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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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<item>
            <title>[SERVER-4188] Limit on number of Databases? Design approach to partition by database a good idea?</title>
                <link>https://jira.mongodb.org/browse/SERVER-4188</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I have an application that is virtually partitioned on a relational database (MySQL) and we are moving to Mongo. We have 20,000 accounts (with an accountid) partition field. I have a question surrounding our design approach with moving to Mongo.&lt;/p&gt;

&lt;p&gt;We currently hoped to give each account it&apos;s own database and then have a central account manager db to control routing. This appears to be working really well and performance is awesome.&lt;/p&gt;

&lt;p&gt;We could not find any limit anywhere on DB numbers per installation. There was a reference to the file access limits (which we increased to 65536 on our ubuntu installation)&lt;/p&gt;

&lt;p&gt;Should we collapse all accounts into a single DB, using an account key field, apply combined indexes etc and then rely on auto-sharding? Or is it ok to continue to create new databases per account to reduce the index overheads for large accounts?&lt;/p&gt;

&lt;p&gt;Your help is much appreciated &lt;/p&gt;

</description>
                <environment>Ubuntu (latest)</environment>
        <key id="24373">SERVER-4188</key>
            <summary>Limit on number of Databases? Design approach to partition by database a good idea?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="ray.smith">Ray Smith</reporter>
                        <labels>
                            <label>databasedesign</label>
                    </labels>
                <created>Wed, 2 Nov 2011 09:38:21 +0000</created>
                <updated>Wed, 29 Feb 2012 03:54:03 +0000</updated>
                            <resolved>Wed, 2 Nov 2011 12:20:44 +0000</resolved>
                                    <version>2.0.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="64172" author="scotthernandez" created="Wed, 2 Nov 2011 12:20:33 +0000"  >&lt;p&gt;Sharding is really best done at the collection level, not by creating many databases. You are probably better off using a single collection with the account fields as the shard-key if you want to use Sharding in MongoDB. There is nothing wrong with what you have done except you have to maintain it and create your own partitioning.&lt;/p&gt;

&lt;p&gt;It is better to ask these types of questions here (&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;). In fact, you will find people have already asked and answered these types of questions.&lt;/p&gt;</comment>
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