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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-3493] count command should give indexinfo</title>
                <link>https://jira.mongodb.org/browse/SERVER-3493</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&amp;gt; db.index.find().count().explain();&lt;br/&gt;
Wed Jul 27 16:51:45 TypeError: db.index.find().count().explain is not a function (shell):1&lt;/p&gt;

&lt;p&gt;other ways to call count with explain i have tried also fail similarly.&lt;/p&gt;

&lt;p&gt;how do i know if mongod optimizes count query correctly if i can&apos;t &quot;explain&quot; it?&lt;/p&gt;</description>
                <environment>centos x64 mongo-10gen-server-1.8.2-mongodb_1</environment>
        <key id="20202">SERVER-3493</key>
            <summary>count command should give indexinfo</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="ootada">ttt</reporter>
                        <labels>
                    </labels>
                <created>Wed, 27 Jul 2011 14:03:56 +0000</created>
                <updated>Wed, 10 Dec 2014 23:04:57 +0000</updated>
                            <resolved>Wed, 15 Oct 2014 00:17:37 +0000</resolved>
                                    <version>1.8.2</version>
                                                    <component>Index Maintenance</component>
                    <component>Querying</component>
                                        <votes>7</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="741274" author="david.storch" created="Wed, 15 Oct 2014 00:17:08 +0000"  >&lt;p&gt;Explain work being done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10448&quot; title=&quot;Revamp explain() formatting&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10448&quot;&gt;&lt;del&gt;SERVER-10448&lt;/del&gt;&lt;/a&gt; will allow explain to be run on count operations. Closing as a duplicate.&lt;/p&gt;</comment>
                            <comment id="688165" author="niccottrell" created="Tue, 12 Aug 2014 15:29:35 +0000"  >&lt;p&gt;I&apos;m suddenly getting very slow results for count after upgrading 2.6.3-&amp;gt;2.6.4. Query is like:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;</comment>
                            <comment id="491393" author="sylvinus" created="Fri, 31 Jan 2014 10:16:49 +0000"  >&lt;p&gt;The issue I&apos;m having now is very slow counts on big collections, even if they query only indexed fields by exact values.&lt;/p&gt;

&lt;p&gt;It&apos;s pretty hard to debug because find().explain() timeouts. If I do find().limit(10).explain() I do see the index being used but it still leaves me wondering what&apos;s happening with the counts!&lt;/p&gt;

&lt;p&gt;So, some kind of way to debug slow counts besides doing find().explain() would be very helpful.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;/p&gt;</comment>
                            <comment id="70247" author="christopher.price@mtvn.com" created="Thu, 1 Dec 2011 21:36:42 +0000"  >&lt;p&gt;How do we know for sure that it is using the same index?&lt;/p&gt;</comment>
                            <comment id="44794" author="eliot" created="Wed, 27 Jul 2011 14:06:54 +0000"  >&lt;p&gt;In general count() uses the same index as a normal query.&lt;br/&gt;
So its the same as find().explain()&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="84947">SERVER-10448</issuekey>
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