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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>
15 lines
1.5 KiB
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15 lines
1.5 KiB
HTML
<a name="dds_faq_0006"></a><a name="dds_faq_0006"></a>
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<h1 class="topictitle1">What Is the Time Delay for Primary/Secondary Synchronization in a Replica Set?</h1>
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<div id="body1482377670190"><p id="dds_faq_0006__a3a3c0b9a3e9c4b258fea28eef1a535aa">The delay for primary/secondary synchronization cannot be calculated using a formula. The delay is affected by the following factors:</p>
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<ol id="dds_faq_0006__o6e158cc8138a42a2bbd5829642467539"><li id="dds_faq_0006__lbb4946ee8d1a4a6387c82c9fb4bff6f0">Network communication status</li><li id="dds_faq_0006__l077c7a6f59fa47caac5d1d4fa75b4b06">Transaction pressure on the primary node, that is, transactions per second (TPS) of the primary node</li><li id="dds_faq_0006__l703ce21581ce462eabb0195268f817c5">Transaction size executed by the primary node, that is, the duration of a transaction execution</li><li id="dds_faq_0006__lc6f07a64d02e4aa4bcb3f756f1b03172">Load of the secondary node</li></ol>
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<p id="dds_faq_0006__p2064477917411">If the primary node bears heavy pressure within a period and executes a large number of transactions per second, the synchronization to the secondary node is delayed.</p>
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<p id="dds_faq_0006__p5552904711533">You can view <strong id="dds_faq_0006__b842352706173519">Replication Lag</strong> of the secondary node on the Cloud Eye console to know the synchronization delay.</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="dds_faq_0102.html">Database Performance</a></div>
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</div>
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</div>
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