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dds_umn

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Reviewed-by: Boka, Ladislav <ladislav.boka@t-systems.com>
Co-authored-by: Ru, Li Yi <liyiru7@huawei.com>
Co-committed-by: Ru, Li Yi <liyiru7@huawei.com>
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Ru, Li Yi 2024-02-29 12:55:06 +00:00 committed by zuul
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<a name="dds_01_0060"></a><a name="dds_01_0060"></a>
<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>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
</div>
</div>

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<tr id="dds_02_0012__row41307396112018"><td class="cellrowborder" valign="top" width="26%" headers="mcps1.3.2.2.3.2.1.2.3.1.1 "><p id="dds_02_0012__p57564751112018">Disk Encryption</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__ul133881550588"><li id="dds_02_0012__li2388145105810"><strong id="dds_02_0012__b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0012__li47064331556"><strong id="dds_02_0012__b84235270610302">Enabled</strong>: Enable the encryption function. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0012__p1950185719127"><strong id="dds_02_0012__b842352706103156">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
<div class="note" id="dds_02_0012__note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0012__en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0012__en-us_topic_0044018333_li262221314310">After a DB instance is created, the disk encryption status and the key cannot be changed. The backup data stored in <span id="dds_02_0012__en-us_topic_0044018333_text13846195816121"></span><span id="dds_02_0012__en-us_topic_0044018333_text89517421315">OBS</span> is not encrypted.</li><li id="dds_02_0012__en-us_topic_0044018333_li158613010413">The key cannot be disabled or deleted when being used. Otherwise, the database becomes unavailable.</li><li id="dds_02_0012__en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0012__en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
<td class="cellrowborder" valign="top" width="74%" headers="mcps1.3.2.2.3.2.1.2.3.1.2 "><ul id="dds_02_0012__ul133881550588"><li id="dds_02_0012__li2388145105810"><strong id="dds_02_0012__b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0012__li52191547135210"><strong id="dds_02_0012__b150747644695932">Enabled</strong>: Enable encryption. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0012__p172191947135211"><strong id="dds_02_0012__b54342102195932">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
</li></ul>
<div class="note" id="dds_02_0012__note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0012__ul1362121393110"><li id="dds_02_0012__li1156124454620">After an instance is created, the disk encryption status and the key cannot be changed. The backup data stored in OBS is encrypted.</li><li id="dds_02_0012__li845663616343">To check whether the disk is encrypted, you can view <strong id="dds_02_0012__b21996298184">Disk Encrypted</strong> in the DB instance list.</li><li id="dds_02_0012__li16886718103912">If disk encryption or backup data encryption is enabled, keep the key properly. Once the key is disabled, deleted, or frozen, the database will be unavailable and data may not be restored.</li><li id="dds_02_0012__li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0012__i84235269720595">Key Management Service User Guide</em>.</li></ul>
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<tr id="dds_02_0016__en-us_topic_0044018333_row48121472104319"><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_p5525166104319">Disk Encryption</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_ul133881550588"><li id="dds_02_0016__en-us_topic_0044018333_li2388145105810"><strong id="dds_02_0016__en-us_topic_0044018333_b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0016__en-us_topic_0044018333_li47064331556"><strong id="dds_02_0016__en-us_topic_0044018333_b6660771592">Enabled</strong>: Enable the encryption function. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0016__en-us_topic_0044018333_p1950185719127"><strong id="dds_02_0016__en-us_topic_0044018333_b842352706103156">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
<div class="note" id="dds_02_0016__en-us_topic_0044018333_note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0016__en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0016__en-us_topic_0044018333_li262221314310">After a DB instance is created, the disk encryption status and the key cannot be changed. The backup data stored in <span id="dds_02_0016__en-us_topic_0044018333_text13846195816121"></span><span id="dds_02_0016__en-us_topic_0044018333_text89517421315">OBS</span> is not encrypted.</li><li id="dds_02_0016__en-us_topic_0044018333_li158613010413">The key cannot be disabled or deleted when being used. Otherwise, the database becomes unavailable.</li><li id="dds_02_0016__en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0016__en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
