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    <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-83549] Mongodb V 7.02 Atlas not using indexes as expected</title>
                <link>https://jira.mongodb.org/browse/SERVER-83549</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When i was checking profiler for slow queries i found a query that is marked as slow and it makes a memory sort and scans +58000 index keys&lt;/p&gt;

&lt;p&gt;When i took the same query and i put it inside &lt;b&gt;compass or from the shell&lt;/b&gt; it scans only 158 keys and no memory sort! This happens only when the query is coming from nodejs code using mongoose Version 8&lt;br/&gt;
i made a new M10 atlas cluster on v6.0.5 and tested it again from the nodejs app and it was used as expected this means the issue in v7&#160;&lt;/p&gt;



&lt;p&gt;here is the result for the another query&lt;/p&gt;

&lt;p&gt;this is the output of the profiler&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/491943/491943_profiler-parsed-query.json&quot; title=&quot;profiler-parsed-query.json attached to SERVER-83549&quot;&gt;profiler-parsed-query.json&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;and here is the full explain for the same query from compass (match and sort)&lt;br/&gt;
&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/491942/491942_compass-explain.json&quot; title=&quot;compass-explain.json attached to SERVER-83549&quot;&gt;compass-explain.json&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;and here is a list of all indexes on that collection&lt;br/&gt;
&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/491941/491941_users-indexes.json&quot; title=&quot;users-indexes.json attached to SERVER-83549&quot;&gt;users-indexes.json&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;You will notice in profiler report and the explain of compass the same index is used in both of them!&lt;br/&gt;
even though there is a big difference in examined keys&lt;/p&gt;


&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://www.mongodb.com/community/forums/uploads/default/original/3X/0/b/0bb23b65476485157ef3b7926f31878c8a4e04f2.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://www.mongodb.com/community/forums/uploads/default/original/3X/8/0/80c15e1ec817257cb54218e0d446bf41eea297e5.jpeg&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2507815">SERVER-83549</key>
            <summary>Mongodb V 7.02 Atlas not using indexes as expected</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="12450" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Verification</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-triage">Backlog - Triage Team</assignee>
                                    <reporter username="ahmed@ahmednaser.me">Ahmed Naser</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Nov 2023 22:34:48 +0000</created>
                <updated>Wed, 13 Dec 2023 21:54:23 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                        <attachments>
                            <attachment id="491942" name="compass-explain.json" size="368040" author="ahmed@ahmednaser.me" created="Wed, 22 Nov 2023 22:31:48 +0000"/>
                            <attachment id="491943" name="profiler-parsed-query.json" size="3742" author="ahmed@ahmednaser.me" created="Wed, 22 Nov 2023 22:31:23 +0000"/>
                            <attachment id="491941" name="users-indexes.json" size="12582" author="ahmed@ahmednaser.me" created="Wed, 22 Nov 2023 22:31:59 +0000"/>
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