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    <title>MongoDB Jira</title>
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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-6520] Ironically Compaction makes our collection 10GB bigger !</title>
                <link>https://jira.mongodb.org/browse/SERVER-6520</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This was crazy and made me even think what&apos;s the meaning of &quot;Compaction&quot; for mongodb ? &lt;/p&gt;

&lt;p&gt;&amp;gt; show dbs&lt;br/&gt;
db0     35.9365234375GB&lt;br/&gt;
local   10.1982421875GB&lt;br/&gt;
test    (empty)&lt;br/&gt;
&amp;gt; use db0&lt;br/&gt;
switched to db db0&lt;br/&gt;
&amp;gt; db.entries.count()&lt;br/&gt;
51927379&lt;br/&gt;
&amp;gt; db.entries.runCommand( &quot;compact&quot; )&lt;/p&gt;
{ &quot;ok&quot; : 1 }
&lt;p&gt;&amp;gt; show dbs&lt;br/&gt;
db0     45.931640625GB&lt;br/&gt;
local   10.1982421875GB&lt;br/&gt;
test    (empty)&lt;/p&gt;</description>
                <environment>ubuntu 10.04 mongodb 2.0.3</environment>
        <key id="44832">SERVER-6520</key>
            <summary>Ironically Compaction makes our collection 10GB bigger !</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="stonegao">Stone, Gao</reporter>
                        <labels>
                            <label>storage</label>
                    </labels>
                <created>Thu, 19 Jul 2012 15:44:45 +0000</created>
                <updated>Wed, 15 Aug 2012 14:24:12 +0000</updated>
                            <resolved>Thu, 19 Jul 2012 16:11:32 +0000</resolved>
                                    <version>2.0.3</version>
                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="144930" author="stonegao" created="Thu, 19 Jul 2012 16:35:33 +0000"  >&lt;p&gt;Got it. Thanks for your quick response!&lt;/p&gt;</comment>
                            <comment id="144913" author="milkie" created="Thu, 19 Jul 2012 16:11:32 +0000"  >&lt;p&gt;The docs at &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Excessive+Disk+Space#ExcessiveDiskSpace-RecoveringDeletedSpace&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Excessive+Disk+Space#ExcessiveDiskSpace-RecoveringDeletedSpace&lt;/a&gt;&lt;br/&gt;
explain why this occurs.  The compact command only defragments and compacts data records within the data files.  It doesn&apos;t shrink the data files, and in fact it can grow them as it needs work space to do the defragmentation.&lt;br/&gt;
The current way to reduce the size of the data files is to use repair, which copies all the records to new temporary data files and then swaps them with the current data files.&lt;/p&gt;</comment>
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