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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>
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<item>
            <title>[DOCS-12387] Docs for SERVER-33303: Modifying indexes impacts application of index filters</title>
                <link>https://jira.mongodb.org/browse/DOCS-12387</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description:&lt;/h3&gt;

&lt;p&gt;This introduces the &quot;planCacheKey&quot; field to explain/logger/debug output.&lt;/p&gt;

&lt;p&gt;To summarize the difference between planCacheKey and queryHash:&lt;/p&gt;

&lt;p&gt;queryHash is &quot;stable&quot; across catalog changes. That is, the &quot;query shape&quot; (and thus, the hash of theh query shape) is derived from the query the user wrote down, and does not depend on any state inside the server. It will not change if you add/drop/change indexes.&lt;/p&gt;

&lt;p&gt;planCacheKey is &quot;unstable&quot; across catalog changes. It depends both on the query shape and which indexes are available.&lt;/p&gt;

&lt;p&gt;This is slightly confusing even for us so if you have questions definitely slack/email me!(ian.boros/ianb)&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;According to the &lt;a href=&quot;https://docs.mongodb.com/manual/core/query-plans/#index-filters&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation&lt;/a&gt;:&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Index filters exist for the duration of the server process and do not persist after shutdown. MongoDB also provides a command to manually remove filters.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;While a given index filter does persist across index creation and drops, its application towards queries &lt;b&gt;does&lt;/b&gt; seem to be influenced by such actions.&lt;/p&gt;&lt;/blockquote&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;
&lt;ul&gt;
	&lt;li&gt;source/reference/explain-results &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;profiler &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;log messages &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;4.2 &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;possibly regarding:
	&lt;ul&gt;
		&lt;li&gt;&lt;del&gt;plan cache filter&lt;/del&gt;&lt;/li&gt;
		&lt;li&gt;analyzing mongodb perf &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
		&lt;li&gt;core/query-plans &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
		&lt;li&gt;&lt;del&gt;core/query-optimization&lt;/del&gt;&lt;/li&gt;
		&lt;li&gt;tutorial/evaluate-operation-performance &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
		&lt;li&gt;&lt;del&gt;tutorial/manage-indexes&lt;/del&gt;&lt;/li&gt;
		&lt;li&gt;&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="676738">DOCS-12387</key>
            <summary>Docs for SERVER-33303: Modifying indexes impacts application of index filters</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                            <label>QFB</label>
                            <label>storch</label>
                    </labels>
                <created>Wed, 23 Jan 2019 16:04:06 +0000</created>
                <updated>Mon, 13 Nov 2023 18:26:37 +0000</updated>
                            <resolved>Thu, 31 Jan 2019 00:19:17 +0000</resolved>
                                                    <fixVersion>4.1.5</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2132836" author="xgen-internal-githook" created="Thu, 31 Jan 2019 00:17:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@mongodb.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11962&quot; title=&quot;Docs for SERVER-35981: Include hash of plan cache key in planCacheListShapes and planCacheListPlans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11962&quot;&gt;&lt;del&gt;DOCS-11962&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12387&quot; title=&quot;Docs for SERVER-33303: Modifying indexes impacts application of index filters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12387&quot;&gt;&lt;del&gt;DOCS-12387&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11959&quot; title=&quot;Docs for SERVER-36527: Include queryHash in explain output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11959&quot;&gt;&lt;del&gt;DOCS-11959&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11965&quot; title=&quot;Docs for SERVER-23332: Expose query plan cache key in system.profile entry and query log lines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11965&quot;&gt;&lt;del&gt;DOCS-11965&lt;/del&gt;&lt;/a&gt;: queryHash and planCacheKey&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0e367a666aac090a7ed617e20309a1b1760911b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0e367a666aac090a7ed617e20309a1b1760911b7&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="497452">SERVER-33303</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                                        </inwardlinks>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="587606">DOCS-11959</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="587610">DOCS-11962</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="587613">DOCS-11965</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="592875">DOCS-11982</issuekey>
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