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        <build-date>13-04-2023</build-date>
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            <title>[DOCS-414] FAQ: With the advent of 2.2 and db-level locking, what are the implications of having one collection per database?</title>
                <link>https://jira.mongodb.org/browse/DOCS-414</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Separating write-heavy collections into distinct databases will take advantage of DB-level locking, and that it will cost you some disk space due to preallocation.&lt;/p&gt;

&lt;p&gt;Potential downsides to putting every collection in its own database:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The listDatabases command, used by MMS and other tools, will become slow if you have hundreds or thousands of databases.&lt;/li&gt;
	&lt;li&gt;MMS&apos;s DB stats collection will put additional load on your system if you have many databases; MMS will collect stats less frequently in that case. It will refuse to collect stats on more than 100 databases.&lt;/li&gt;
	&lt;li&gt;Preallocation, although it&apos;s done in the background, is still an operation that competes with others for resources; the more databases you insert into the more common preallocations will be.&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;In conclusion, probably better to keep the number of databases in the dozens, not hundreds, and separate collections into databases judiciously.&lt;/p&gt;</description>
                <environment></environment>
        <key id="47452">DOCS-414</key>
            <summary>FAQ: With the advent of 2.2 and db-level locking, what are the implications of having one collection per database?</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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>
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                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="barrie">Barrie Segal</reporter>
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                <created>Fri, 17 Aug 2012 15:19:04 +0000</created>
                <updated>Mon, 30 Oct 2023 22:35:42 +0000</updated>
                            <resolved>Sat, 7 Feb 2015 01:30:07 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
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            <issuekey id="52525">DOCS-582</issuekey>
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