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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[SERVER-36528] Implement $planCacheStats aggregation metadata source</title>
                <link>https://jira.mongodb.org/browse/SERVER-36528</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="585520">SERVER-36528</key>
            <summary>Implement $planCacheStats aggregation metadata source</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="13201">Fixed</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 Aug 2018 15:47:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:09 +0000</updated>
                            <resolved>Tue, 21 Aug 2018 23:08:59 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1981960" author="xgen-internal-githook" created="Tue, 21 Aug 2018 23:02:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@10gen.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36528&quot; title=&quot;Implement $planCacheStats aggregation metadata source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36528&quot;&gt;&lt;del&gt;SERVER-36528&lt;/del&gt;&lt;/a&gt; Implement $planCacheStats agg source.&lt;/p&gt;

&lt;p&gt;The $planCacheStats agg metadata source should typically be used&lt;br/&gt;
instead of the older &apos;planCacheListPlans&apos; and&lt;br/&gt;
&apos;planCacheListQueryShapes&apos; commands (although these plan cache&lt;br/&gt;
commands are still fully supported).&lt;/p&gt;

&lt;p&gt;Lookup by &apos;queryHash&apos; can be achieved via a $planCacheStats-$match&lt;br/&gt;
pipeline.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21762f8b9b8c64fd32bed173eb74e2172088e21b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21762f8b9b8c64fd32bed173eb74e2172088e21b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1974764" author="david.storch" created="Mon, 13 Aug 2018 22:18:17 +0000"  >&lt;p&gt;Per discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.boros&quot; class=&quot;user-hover&quot; rel=&quot;ian.boros&quot;&gt;ian.boros&lt;/a&gt;, we plan to achieve this by:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Adding a {$planCacheStats: {}} aggregation metadata source, which opens a cursor that returns one document per plan cache entry.&lt;/li&gt;
	&lt;li&gt;Implementing a $match pushdown optimization, so that only matching plan cache entries need to be copied into DocumentSourcePlanCache. This should control the memory consumption for a $planCache cursor.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Users who wish to find plan cache entries with a particular query hash can run something like&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.myColl.aggregate([{$planCache: {}}, {$match: {queryHash: &quot;1234ABCD&quot;}}])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The initial draft of this work will be gated by the &lt;tt&gt;testCommandsEnabled&lt;/tt&gt; flag.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="592875">DOCS-11982</issuekey>
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            <issuekey id="592092">SERVER-36800</issuekey>
        </issuelink>
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