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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-9574] Docs for SERVER-13220: Add and expose statistics to new query framework</title>
                <link>https://jira.mongodb.org/browse/DOCS-9574</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Engineering Ticket Description:&lt;/p&gt;

&lt;p&gt;The new query framework should expose statistics around planning and cache utilization.&lt;/p&gt;

&lt;p&gt;Question: expose globally or per collection?&lt;/p&gt;

&lt;p&gt;Statistics:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Number of times the cache is dropped (should we distinguish whether from write operations or index drop/raise?)&lt;/li&gt;
	&lt;li&gt;Number of times a plan is evicted from the cache
	&lt;ul&gt;
		&lt;li&gt;LRU evictions&lt;/li&gt;
		&lt;li&gt;Feedback evictions&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Cumulative time spent planning&lt;/li&gt;
	&lt;li&gt;Average number of plans considered per query shape&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Currently we drop plan cache entries and all associated statistics before allowing a new plan into the cache for the query shape. One way to achieve better execution stats over time for the query engine would be to maintain historical data in the plan cache.&lt;/p&gt;</description>
                <environment></environment>
        <key id="336365">DOCS-9574</key>
            <summary>Docs for SERVER-13220: Add and expose statistics to new query framework</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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
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                            <label>delete-docs-tickets</label>
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                <created>Mon, 5 Dec 2016 14:18:44 +0000</created>
                <updated>Fri, 27 Oct 2023 20:16:34 +0000</updated>
                            <resolved>Fri, 8 Dec 2017 20:31:02 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1747329" author="kay.kim@10gen.com" created="Fri, 8 Dec 2017 20:30:27 +0000"  >&lt;p&gt;Opened too soon.&lt;/p&gt;</comment>
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