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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-773] include question about preallocation in storage FAQ</title>
                <link>https://jira.mongodb.org/browse/DOCS-773</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;hello, I use MongoDB 2.2.1 and it uses a lot of disk space. about 5-6 times more than it was on mssql. and you can explain it?&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Reporter&lt;/b&gt;: Bezhan Pkhovelishvili&lt;br/&gt;
&lt;b&gt;E-mail&lt;/b&gt;: &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;mailto:bejo@singular.ge&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;bejo@singular.ge&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/mail_small.gif&quot; height=&quot;12&quot; width=&quot;13&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment>Windows Server 2008, MongoDB 2.2.1&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/sql-comparison/&quot;&gt;http://docs.mongodb.org/manual/reference/sql-comparison/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11&lt;br/&gt;
*Referrer*: &lt;a href=&quot;http://www.mongodb.org/display/DOCS/SQL+to+Mongo+Mapping+Chart&quot;&gt;http://www.mongodb.org/display/DOCS/SQL+to+Mongo+Mapping+Chart&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1920 x 1080&lt;br/&gt;
</environment>
        <key id="56889">DOCS-773</key>
            <summary>include question about preallocation in storage FAQ</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="-1">Unassigned</assignee>
                                    <reporter username="auto">auto</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                            <label>newwriter</label>
                    </labels>
                <created>Mon, 19 Nov 2012 12:50:34 +0000</created>
                <updated>Mon, 30 Oct 2023 22:41:04 +0000</updated>
                            <resolved>Tue, 23 Sep 2014 17:28:33 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="193757" author="auto" created="Mon, 19 Nov 2012 15:05:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-11-19T14:42:17Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-773&quot; title=&quot;include question about preallocation in storage FAQ&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-773&quot;&gt;&lt;del&gt;DOCS-773&lt;/del&gt;&lt;/a&gt;: including link from SQL charts to FAQ&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/028ed1733241bdbb3eeae064fc18a1f699a0fe41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/028ed1733241bdbb3eeae064fc18a1f699a0fe41&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="193732" author="samk" created="Mon, 19 Nov 2012 14:39:26 +0000"  >&lt;p&gt;There are a lot of reasons that might explain this kind of behavior, but the most significant explanation is that MongoDB per-allocates disk space for databases upon creation to facilitate responsive write performance. See the output of the database statistics &amp;lt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/database-statistics/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/database-statistics/&lt;/a&gt;&amp;gt;, for a start. &lt;/p&gt;

&lt;p&gt;Beyond this, you might find better luck addressing the question to the MongoDB user group &amp;lt;&lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user&lt;/a&gt;&amp;gt;, and providing more information about your usage pattern: &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the amount of data,&lt;/li&gt;
	&lt;li&gt;your data model, including document structure collection and database organization, and&lt;/li&gt;
	&lt;li&gt;your document update pattern, (e.g. do you update documents after inserting them, and how?)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I hope this helps. &lt;/p&gt;

&lt;p&gt;To help resolve this issue in the future, I will include a link to the FAQ in the SQL mapping chart, and add some notes to the storage FAQ about disk use and preallocation. &amp;lt;&lt;a href=&quot;http://docs.mongodb.org/manual/faq/storage/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/storage/&lt;/a&gt;&amp;gt;&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
sam&lt;/p&gt;</comment>
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