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Wang , Deng Ke
519944c837
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Wang , Deng Ke <wangdengke2@huawei.com> Co-committed-by: Wang , Deng Ke <wangdengke2@huawei.com>
66 lines
5.7 KiB
HTML
66 lines
5.7 KiB
HTML
<a name="dds_02_0002"></a><a name="dds_02_0002"></a>
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<h1 class="topictitle1">Restrictions</h1>
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<div id="body1522808547321"><p id="dds_02_0002__p48042784123325">To improve the stability and security of DB instances, there are some restrictions on the use of DDS. For details, see <a href="#dds_02_0002__table60364850123535">Table 1</a>.</p>
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<div class="tablenoborder"><a name="dds_02_0002__table60364850123535"></a><a name="table60364850123535"></a><table cellpadding="4" cellspacing="0" summary="" id="dds_02_0002__table60364850123535" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Function restrictions</caption><thead align="left"><tr id="dds_02_0002__row63835418123535"><th align="left" class="cellrowborder" valign="top" width="27.26%" id="mcps1.3.2.2.3.1.1"><p id="dds_02_0002__p3286360123535"><strong id="dds_02_0002__b29577244123535">Operation</strong></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_02_0002__p46946588123535"><strong id="dds_02_0002__b842352706171539">Restrictions</strong></p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="dds_02_0002__row65651390123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p16162334123535">Connecting to a DB instance through a client</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_02_0002__ul53814073144559"><li id="dds_02_0002__li109347144559">To access a <span class="keyword" id="dds_02_0002__keyword159551725101016">DDS DB instance</span> which is not publicly accessible from an ECS, the instance must be in the same VPC subnet as the ECS.</li><li id="dds_02_0002__li46337654144559">By default, DDS cannot be accessed through an ECS in a different security group. You need to add an inbound rule to the DDS security group.</li><li id="dds_02_0002__li29581666144559">The default DDS port number is 8635. You can change it if you want to access DDS through another port.</li></ul>
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</td>
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</tr>
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<tr id="dds_02_0002__row53074217123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__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_02_0002__p41829298123535">ECSs 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_02_0002__row60017787123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__p29602599123535">Obtaining permissions of user <strong id="dds_02_0002__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_02_0002__p738283513565">Only the <strong id="dds_02_0002__en-us_topic_0105284934_b84235270694322">rwuser</strong> user permissions are provided on the instance creation page.</p>
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<p id="dds_02_0002__p1716401218589">For details about the related commands, see <a href="dds_faq_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_02_0002__row62985361123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__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_02_0002__p3859309423"></p>
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<p id="dds_02_0002__p159333074217"></p>
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<p id="dds_02_0002__p109814306422">Most database parameters in the parameter groups you created can be modified. For details, see section <a href="en-us_topic_configuration.html">Editing a Parameter Group</a>.</p>
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<p id="dds_02_0002__p51021730164220"></p>
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</td>
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</tr>
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<tr id="dds_02_0002__row19812839123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__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_02_0002__p52021072133834">You can use command line tools, including mongoexport and mongoimport, to migrate data. 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_02_0002__row18357798134159"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__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_02_0002__p2528698134215">The WiredTiger storage engine is supported.</p>
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</td>
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</tr>
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<tr id="dds_02_0002__row43544108123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__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_02_0002__p41132837123535">A DDS DB instance must be restarted on the DDS console.</p>
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</td>
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</tr>
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<tr id="dds_02_0002__row27804808123535"><td class="cellrowborder" valign="top" width="27.26%" headers="mcps1.3.2.2.3.1.1 "><p id="dds_02_0002__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_02_0002__p63693518173">You can download and view the backup 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="dds_02_cluster.html">Getting Started with Clusters</a></div>
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</div>
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</div>
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