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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1136] Online defragCollection command</title>
                <link>https://jira.mongodb.org/browse/SERVER-1136</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This would be useful to compact a collection after removing large fields.&lt;/p&gt;

&lt;p&gt;I think the best procedure would be to clone the collection, then replay the oplog onto the new collection, and finally do an atomic collection rename to replace the original.&lt;/p&gt;</description>
                <environment></environment>
        <key id="11988">SERVER-1136</key>
            <summary>Online defragCollection command</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Wed, 19 May 2010 14:40:33 +0000</created>
                <updated>Tue, 6 Dec 2022 05:49:26 +0000</updated>
                            <resolved>Fri, 1 Jun 2018 14:08:54 +0000</resolved>
                                                                    <component>Performance</component>
                                        <votes>38</votes>
                                    <watches>28</watches>
                                                                                                                <comments>
                            <comment id="1907953" author="ian@10gen.com" created="Fri, 1 Jun 2018 14:08:54 +0000"  >&lt;p&gt;This was implemented in 1.9.0 as tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2120&quot; title=&quot;Inplace compaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2120&quot;&gt;&lt;del&gt;SERVER-2120&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="14342" author="nicolas_" created="Thu, 20 May 2010 05:06:29 +0000"  >&lt;p&gt;We&apos;re going to remove fields that take half the size of each document. And later probably other fields, for a total reduction of 80%. So.. we would love this feature.&lt;/p&gt;

&lt;p&gt;Right now, to compact data, we know these solutions:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;copying the collection (even within the same database), works for us as we have a lot of &quot;little&quot; collections.&lt;/li&gt;
	&lt;li&gt;repairing the database =&amp;gt; offline&lt;/li&gt;
	&lt;li&gt;cloning the database, and use this clone as a new master ? =&amp;gt; offline only during the switch&lt;/li&gt;
&lt;/ul&gt;
</comment>
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