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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>[SERVER-31155] High memory &amp; resources usage + very long boot time with many DBs</title>
                <link>https://jira.mongodb.org/browse/SERVER-31155</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using a lot of DBs (few thousands) mongod process take a lot of time to boot (minutes) and takes a lot of system resources afterwards.&lt;br/&gt;
Until boot is complete (minutes) the DB doesn&apos;t accept client connections.&lt;/p&gt;

&lt;p&gt;It open all storage files (one per every collection and per index in every DB) + consumes a lot of memory. For 2000 DBs with 10 collections and 5 indexes per collection, there will be 100000 open file handlers.&lt;/p&gt;

&lt;p&gt;On our use-case, we keep the DBs but access them rarely, usually only few DBs are relevant at any given moment.&lt;/p&gt;

&lt;p&gt;I would expect mongo to lazy load the DBs when first connection is made.&lt;br/&gt;
(and hopefully unload if no active connection for a while)&lt;/p&gt;

&lt;p&gt;Assaf&lt;/p&gt;</description>
                <environment>Ubuntu 16.04</environment>
        <key id="429287">SERVER-31155</key>
            <summary>High memory &amp; resources usage + very long boot time with many DBs</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="3">Duplicate</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="assaf-oren">assaf-oren</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Sep 2017 15:51:33 +0000</created>
                <updated>Tue, 17 Oct 2017 20:33:43 +0000</updated>
                            <resolved>Wed, 20 Sep 2017 21:51:20 +0000</resolved>
                                    <version>3.4.6</version>
                                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1701904" author="thomas.schubert" created="Tue, 17 Oct 2017 20:33:43 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=assaf-oren&quot; class=&quot;user-hover&quot; rel=&quot;assaf-oren&quot;&gt;assaf-oren&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Sorry for the slow reply. Yes, it will close indexes or collections that have not been accessed recently.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1678425" author="assaf-oren" created="Thu, 21 Sep 2017 06:46:01 +0000"  >&lt;p&gt;Thanks, &lt;br/&gt;
This configuration won&apos;t solve the very long boot time, but will save resources.&lt;br/&gt;
I&apos;ll try it.&lt;/p&gt;

&lt;p&gt;Will it release all related resources for the collection, DB and indexes?&lt;/p&gt;</comment>
                            <comment id="1678185" author="thomas.schubert" created="Wed, 20 Sep 2017 21:51:06 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=assaf-oren&quot; class=&quot;user-hover&quot; rel=&quot;assaf-oren&quot;&gt;assaf-oren&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report. This appears to be a duplicate of the improvement request tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25025&quot; title=&quot;Improve startup time when there are tens of thousands of collections/indexes on WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25025&quot;&gt;&lt;del&gt;SERVER-25025&lt;/del&gt;&lt;/a&gt;. Please feel free to vote for it and watch it for updates.&lt;/p&gt;

&lt;p&gt;By default, MongoDB will close inactive WiredTiger tables after 25 hours, however this can be tuned. From your description, you may see benefit using the following config, which reduces the idle time to 30 seconds: &lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;storage:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    engine: wiredTiger&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    wiredTiger:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        engineConfig:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            configString: &quot;file_manager=(close_handle_minimum=100,close_idle_time=30,close_scan_interval=30)&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="300619">SERVER-25025</issuekey>
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