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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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            <title>[SERVER-3588] Be smarter about opening databases</title>
                <link>https://jira.mongodb.org/browse/SERVER-3588</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Copied from &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/a1b73e36b6be0b92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/a1b73e36b6be0b92&lt;/a&gt; :&lt;/p&gt;

&lt;p&gt;When number of database grow large, mongod will spent very long time to start. &lt;br/&gt;
I have about 23500 databases in dbpath, and starting mongod will spent about 45 mins. &lt;br/&gt;
I read the source code of mongod and used strace to watch what mongod do while starting. I found that mongod open all databases to check the pdfile version while starting. When mongod open a database, it call &quot;getDatabaseNames&quot;, and &quot;getDatabaseNames&quot; will call file stat for about N (N is the number of databases) times. So mongod will call stat about N * N times while checking the pdfile version of all databases. This will spent too long time. &lt;/p&gt;</description>
                <environment></environment>
        <key id="20931">SERVER-3588</key>
            <summary>Be smarter about opening databases</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Aug 2011 18:55:01 +0000</created>
                <updated>Tue, 6 Dec 2022 05:41:31 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 20:20:35 +0000</resolved>
                                    <version>1.6.5</version>
                    <version>1.8.2</version>
                                                    <component>MMAPv1</component>
                    <component>Storage</component>
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