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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-29292] Track history of query plan changes in mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-29292</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We would like to have a data source for historical query plans and plan changes.&lt;/p&gt;

&lt;p&gt;Recording the time a new query shape appeared, or the time an existing shape acquired a new plan, would be very helpful in diagnosing sudden shifts in database behaviour (e.g., the ability to state unequivocally that a new query shape first appeared just before a performance disruption).&lt;/p&gt;

&lt;p&gt;recording new plans in the &lt;tt&gt;mongod&lt;/tt&gt; log may be adequate.  Maintaining an in-memory collection summarizing these and including other useful statistics like execution counts, average latency, average time waiting on locks, etc., would be even more useful.&lt;/p&gt;</description>
                <environment></environment>
        <key id="384926">SERVER-29292</key>
            <summary>Track history of query plan changes in mongod</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mark.brinsmead@mongodb.com">Mark Brinsmead</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 May 2017 00:04:05 +0000</created>
                <updated>Fri, 6 Jan 2023 20:39:41 +0000</updated>
                                                                            <component>Diagnostics</component>
                    <component>Querying</component>
                                        <votes>3</votes>
                                    <watches>21</watches>
                                                                                                                <comments>
                            <comment id="1651552" author="asya" created="Fri, 18 Aug 2017 16:19:09 +0000"  >&lt;p&gt;A request came up recently to add a timestamp into a plan that&apos;s cached (i.e. when it was cached) so it can be easier to confirm that the cache was cleared when it was supposed to be.  It seems like a small part of this ticket so I&apos;m adding a note here - I can file a new ticket if that&apos;s more appropriate.&lt;/p&gt;</comment>
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