<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_ul133881550588"><li id="dds_02_0016__en-us_topic_0044018333_li2388145105810"><strong id="dds_02_0016__en-us_topic_0044018333_b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0016__en-us_topic_0044018333_li52191547135210"><strong id="dds_02_0016__en-us_topic_0044018333_b150747644695932">Enabled</strong>: Enable encryption. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0016__en-us_topic_0044018333_p172191947135211"><strong id="dds_02_0016__en-us_topic_0044018333_b54342102195932">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
</li></ul>
<div class="note" id="dds_02_0016__en-us_topic_0044018333_note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0016__en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0016__en-us_topic_0044018333_li1156124454620">After an instance is created, the disk encryption status and the key cannot be changed. The backup data stored in OBS is encrypted.</li><li id="dds_02_0016__en-us_topic_0044018333_li845663616343">To check whether the disk is encrypted, you can view <strong id="dds_02_0016__en-us_topic_0044018333_b21996298184">Disk Encrypted</strong> in the DB instance list.</li><li id="dds_02_0016__en-us_topic_0044018333_li16886718103912">If disk encryption or backup data encryption is enabled, keep the key properly. Once the key is disabled, deleted, or frozen, the database will be unavailable and data may not be restored.</li><li id="dds_02_0016__en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0016__en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
</td>
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<tr id="dds_02_0023__row6259484511219"><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__p2648269711219">Disk Encryption</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__ul133881550588"><li id="dds_02_0023__li2388145105810"><strong id="dds_02_0023__b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0023__li47064331556"><strong id="dds_02_0023__b18684115810158">Enabled</strong>: Enable the encryption function. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0023__p1950185719127"><strong id="dds_02_0023__b842352706103156">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
<div class="note" id="dds_02_0023__note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0023__en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0023__en-us_topic_0044018333_li262221314310">After a DB instance is created, the disk encryption status and the key cannot be changed. The backup data stored in <span id="dds_02_0023__en-us_topic_0044018333_text13846195816121"></span><span id="dds_02_0023__en-us_topic_0044018333_text89517421315">OBS</span> is not encrypted.</li><li id="dds_02_0023__en-us_topic_0044018333_li158613010413">The key cannot be disabled or deleted when being used. Otherwise, the database becomes unavailable.</li><li id="dds_02_0023__en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0023__en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
<div class="note" id="dds_02_0023__note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0023__en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0023__en-us_topic_0044018333_li1156124454620">After an instance is created, the disk encryption status and the key cannot be changed. The backup data stored in OBS is encrypted.</li><li id="dds_02_0023__en-us_topic_0044018333_li845663616343">To check whether the disk is encrypted, you can view <strong id="dds_02_0023__en-us_topic_0044018333_b21996298184">Disk Encrypted</strong> in the DB instance list.</li><li id="dds_02_0023__en-us_topic_0044018333_li16886718103912">If disk encryption or backup data encryption is enabled, keep the key properly. Once the key is disabled, deleted, or frozen, the database will be unavailable and data may not be restored.</li><li id="dds_02_0023__en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0023__en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
</li></ul>
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<tr id="dds_02_0052__dds_02_0012_row41307396112018"><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_p57564751112018">Disk Encryption</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_ul133881550588"><li id="dds_02_0052__dds_02_0012_li2388145105810"><strong id="dds_02_0052__dds_02_0012_b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0052__dds_02_0012_li47064331556"><strong id="dds_02_0052__dds_02_0012_b84235270610302">Enabled</strong>: Enable the encryption function. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0052__dds_02_0012_p1950185719127"><strong id="dds_02_0052__dds_02_0012_b842352706103156">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
<div class="note" id="dds_02_0052__dds_02_0012_note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_li262221314310">After a DB instance is created, the disk encryption status and the key cannot be changed. The backup data stored in <span id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_text13846195816121"></span><span id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_text89517421315">OBS</span> is not encrypted.</li><li id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_li158613010413">The key cannot be disabled or deleted when being used. Otherwise, the database becomes unavailable.</li><li id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0052__dds_02_0012_en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
