, use the MongoDB client of version later than 3.4.</p>
<p id="en-us_topic_0044018334__p1118564314176">A connection address indicates that one of the dds mongos nodes will be randomly connected. If you use this method to connect to a DB instance, use the MongoDB client of version later than 4.0.</p>
</li></ul>
<div class="note" id="en-us_topic_0044018334__note21381431122218"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="en-us_topic_0044018334__ul18138931152220"><li id="en-us_topic_0044018334__li8735051125619"><strong id="en-us_topic_0044018334__b1798202832120">DB_HOST</strong> indicates the IP address of the remotely connected DB instance. Obtain the value from the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol1798492892118"><b>Private IP Address</b></span> column in the node list on the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol298415283213"><b>Connections</b></span> page.</li><li id="en-us_topic_0044018334__li9743125175616"><strong id="en-us_topic_0044018334__b1785319082219">DB_PORT</strong> indicates the port number. Obtain the value from <span class="uicontrol" id="en-us_topic_0044018334__uicontrol88537032216"><b>Database Port</b></span> in the <span class="uicontrol" id="en-us_topic_0044018334__uicontrol08545011223"><b>Basic Information</b></span> area on the <strong id="en-us_topic_0044018334__b1985513018225">Connections</strong> page.</li><li id="en-us_topic_0044018334__li1784422195514"><strong id="en-us_topic_0044018334__b1721511785612">DB_HOST</strong> and<strong id="en-us_topic_0044018334__b6356141555618"> DB_PORT</strong> can also be obtained from the Node Information area on the Basic Information page.</li><li id="en-us_topic_0044018334__li10747135112566"><strong id="en-us_topic_0044018334__b208201423151716">DB_USER</strong> indicates the database account name. The default value is <strong id="en-us_topic_0044018334__b48209236172">rwuser</strong>.</li><li id="en-us_topic_0044018334__li39416434266"><strong id="en-us_topic_0044018334__b1951543172615"><em id="en-us_topic_0044018334__i1595174312610">&lt;password&gt;</em></strong> indicates the password of the database account. If the password contains at signs (@),exclamation marks (!), or percent signs (%), replace them with hexadecimal URL codes %40, %21, and %25 respectively.</li><li id="en-us_topic_0044018334__li155958442267">If user inputs this command then the password will be stored in logfiles and can be found in linux history, and in process list. So please note that plaintext passwords are risky.</li></ul>
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<li class="ulchildlink"><strong><a href="dds_01_0015.html">Typical Application Scenarios</a></strong><br>
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