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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-5032] unnecessarily large nScanned occurs during sharded $in queries with sort() and limit()</title>
                <link>https://jira.mongodb.org/browse/SERVER-5032</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A large number of nScannedObjects occurs when a sharded $in query contains both a limit() and sort() clause.  &lt;/p&gt;

&lt;p&gt;For example, we have a checkins collection which is sharded by &lt;/p&gt;
{uid: 1}
&lt;p&gt; and contains the index &lt;/p&gt;
{uid: 1, _id: -1}
&lt;p&gt;.  A db.checkins.find({uid: {$in: &lt;span class=&quot;error&quot;&gt;&amp;#91;400438&amp;#93;&lt;/span&gt;}}).limit(2).sort({_id: -1}) will scan just the two documents returned.  db.checkins.find({uid: {$in: &lt;span class=&quot;error&quot;&gt;&amp;#91;400438, 32&amp;#93;&lt;/span&gt;}}).limit(2).sort({_id: -1}) will scan thousands of documents.&lt;/p&gt;

&lt;p&gt;The attachment walks through the example with an interactive console.&lt;/p&gt;</description>
                <environment></environment>
        <key id="31171">SERVER-5032</key>
            <summary>unnecessarily large nScanned occurs during sharded $in queries with sort() and limit()</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="davidwas">David Wasserstrum</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Feb 2012 00:38:21 +0000</created>
                <updated>Fri, 7 Mar 2014 00:57:15 +0000</updated>
                            <resolved>Wed, 22 Feb 2012 03:09:28 +0000</resolved>
                                    <version>1.8.2</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="90713" author="eliot" created="Wed, 22 Feb 2012 03:09:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3310&quot; title=&quot;Query optimizer should efficiently handle $in and sort with compound index.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3310&quot;&gt;&lt;del&gt;SERVER-3310&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="90699" author="davidwas" created="Wed, 22 Feb 2012 02:00:46 +0000"  >&lt;p&gt;Yes Aaron. Thank you for bringing &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3310&quot; title=&quot;Query optimizer should efficiently handle $in and sort with compound index.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3310&quot;&gt;&lt;del&gt;SERVER-3310&lt;/del&gt;&lt;/a&gt; to our attention.  You can resolve this as a duplicate.&lt;/p&gt;</comment>
                            <comment id="90682" author="aaron" created="Wed, 22 Feb 2012 01:03:47 +0000"  >&lt;p&gt;Hi David - would &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3310&quot; title=&quot;Query optimizer should efficiently handle $in and sort with compound index.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3310&quot;&gt;&lt;del&gt;SERVER-3310&lt;/del&gt;&lt;/a&gt; cover this for you?&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="14978" name="mongolargenScannedduringsortedINqueriesonshards.pdf" size="76949" author="davidwas" created="Wed, 22 Feb 2012 00:38:21 +0000"/>
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