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Wang , Deng Ke
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Reviewed-by: Boka, Ladislav <ladislav.boka@t-systems.com> Co-authored-by: Wang , Deng Ke <wangdengke2@huawei.com> Co-committed-by: Wang , Deng Ke <wangdengke2@huawei.com>
41 lines
3.4 KiB
HTML
41 lines
3.4 KiB
HTML
<a name="rds_01_0016"></a><a name="rds_01_0016"></a>
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<h1 class="topictitle1">DB Instance Types</h1>
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<div id="body1536225136020"><p id="rds_01_0016__p189931623204119">The smallest management unit of RDS is the DB instance. A DB instance is an isolated database environment on the cloud. Each DB instance can contain multiple user-created databases, and you can access a DB instance using the same tools and applications that you use with a stand-alone DB instance. You can create and modify DB instances using the management console or APIs. <span id="rds_01_0016__text477383718488">RDS</span> does not have limits on the number of running DB instances. Each DB instance has a DB instance identifier.</p>
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<p id="rds_01_0016__en-us_topic_0086557038_p8060118">DB instances are classified into the following types.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="rds_01_0016__table15359933192816" frame="border" border="1" rules="all"><caption><b>Table 1 </b>DB instance types</caption><thead align="left"><tr id="rds_01_0016__row18406163372818"><th align="left" class="cellrowborder" valign="top" width="35.04%" id="mcps1.3.3.2.3.1.1"><p id="rds_01_0016__p9406153315282"><strong id="rds_01_0016__b1345123092020">DB Instance Type</strong></p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="64.96%" id="mcps1.3.3.2.3.1.2"><p id="rds_01_0016__p11406133318280"><strong id="rds_01_0016__b0714929133514">Description</strong></p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="rds_01_0016__row1440643352814"><td class="cellrowborder" valign="top" width="35.04%" headers="mcps1.3.3.2.3.1.1 "><p id="rds_01_0016__p6406153315285">Single</p>
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</td>
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<td class="cellrowborder" valign="top" width="64.96%" headers="mcps1.3.3.2.3.1.2 "><p id="rds_01_0016__p18406183319282">Uses a single-node architecture. More cost-effective than primary/standby DB instances.</p>
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</td>
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</tr>
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<tr id="rds_01_0016__row1940683372810"><td class="cellrowborder" valign="top" width="35.04%" headers="mcps1.3.3.2.3.1.1 "><p id="rds_01_0016__p12406933152811">Primary/Standby</p>
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</td>
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<td class="cellrowborder" valign="top" width="64.96%" headers="mcps1.3.3.2.3.1.2 "><p id="rds_01_0016__p140673310286">Uses an HA architecture with one master node and one slave node. The instance classes of the nodes are the same.</p>
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</td>
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</tr>
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<tr id="rds_01_0016__row18734173515424"><td class="cellrowborder" valign="top" width="35.04%" headers="mcps1.3.3.2.3.1.1 "><p id="rds_01_0016__p13734935104216">Read replica</p>
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</td>
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<td class="cellrowborder" valign="top" width="64.96%" headers="mcps1.3.3.2.3.1.2 "><p id="rds_01_0016__p573417357429">Uses a single-node architecture (without a standby node).</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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<p id="rds_01_0016__p10788141265417">RDS for SQL Server 2019 Enterprise Edition and 2017 Enterprise Edition support read replicas.</p>
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<p id="rds_01_0016__a7472f2a2bb3643c39f5de90e0bcd5aa2">You can use <span id="rds_01_0016__text4195055204820">RDS</span> to create and manage DB instances running various DB engines.</p>
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<p id="rds_01_0016__p1517016484507">For details about differences and function comparison between different instance types, see <a href="rds_01_0010.html">DB Instance Introduction</a> and <a href="rds_00_0011.html">Function Comparison</a>.</p>
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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="rds_01_0028.html">DB Instance Description</a></div>
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</div>
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</div>
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