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    <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-126] Add more details to the Lots of Collections wiki page</title>
                <link>https://jira.mongodb.org/browse/DOCS-126</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Considering the scale of data most people considering the &quot;Lots of Collections&quot; route have, I feel the page could use a lot more detailed information about the ramifications of choosing to use lots of collections.&lt;/p&gt;

&lt;p&gt;The following is what I added to my internal wiki:&lt;/p&gt;

&lt;p&gt;=== Namespaces ===&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;namespaces = collections + indexes and are per-database (stored in a db.ns file)&lt;/li&gt;
	&lt;li&gt;Check namespaces with &apos;&apos;db.system.namespaces.count()&apos;&apos; (safe &amp;amp; cheap)&lt;/li&gt;
	&lt;li&gt;&apos;&apos;show collections&apos;&apos; in the mongo shell will no longer work&lt;/li&gt;
	&lt;li&gt;~600 bytes per namespace on disk&lt;/li&gt;
	&lt;li&gt;namespaces are stored in a hashtable&lt;/li&gt;
	&lt;li&gt;so you should only fill the namespace table up to ~75%&lt;/li&gt;
	&lt;li&gt;namespace database is statically sized on server startup&lt;/li&gt;
	&lt;li&gt;change with --nssize&lt;/li&gt;
	&lt;li&gt;defaults to 16mb&lt;/li&gt;
	&lt;li&gt;can go up to 2047mb (docs say 2GB, but --nssize=2048 crashes)&lt;/li&gt;
	&lt;li&gt;db.ns file is created and zeroed to nssize //the first time data is inserted into the database//&lt;/li&gt;
	&lt;li&gt;So we&apos;d need to be careful creating test dbs on busy servers with high nssizes&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;== Limits ==&lt;/p&gt;

&lt;p&gt;Limits are approximate due to the fact hash tables should never be full.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Default: *&lt;b&gt;20k&lt;/b&gt;*&lt;/li&gt;
	&lt;li&gt;Maximum: *&lt;b&gt;2.5m&lt;/b&gt;*&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="11739">DOCS-126</key>
            <summary>Add more details to the Lots of Collections wiki page</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="schmichael">Michael Schurter</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Apr 2010 20:17:26 +0000</created>
                <updated>Tue, 18 Dec 2012 21:55:40 +0000</updated>
                            <resolved>Tue, 18 Dec 2012 21:55:40 +0000</resolved>
                                                                        <due></due>
                            <votes>2</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="93813" author="samk" created="Wed, 29 Feb 2012 17:18:03 +0000"  >&lt;p&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Using+a+Large+Number+of+Collections#comment-452199167&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Using+a+Large+Number+of+Collections#comment-452199167&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;It would be nice if the docs were updated to describe what the allowable syntax is for the nssize parameter. According to &lt;a href=&quot;http://www.mongodb.org/display&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display&lt;/a&gt;..., it&apos;s the file size in MB. Could one specify 1GB as &quot;1GB&quot; or would it have to be 1024?&lt;/p&gt;&lt;/blockquote&gt;</comment>
                    </comments>
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                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="54389">DOCS-661</issuekey>
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