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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-63885] Flush new optimizer&apos;s plan cache when relevant query knob values change</title>
                <link>https://jira.mongodb.org/browse/SERVER-63885</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62797&quot; title=&quot;Invalidate SBE plan cache when any of the query knobs is changed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62797&quot;&gt;&lt;del&gt;SERVER-62797&lt;/del&gt;&lt;/a&gt; as part of the SBE plan cache project, we are changing the server to flush the SBE plan cache when certain query-related setParameters are updated. This ticket is related to a follow-on project to the SBE plan cache. We will extend the SBE plan cache in order to cache plans produced by the new optimizer.&lt;/p&gt;

&lt;p&gt;This means that we should also flush the new optimizer&apos;s plan cache when the value of a parameter which affects the behavior of the new optimizer is updated. This can be implemented by adding an &lt;tt&gt;on_update&lt;/tt&gt; hook to the IDL definition of a server parameter which ends up calling &lt;tt&gt;clear()&lt;/tt&gt; on the plan cache. Once we have implemented a plan cache which works with the new optimizer, we should consider introducing &lt;tt&gt;on_update&lt;/tt&gt; hooks for the &lt;tt&gt;internalCascadesOptimizer*&lt;/tt&gt; parameters &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c65aa01ff0a99d6bcbe44a4fef44a33e918d939d/src/mongo/db/query/query_knobs.idl#L668-L722&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. There may also be new Cascades-related knobs which were added after this writing, so it&apos;s worth doing a fresh audit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1988160">SERVER-63885</key>
            <summary>Flush new optimizer&apos;s plan cache when relevant query knob values change</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Feb 2022 21:38:04 +0000</created>
                <updated>Tue, 30 Jan 2024 16:09:11 +0000</updated>
                            <resolved>Tue, 30 Jan 2024 16:09:11 +0000</resolved>
                                                                    <component>Query Planning</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
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