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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-8599] Prevent bad query plans from being cached by adding additional safeguards</title>
                <link>https://jira.mongodb.org/browse/SERVER-8599</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The query optimizer has always had a feature where if we use a cached plan for a query and we reach an nscanned that is 10x the nscanned that was recorded when the query plan was saved in the cache, then we attempt using other query plans as well. But this check is only triggered if a high nscanned is observed before 101 matches are found. After 101 matches are found, we&apos;re stuck using the cached plan only.&lt;/p&gt;

&lt;p&gt;We should add additional checks (eg, deviation from avg run time or total nscanned) to guard against keeping bad plans.&lt;/p&gt;</description>
                <environment></environment>
        <key id="65532">SERVER-8599</key>
            <summary>Prevent bad query plans from being cached by adding additional safeguards</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="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="3">Duplicate</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                            <label>query_triage</label>
                    </labels>
                <created>Sat, 16 Feb 2013 17:27:33 +0000</created>
                <updated>Sat, 24 Jan 2015 17:18:25 +0000</updated>
                            <resolved>Tue, 30 Dec 2014 17:24:30 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="785662" author="dan@10gen.com" created="Sun, 14 Dec 2014 20:27:21 +0000"  >&lt;p&gt;Seems like this was already added in 2.6.0, but I don&apos;t think it was logged in an easy to find ticket.  Looks like it was committed against this instead: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12328&quot; title=&quot;Query: index intersection causes regression when index key set has low cardinality&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12328&quot;&gt;&lt;del&gt;SERVER-12328&lt;/del&gt;&lt;/a&gt; with &lt;a href=&quot;https://github.com/mongodb/mongo/commit/f211f148068b7acff6a06f5ccaa31feab654fd0f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt;&lt;/p&gt;</comment>
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