<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_ul133881550588"><li id="dds_02_0052__dds_02_0012_li2388145105810"><strong id="dds_02_0052__dds_02_0012_b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0052__dds_02_0012_li52191547135210"><strong id="dds_02_0052__dds_02_0012_b150747644695932">Enabled</strong>: Enable encryption. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0052__dds_02_0012_p172191947135211"><strong id="dds_02_0052__dds_02_0012_b54342102195932">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
</li></ul>
<div class="note" id="dds_02_0052__dds_02_0012_note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0052__dds_02_0012_ul1362121393110"><li id="dds_02_0052__dds_02_0012_li1156124454620">After an instance is created, the disk encryption status and the key cannot be changed. The backup data stored in OBS is encrypted.</li><li id="dds_02_0052__dds_02_0012_li845663616343">To check whether the disk is encrypted, you can view <strong id="dds_02_0052__dds_02_0012_b21996298184">Disk Encrypted</strong> in the DB instance list.</li><li id="dds_02_0052__dds_02_0012_li16886718103912">If disk encryption or backup data encryption is enabled, keep the key properly. Once the key is disabled, deleted, or frozen, the database will be unavailable and data may not be restored.</li><li id="dds_02_0052__dds_02_0012_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0052__dds_02_0012_i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
</td>
</tr>
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<tr id="dds_02_0079__dds_02_0023_row6259484511219"><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_p2648269711219">Disk Encryption</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_ul133881550588"><li id="dds_02_0079__dds_02_0023_li2388145105810"><strong id="dds_02_0079__dds_02_0023_b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="dds_02_0079__dds_02_0023_li47064331556"><strong id="dds_02_0079__dds_02_0023_b18684115810158">Enabled</strong>: Enable the encryption function. This feature improves data security but slightly affects read/write performance.<p id="dds_02_0079__dds_02_0023_p1950185719127"><strong id="dds_02_0079__dds_02_0023_b842352706103156">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
<div class="note" id="dds_02_0079__dds_02_0023_note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li262221314310">After a DB instance is created, the disk encryption status and the key cannot be changed. The backup data stored in <span id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_text13846195816121"></span><span id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_text89517421315">OBS</span> is not encrypted.</li><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li158613010413">The key cannot be disabled or deleted when being used. Otherwise, the database becomes unavailable.</li><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
<div class="note" id="dds_02_0079__dds_02_0023_note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_ul1362121393110"><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li1156124454620">After an instance is created, the disk encryption status and the key cannot be changed. The backup data stored in OBS is encrypted.</li><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li845663616343">To check whether the disk is encrypted, you can view <strong id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_b21996298184">Disk Encrypted</strong> in the DB instance list.</li><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li16886718103912">If disk encryption or backup data encryption is enabled, keep the key properly. Once the key is disabled, deleted, or frozen, the database will be unavailable and data may not be restored.</li><li id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="dds_02_0079__dds_02_0023_en-us_topic_0044018333_i84235269720595">Key Management Service User Guide</em>.</li></ul>
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</li></ul>
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<tr id="en-us_topic_0044018333__row48121472104319"><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__p5525166104319">Disk Encryption</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__ul133881550588"><li id="en-us_topic_0044018333__li2388145105810"><strong id="en-us_topic_0044018333__b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="en-us_topic_0044018333__li47064331556"><strong id="en-us_topic_0044018333__b6660771592">Enabled</strong>: Enable the encryption function. This feature improves data security but slightly affects read/write performance.<p id="en-us_topic_0044018333__p1950185719127"><strong id="en-us_topic_0044018333__b842352706103156">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
