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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-12775] explain() performance degraded when all potential plans added to results</title>
                <link>https://jira.mongodb.org/browse/SERVER-12775</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a workload where explain() is called a lot I&apos;ve lately seen a certain regression in throughput.&lt;br/&gt;
I was able to isolate the commit that caused the problem.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6dd40e54de4d62ed1c649f6f620a574e6de74fa8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6dd40e54de4d62ed1c649f6f620a574e6de74fa8&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The throughput looks like 20% less and I&apos;m completely able to recover if I revert to the previous revision. See screenshot attached.&lt;/p&gt;</description>
                <environment></environment>
        <key id="111752">SERVER-12775</key>
            <summary>explain() performance degraded when all potential plans added to results</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="4">Incomplete</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>26qa</label>
                            <label>Performance</label>
                    </labels>
                <created>Wed, 19 Feb 2014 05:18:53 +0000</created>
                <updated>Thu, 29 Jan 2015 19:49:26 +0000</updated>
                            <resolved>Thu, 29 Jan 2015 19:49:22 +0000</resolved>
                                    <version>2.5.5</version>
                                                    <component>Concurrency</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="816818" author="david.storch" created="Thu, 29 Jan 2015 19:49:14 +0000"  >&lt;p&gt;This refers to performance of explain in 2.6.x. Closing as incomplete for two reasons:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;explain doesn&apos;t have strict performance requirements like regular reads and writes do, and&lt;/li&gt;
	&lt;li&gt;explain has been rewritten for 3.0.x under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10448&quot; title=&quot;Revamp explain() formatting&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10448&quot;&gt;&lt;del&gt;SERVER-10448&lt;/del&gt;&lt;/a&gt;, so this ticket refers to old code.&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="501717" author="dan@10gen.com" created="Wed, 19 Feb 2014 19:06:15 +0000"  >&lt;p&gt;I don&apos;t think explain performance is something we&apos;re worried about, but the offending commit causes us to do more work in explain, so it&apos;s not unexpected.&lt;/p&gt;</comment>
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