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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-12534] [Server] createIndex -- a single index may be both Partial and TTL</title>
                <link>https://jira.mongodb.org/browse/DOCS-12534</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;It appears that &#8211; at least on 4.0.5 &#8211; indexes &lt;b&gt;can&lt;/b&gt; be both &lt;tt&gt;Partial&lt;/tt&gt;&#160;and &lt;tt&gt;TTL&lt;/tt&gt;.&#160;&lt;/p&gt;

&lt;p&gt;The documentation seems rather silent on this point.&#160; Perhaps it is not &lt;em&gt;meant&lt;/em&gt; to work?&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Example&quot;&gt;&lt;/a&gt;Example&lt;/h3&gt;

&lt;p&gt;The documentation is not entirely clear on the subject of creating indexes that are *&lt;em&gt;both&lt;/em&gt; &quot;partial&quot; and &quot;TTL&quot;, so I have tested this myself in a version 4.0.5 &lt;tt&gt;mongod&lt;/tt&gt;. I found that I could indeed create an index that combined the attributes of &quot;TTL Index&quot; and &quot;Partial Index&quot;, and that it did indeed expire only documents matching the &lt;tt&gt;partialFilterExpression&lt;/tt&gt; defined on the index.&lt;/p&gt;

&lt;p&gt;As an example, on the collection &lt;tt&gt;test.foo&lt;/tt&gt;, I created an index:&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.foo.createIndex({F:1}, {partialFilterExpression: {D: 1}, expireAfterSeconds: 10})&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;{{}}&lt;/p&gt;

&lt;p&gt;and then inserted two documents into the collection:&lt;br/&gt;
 {{}}&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;   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;{ &quot;_id&quot; : ObjectId(&quot;5c8188656c5c4825af60c90e&quot;), &quot;F&quot; : ISODate(&quot;2019-03-07T20:59:18.428Z&quot;), &quot;D&quot; : 3 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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; { &quot;_id&quot; : ObjectId(&quot;5c81886c6c5c4825af60c90f&quot;), &quot;F&quot; : ISODate(&quot;2019-03-07T20:59:18.428Z&quot;), &quot;D&quot; : 1 }&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;{{}}&lt;/p&gt;

&lt;p&gt;Here, the index will expire documents when the &lt;tt&gt;F&lt;/tt&gt; field contains a &lt;tt&gt;Date&lt;/tt&gt; more than 10 seconds old, but we intend it to expire &lt;b&gt;only&lt;/b&gt; those documents where &lt;tt&gt;D = 1&lt;/tt&gt; &#8211; the document with &lt;tt&gt;D = 3&lt;/tt&gt; should be left untouched.&lt;/p&gt;

&lt;p&gt;Waiting for about a minute for the index to activate, this is the data left in the collection:&lt;br/&gt;
 {{}}&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;{ &quot;_id&quot; : ObjectId(&quot;5c8188656c5c4825af60c90e&quot;), &quot;F&quot; : ISODate(&quot;2019-03-07T20:59:18.428Z&quot;), &quot;D&quot; : 3 }&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;{{}}&lt;/p&gt;

&lt;p&gt;The index has expired the data we wanted expired, and only that data&lt;/p&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;ToDo: Explore application of partial property on other index properties or types&lt;/li&gt;
	&lt;li&gt;Update documentation for partial indexes to explicitly state it&apos;s applicability to constraining other index properties or types.&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;%C2%A0&quot;&gt;&lt;/a&gt;&#160;&lt;/h2&gt;</description>
                <environment></environment>
        <key id="714084">DOCS-12534</key>
            <summary>[Server] createIndex -- a single index may be both Partial and TTL</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="ian.fogelman@mongodb.com">Ian Fogelman</assignee>
                                    <reporter username="mark.brinsmead@mongodb.com">Mark Brinsmead</reporter>
                        <labels>
                            <label>proactive</label>
                            <label>server-docs-bug-bash</label>
                    </labels>
                <created>Fri, 8 Mar 2019 21:44:40 +0000</created>
                <updated>Mon, 13 Nov 2023 17:29:17 +0000</updated>
                            <resolved>Fri, 10 Nov 2023 14:06:55 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>4</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3918956" author="andre.spiegel@10gen.com" created="Tue, 6 Jul 2021 19:44:51 +0000"  >&lt;p&gt;Let me add that I only learned about this possibility today, when discussing possible enhancements to TTL indexes to allow more complex conditions. So this definitely needs to be validated (whether it&apos;s really supposed to work), and clearly documented in the sections on both TTL indexes and partial indexes.&lt;/p&gt;</comment>
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