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            <title>[SERVER-3467] Make the upper index limit in an $in query more explicit</title>
                <link>https://jira.mongodb.org/browse/SERVER-3467</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While hunting for what we though were missing documents in our collection, I discovered that $in queries have an upper limit of around 5,000 items. Does this sound about right?&lt;/p&gt;</description>
                <environment></environment>
        <key id="20029">SERVER-3467</key>
            <summary>Make the upper index limit in an $in query more explicit</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="kai5263499">Wes Widner</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Jul 2011 15:44:09 +0000</created>
                <updated>Fri, 30 Mar 2012 14:26:59 +0000</updated>
                            <resolved>Mon, 22 Aug 2011 15:43:52 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="44163" author="aaron" created="Sat, 23 Jul 2011 01:53:42 +0000"  >&lt;p&gt;It looks like your selectfromArr array has 12642 elements but only 5921 distinct elements.&lt;/p&gt;</comment>
                            <comment id="44090" author="kai5263499" created="Fri, 22 Jul 2011 18:11:47 +0000"  >&lt;p&gt;$in query with lots of elements&lt;/p&gt;</comment>
                            <comment id="44089" author="kai5263499" created="Fri, 22 Jul 2011 18:10:26 +0000"  >&lt;p&gt;I wrote an $in query which used an array with about 12,000 elements in it. I&apos;ll include the query as an attachment. When I run it, only ~5000 records are returned at a time which seems to indicate that there is an upper limit on how many elements an array can have in an $in query. &lt;/p&gt;</comment>
                            <comment id="44044" author="eliot" created="Fri, 22 Jul 2011 16:01:03 +0000"  >&lt;p&gt;No - that doesn&apos;t make sense...&lt;br/&gt;
How did you get to that conclusion?&lt;/p&gt;</comment>
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                            <attachment id="12404" name="hashhunt.js" size="543677" author="kai5263499" created="Fri, 22 Jul 2011 18:11:47 +0000"/>
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