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    <title>MongoDB Jira</title>
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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>[DOCS-2743] Running explain no longer causes the query planner cache to be dropped</title>
                <link>https://jira.mongodb.org/browse/DOCS-2743</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Up until 2.5.5, when a user ran explain on a query, it would have the side effect of dropping the query plan cache for that query &quot;shape.&quot;&lt;/p&gt;

&lt;p&gt;In 2.5.5+ this behavior no longer holds true and the full set of plans which are considered for the query are pulled from the queryPlanCache itself.&lt;/p&gt;

&lt;p&gt;The only direct user-triggered way of dropping the cached plan for a query is by using the QueryPlanCache manipulation methods directly.&lt;/p&gt;

&lt;p&gt;I&apos;m not sure if this is mentioned anywhere in our documentation or whether this should be documented specifically, but it is a known behavior pre 2.5.5 and this is a backwards breaking change for users who depended on this behavior.&lt;/p&gt;

&lt;p&gt;See: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7468&quot; title=&quot;Don&amp;#39;t invalidate query plans when explain is run&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7468&quot;&gt;&lt;del&gt;SERVER-7468&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="111575">DOCS-2743</key>
            <summary>Running explain no longer causes the query planner cache to be dropped</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="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Tue, 18 Feb 2014 20:09:18 +0000</created>
                <updated>Wed, 5 Mar 2014 22:50:15 +0000</updated>
                            <resolved>Wed, 5 Mar 2014 22:50:09 +0000</resolved>
                                                    <fixVersion>v1.3.2</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="510325" author="xgen-internal-githook" created="Wed, 5 Mar 2014 22:33:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2826&quot; title=&quot;2.6 rel notes cleanup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2826&quot;&gt;&lt;del&gt;DOCS-2826&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2743&quot; title=&quot;Running explain no longer causes the query planner cache to be dropped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2743&quot;&gt;&lt;del&gt;DOCS-2743&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2650&quot; title=&quot;document 2.6 shell helper upgradeCheck()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2650&quot;&gt;&lt;del&gt;DOCS-2650&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2465&quot; title=&quot;Comprehensive document about backward-breaking changes in v2.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2465&quot;&gt;&lt;del&gt;DOCS-2465&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2726&quot; title=&quot;dochub link for index validation not working&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2726&quot;&gt;&lt;del&gt;DOCS-2726&lt;/del&gt;&lt;/a&gt; backwards compatibility and release notes cleanup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/94f29def1eda4f0f24d247fa0b3172dabe43d813&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/94f29def1eda4f0f24d247fa0b3172dabe43d813&lt;/a&gt;&lt;/p&gt;</comment>
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