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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>[SERVER-9305] Enabling adding expireAfterSeconds to convert to a TTL index</title>
                <link>https://jira.mongodb.org/browse/SERVER-9305</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The challenge with this is in the way system.indexes is implemented. It is not possible to easily grow the index spec document.&lt;/p&gt;

&lt;p&gt;This would allow you to take any existing index and have it work as a TTL index.&lt;/p&gt;

&lt;p&gt;Should test this also works with _id indexes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="71264">SERVER-9305</key>
            <summary>Enabling adding expireAfterSeconds to convert to a TTL index</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>ttl</label>
                    </labels>
                <created>Tue, 9 Apr 2013 19:52:25 +0000</created>
                <updated>Tue, 6 Dec 2022 05:22:12 +0000</updated>
                            <resolved>Tue, 1 Feb 2022 16:49:28 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>10</votes>
                                    <watches>21</watches>
                                                                                                                <comments>
                            <comment id="4327977" author="louis.williams" created="Tue, 1 Feb 2022 16:49:28 +0000"  >&lt;p&gt;Indexes can now be converted to TTL as of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13938&quot; title=&quot;Allow TTLMonitor to use existing indexes starting with Date field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13938&quot;&gt;&lt;del&gt;SERVER-13938&lt;/del&gt;&lt;/a&gt; in MongoDB 5.1. This is documented &lt;a href=&quot;https://docs.mongodb.com/v5.2/core/index-ttl/#convert-a-non-ttl-single-field-index-into-a-ttl-index&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We will not support this on _id indexes.&lt;/p&gt;</comment>
                            <comment id="928316" author="leonn" created="Sun, 31 May 2015 22:01:22 +0000"  >&lt;p&gt;Add TTL on _id would be the best. If you need to have very fast writes in a scenario with a big load of data.&lt;/p&gt;</comment>
                            <comment id="738361" author="kevin.pulo@10gen.com" created="Fri, 10 Oct 2014 04:26:49 +0000"  >&lt;p&gt;A possible workaround is to create another index in the reverse order, with TTL, and then once that&apos;s built drop the original index.  The downside is you need enough space and time to build the index again.&lt;/p&gt;

&lt;p&gt;ie. instead of trying to &quot;convert&quot; {a:1} to TTL, do 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;   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.ensureIndex({a:-1}, {expireAfterSeconds: x})&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;db.foo.dropIndex({a: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;If you feel like being clean you could then do&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;db.foo.ensureIndex({a:1}, {expireAfterSeconds: x})&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;db.foo.dropIndex({a:-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;to get back to having the &quot;right&quot; index, even though the reverse one should work just as well.&lt;/p&gt;</comment>
                            <comment id="443612" author="ryanwitt" created="Mon, 21 Oct 2013 00:50:40 +0000"  >&lt;p&gt;+1&lt;/p&gt;</comment>
                            <comment id="353248" author="eliot" created="Wed, 5 Jun 2013 03:50:33 +0000"  >&lt;p&gt;Its not trivial to add to collmod&lt;/p&gt;</comment>
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