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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-43624] Query executing during background index build completion can lead to suboptimal cached plan</title>
                <link>https://jira.mongodb.org/browse/SERVER-43624</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32943&quot; title=&quot;Query during background index build can lead to suboptimal cached plan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32943&quot;&gt;&lt;del&gt;SERVER-32943&lt;/del&gt;&lt;/a&gt; improved the timing of flushing the plan cache when building an index in the background.  The &lt;a href=&quot;https://github.com/mongodb/mongo/commit/2f20acfd0d462e7f6c1c1c59bd562c883f1db55d#diff-49cd662f2d16c383f50df30514b2365bR94-R117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;associated test&lt;/a&gt; seems to indicate that the change addresses the case where the concurrent query finishes prior to the completion of the index build. &lt;/p&gt;

&lt;p&gt;There is another case that is presently not addressed.  This would be when the query that gets replanned starts while the index build is still in progress but finishes &lt;em&gt;after&lt;/em&gt; the index build completes.  This situation can result in a suboptimal plan in the cache as described in the previous ticket requiring a manual flush of the plan cache.  We should consider preventing those concurrent operations from caching or pursuing some other mitigation technique.  &lt;/p&gt;</description>
                <environment></environment>
        <key id="939757">SERVER-43624</key>
            <summary>Query executing during background index build completion can lead to suboptimal cached plan</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="christopher.harris@mongodb.com">Chris Harris</reporter>
                        <labels>
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                <created>Wed, 25 Sep 2019 14:29:46 +0000</created>
                <updated>Tue, 6 Dec 2022 02:46:34 +0000</updated>
                                                                                                <votes>0</votes>
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