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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-486] Two indexes same field, one ascending, one descending, cause no index to be used</title>
                <link>https://jira.mongodb.org/browse/SERVER-486</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I had a collection that had two indexes, one ascending, and one descending&lt;/p&gt;

&lt;p&gt;mongo&amp;gt; db.url.getIndexes()&lt;br/&gt;
        {&lt;br/&gt;
                &quot;_id&quot; : ObjectId(&quot;4b1651417fc9cc6b089203f6&quot;),&lt;br/&gt;
                &quot;ns&quot; : &quot;scan_stats.url&quot;,&lt;br/&gt;
                &quot;key&quot; : &lt;/p&gt;
{
                        &quot;hours.velocity&quot; : 1
                }
&lt;p&gt;,&lt;br/&gt;
                &quot;name&quot; : &quot;hours_velocity_1&quot;,&lt;br/&gt;
                &quot;unique&quot; : false&lt;br/&gt;
       },&lt;br/&gt;
       {&lt;br/&gt;
                &quot;ns&quot; : &quot;scan_stats.url&quot;,&lt;br/&gt;
                &quot;key&quot; : &lt;/p&gt;
{
                        &quot;hours.velocity&quot; : -1
                }
&lt;p&gt;,&lt;br/&gt;
                &quot;name&quot; : &quot;hours.velocity_-1&quot;&lt;br/&gt;
        }&lt;/p&gt;

&lt;p&gt;This query was taking 6 seconds:&lt;/p&gt;

&lt;p&gt;Tue Dec 15 01:37:14 query scan_stats.url ntoreturn:1 reslen:224 nscanned:9236896 { hours.velocity: &lt;/p&gt;
{ $gt: 0.0 }
&lt;p&gt; }  nreturned:1 6934&lt;br class=&quot;atl-forced-newline&quot; /&gt;&lt;/p&gt;

&lt;p&gt;I removed the unnecessary index (the ascending one), and then the query became instantaneous.&lt;/p&gt;</description>
                <environment>unix</environment>
        <key id="11006">SERVER-486</key>
            <summary>Two indexes same field, one ascending, one descending, cause no index to be used</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="5">Cannot Reproduce</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="douggreen">Doug Green</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Dec 2009 20:53:51 +0000</created>
                <updated>Fri, 15 Jan 2010 01:34:46 +0000</updated>
                            <resolved>Mon, 14 Dec 2009 21:11:25 +0000</resolved>
                                    <version>1.1.4</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="11366" author="eliot" created="Mon, 14 Dec 2009 21:11:25 +0000"  >&lt;p&gt;I can&apos;t reproduce this.  &lt;br/&gt;
added this test: &lt;a href=&quot;http://github.com/mongodb/mongo/commit/c6420d62e0748d5df85cc0499126c3e797c3f6cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/c6420d62e0748d5df85cc0499126c3e797c3f6cc&lt;/a&gt;&lt;br/&gt;
which seems to work fine.&lt;br/&gt;
if you could send the explain() or a test that shows it, would be very helpful&lt;/p&gt;</comment>
                            <comment id="11365" author="auto" created="Mon, 14 Dec 2009 21:10:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: test for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-486&quot; title=&quot;Two indexes same field, one ascending, one descending, cause no index to be used&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-486&quot;&gt;&lt;del&gt;SERVER-486&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/c6420d62e0748d5df85cc0499126c3e797c3f6cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/c6420d62e0748d5df85cc0499126c3e797c3f6cc&lt;/a&gt;&lt;/p&gt;</comment>
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