forked from docs/doc-exports
Ru, Li Yi
cd74617674
Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com> Co-authored-by: Ru, Li Yi <liyiru7@huawei.com> Co-committed-by: Ru, Li Yi <liyiru7@huawei.com>
70 lines
6.2 KiB
HTML
70 lines
6.2 KiB
HTML
<a name="dds_01_0022"></a><a name="dds_01_0022"></a>
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<h1 class="topictitle1">Constraints and Recommendations</h1>
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<div id="body1522808547321"><p id="dds_01_0022__p48042784123325">To improve the stability and security of DB instances, there are some constraints on the use of DDS. For details, see <a href="#dds_01_0022__table60364850123535">Table 1</a>.</p>
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<div class="tablenoborder"><a name="dds_01_0022__table60364850123535"></a><a name="table60364850123535"></a><table cellpadding="4" cellspacing="0" summary="" id="dds_01_0022__table60364850123535" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Function constraints</caption><thead align="left"><tr id="dds_01_0022__row63835418123535"><th align="left" class="cellrowborder" valign="top" width="27.26%" id="mcps1.3.2.2.3.1.1"><p id="dds_01_0022__p3286360123535">Topic</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="72.74000000000001%" id="mcps1.3.2.2.3.1.2"><p id="dds_01_0022__p46946588123535">Constraints</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="dds_01_0022__row65651390123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p16162334123535">Connecting to a DB instance</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><ul id="dds_01_0022__ul53814073144559"><li id="dds_01_0022__li109347144559">When connecting to a DB instance over private networks, bind an EIP to the prepared <span id="dds_01_0022__text20405152124119">ECS</span><span id="dds_01_0022__text0200182784119"></span>.</li><li id="dds_01_0022__li46337654144559">By default, DDS is not accessible from <span id="dds_01_0022__text1154045714412">ECS</span><span id="dds_01_0022__text55401557144113"></span>s that are not in the same security group. If the ECS is not in the same security group, you need to add an inbound rule to enable access.</li><li id="dds_01_0022__li29581666144559">The default DDS port is 8635, but this port can be modified if necessary.</li></ul>
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</td>
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</tr>
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<tr id="dds_01_0022__row53074217123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p4044355123535">Deployment</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p41829298123535">ECS instances in which DB instances are deployed are not visible to you. Your applications can access the database only through an IP address and port.</p>
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</td>
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</tr>
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<tr id="dds_01_0022__row60017787123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p29602599123535">Obtaining permissions of user <strong id="dds_01_0022__b84235270617431">rwuser</strong></p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p738283513565">Only the <strong id="dds_01_0022__en-us_topic_0105284934_b84235270694322">rwuser</strong> user permissions are provided on the instance creation page.</p>
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<p id="dds_01_0022__p1716401218589">For details about the related commands, see <a href="dds_03_0033.html">Which Commands are Supported or Restricted by DDS?</a></p>
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</td>
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</tr>
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<tr id="dds_01_0022__row62985361123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p1540641123535">Setting database parameters</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p3859309423"></p>
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<p id="dds_01_0022__p159333074217"></p>
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<p id="dds_01_0022__p109814306422">Most database parameters in the parameter templates you created can be modified. For details, see section <a href="en-us_topic_configuration.html">Modifying a Parameter Template</a>.</p>
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</td>
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</tr>
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<tr id="dds_01_0022__row19812839123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p61336152123535">Migrating data</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p52021072133834">You can use multiple tools to migrate your data between databases, such as mongoexport and mongoimport. For details, see section <a href="dds_03_0052.html">Migrating Data</a>.</p>
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</td>
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</tr>
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<tr id="dds_01_0022__row18357798134159"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p255375813428">Storage engine</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p2528698134215">DDS supports the WiredTiger storage engine.</p>
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</td>
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</tr>
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<tr id="dds_01_0022__row791814564293"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p0919056182920">Nodes</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p291975622911">dds mongos and shard nodes that are successfully added cannot be deleted.</p>
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</td>
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</tr>
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<tr id="dds_01_0022__row43544108123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p37411822123535">Restarting a DB instance or a node</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p41132837123535">DB instances cannot be restarted using commands. They must be restarted on the management console.</p>
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</td>
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</tr>
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<tr id="dds_01_0022__row27804808123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_01_0022__p37597003123535">Viewing DDS backup files</p>
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</td>
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<td class="cellrowborder" valign="top" width="72.74000000000001%" headers="mcps1.3.2.2.3.1.2 "><p id="dds_01_0022__p63693518173">DDS backups are saved in OBS buckets but these cannot be accessed directly. You can download and view the files on the DDS console. For details, see section <a href="en-us_topic_backup_download.html">Downloading Backup Files</a>.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_user_guide.html">Introduction</a></div>
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</div>
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</div>
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