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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-34670] TTL Deletes the record, but doesn&apos;t clear the indexs for the collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-34670</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a collection with 200 milliion document which has an TTL index for 1 year.&lt;br/&gt;
The data in the collection is inserted daily around 5 gb a day. The past years data is getting deleted when the TTL deletes run.&lt;/p&gt;

&lt;p&gt;But the index size on the collection is not getting reduce after TTL index deletion.&lt;/p&gt;</description>
                <environment></environment>
        <key id="533962">SERVER-34670</key>
            <summary>TTL Deletes the record, but doesn&apos;t clear the indexs for the collection</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="cyberwalk3r">Cyberwalker</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Apr 2018 15:31:57 +0000</created>
                <updated>Fri, 8 Jun 2018 03:39:18 +0000</updated>
                            <resolved>Mon, 14 May 2018 18:18:58 +0000</resolved>
                                    <version>3.4.13</version>
                    <version>3.4.14</version>
                                                    <component>TTL</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1890809" author="thomas.schubert" created="Mon, 14 May 2018 18:18:43 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cyberwalk3r&quot; class=&quot;user-hover&quot; rel=&quot;cyberwalk3r&quot;&gt;cyberwalk3r&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report. I suspect what you&apos;re seeing is the result of the WiredTiger not freeing the disk space to operating system. You may confirm that the keys were deleted by running the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/validate/index.html#validate&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;validate&lt;/a&gt; command. If you would like to return space to the OS, I would recommend either resyncing or running compact.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
 Kelsey&lt;/p&gt;</comment>
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	&lt;li&gt;Disable TTL monitor so it doesn&apos;t delete the records.&lt;/li&gt;
	&lt;li&gt;Create a sample collection  with TTL index.&lt;/li&gt;
	&lt;li&gt;import data&lt;/li&gt;
	&lt;li&gt;Get the collection size stats.&lt;/li&gt;
	&lt;li&gt;Enable TTL monitor&lt;/li&gt;
	&lt;li&gt;After TTL deletes are finished, get the collection stats.&lt;/li&gt;
	&lt;li&gt;The collection storage size is reduced, but the index size stays the same.&lt;/li&gt;
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