forked from laiweijian4/doc-exports
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>
15 lines
2.3 KiB
HTML
15 lines
2.3 KiB
HTML
<a name="dds_faq_0001"></a><a name="dds_faq_0001"></a>
|
|
|
|
<h1 class="topictitle1">What Precautions Should Be Taken When Using DDS?</h1>
|
|
<div id="body1482373289559"><ol id="dds_faq_0001__o7244f12f9a6a4dd38c94c0388228d78f"><li id="dds_faq_0001__le237c8c48f134c4184666adefbb59ae1">Failover<p id="dds_faq_0001__a037035a0623e475ba22b0698adb38e45"><a name="dds_faq_0001__le237c8c48f134c4184666adefbb59ae1"></a><a name="le237c8c48f134c4184666adefbb59ae1"></a>DDS uses multiple mongos, replica sets, and shards to ensure data reliability. When a mongos is faulty, the other mongos takes over services immediately to ensure service continuity. A replica set consists of a primary, a secondary, and a hidden node. When the primary node is faulty, <span id="dds_faq_0001__text6561723993225">DDS</span> selects the secondary node as the new primary within 30 seconds.</p>
|
|
</li><li id="dds_faq_0001__li4806839611836">ECSs used for DB instances are invisible to you. Your applications can access the IP addresses and ports corresponding to the database only.</li><li id="dds_faq_0001__li39264403112435">Backup files stored on OBS are invisible to you. They are only visible in the DDS backend management system.</li><li id="dds_faq_0001__lcce8be9140df42d99cb0346cce6cfa45">Precautions after applying for <span id="dds_faq_0001__text35389284315152">DDS</span>:<p id="dds_faq_0001__a5945b0b685024ab394de703a66ccaa6c">After purchasing DDS DB instances, you do not need to perform basic database O&M operations, such as HA and security patches. You need to pay attention to the following:</p>
|
|
<ol type="a" id="dds_faq_0001__ocadf52852e2642a39d01526ea96efd22"><li id="dds_faq_0001__l9b7de5a533d64bda9939d75ba3dcff91">Whether the vCPUs, IOPS, and storage space for DDS DB instances are sufficient. If any of them is insufficient, optimize or upgrade the related configuration.</li><li id="dds_faq_0001__l9830311b45d7403b8fb3ddfcc6675165">Whether the performance of DDS DB instances is satisfying, whether a large number of slow query statements exist, whether query statements need to be optimized, and whether any index is redundant or missing.</li></ol>
|
|
</li></ol>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_faq_0101.html">Common FAQs</a></div>
|
|
</div>
|
|
</div>
|
|
|