<div class="note" id="en-us_topic_0044018333__note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0044018333__ul1362121393110"><li id="en-us_topic_0044018333__li262221314310">After a DB instance is created, the disk encryption status and the key cannot be changed. The backup data stored in <span id="en-us_topic_0044018333__text13846195816121"></span><span id="en-us_topic_0044018333__text89517421315">OBS</span> is not encrypted.</li><li id="en-us_topic_0044018333__li158613010413">The key cannot be disabled or deleted when being used. Otherwise, the database becomes unavailable.</li><li id="en-us_topic_0044018333__li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="en-us_topic_0044018333__i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
<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__ul133881550588"><li id="en-us_topic_0044018333__li2388145105810"><strong id="en-us_topic_0044018333__b842352706102944">Disabled</strong>: Disable the encryption function.</li><li id="en-us_topic_0044018333__li52191547135210"><strong id="en-us_topic_0044018333__b150747644695932">Enabled</strong>: Enable encryption. This feature improves data security but slightly affects read/write performance.<p id="en-us_topic_0044018333__p172191947135211"><strong id="en-us_topic_0044018333__b54342102195932">Key Name</strong>: Select or create a private key, which is the tenant key.</p>
</li></ul>
<div class="note" id="en-us_topic_0044018333__note2431518191315"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="en-us_topic_0044018333__ul1362121393110"><li id="en-us_topic_0044018333__li1156124454620">After an instance is created, the disk encryption status and the key cannot be changed. The backup data stored in OBS is encrypted.</li><li id="en-us_topic_0044018333__li845663616343">To check whether the disk is encrypted, you can view <strong id="en-us_topic_0044018333__b21996298184">Disk Encrypted</strong> in the DB instance list.</li><li id="en-us_topic_0044018333__li16886718103912">If disk encryption or backup data encryption is enabled, keep the key properly. Once the key is disabled, deleted, or frozen, the database will be unavailable and data may not be restored.</li><li id="en-us_topic_0044018333__li1660761315330">For details about how to create a key, see the "Creating a CMK" section in the <em id="en-us_topic_0044018333__i84235269720595">Key Management Service User Guide</em>.</li></ul>
</div></div>
</td>
</tr>
</tbody>

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<a name="en-us_topic_introduction"></a><a name="en-us_topic_introduction"></a>
<h1 class="topictitle1">What Is DDS?</h1>
<div id="body52215961"><p id="en-us_topic_introduction__p37073266161026">Document Database Service (DDS) is a high availability DBaaS, which provides a secure, reliable and scalable solution, compatible with MongoDB. It provides functions such as one-click deployment, <span class="keyword" id="en-us_topic_introduction__keyword14492131173011">elastic capacity expansion</span>, <span class="keyword" id="en-us_topic_introduction__keyword13656940203011">disaster recovery</span>, backup, restoration, monitoring, and alarm reporting.</p>
<div id="body52215961"><p id="en-us_topic_introduction__p37073266161026">Document Database Service (DDS) is a high availability DBaaS, which provides a secure, reliable and scalable solution, compatible with MongoDB community version 4.0.3 as baseline version.It provides functions such as one-click deployment, <span class="keyword" id="en-us_topic_introduction__keyword14492131173011">elastic capacity expansion</span>, <span class="keyword" id="en-us_topic_introduction__keyword13656940203011">disaster recovery</span>, backup, restoration, monitoring, and alarm reporting.</p>
<p id="en-us_topic_introduction__p65223945161026">DDS has the following features:</p>
<ul id="en-us_topic_introduction__ul50144594161026"><li id="en-us_topic_introduction__li35180331161026">DDS automatically establishes the three-node <span class="keyword" id="en-us_topic_introduction__keyword18736914174216">replica set</span> architecture. It supports fast deployment, <span class="keyword" id="en-us_topic_introduction__keyword93813256425">high availability (HA) data storage</span>, <span class="keyword" id="en-us_topic_introduction__keyword394920308428">data redundancy</span>, and failover.</li><li id="en-us_topic_introduction__li13418762102713">DDS provides sharded cluster instances comprised of a config node paired with multiple shards and mongos nodes. These clusters can be easily scaled up to enhance read and write performance.</li><li id="en-us_topic_introduction__li48187524161026">DDS lets you back up or restore a database from the management console in just a few clicks.</li><li id="en-us_topic_introduction__li5574606710">DDS provides performance metrics and you can configure alarm notifications to make it easier to keep abreast of instance statuses.</li></ul>
<p id="en-us_topic_introduction__p15752318719">For details about the compatible DB engines and versions, see <a href="dds_01_0014.html">Database Engine and Version</a>.</p>

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</li>
<li class="ulchildlink"><strong><a href="dds_01_0016.html">Related Services</a></strong><br>
</li>
<li class="ulchildlink"><strong><a href="dds_01_0060.html">Mapping Between DDS Versions and Community Versions</a></strong><br>
</li>
</ul>
</div>