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    <title>MongoDB Jira</title>
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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-9521] query slow when searching for 2 identical sub documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-9521</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;got query of type.&lt;br/&gt;
this query runs without outputing a message if primaryWord not equal secondaryWord (the first &quot;B&quot; not same as second &quot;B&quot;).&lt;br/&gt;
there&apos;s 1000&apos;s of combinations in the DB, and only those with both sub documents the same will throw the message/ run slow.&lt;br/&gt;
my workaround: i dont query for these combinations anymore.&lt;/p&gt;



&lt;p&gt;Wed May 01 06:48:28.435 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn348&amp;#93;&lt;/span&gt; query bauhaus.MDocument query: { $and: [ &lt;/p&gt;
{ _is
Deleted: false }
&lt;p&gt;, &lt;/p&gt;
{ _basedOn: &quot;$system.SearchPhraseCombination&quot; }
&lt;p&gt;, { _attributes&lt;br/&gt;
: { $elemMatch: &lt;/p&gt;
{ _basedOn: &quot;$system.PrimaryWord&quot;, _isDeleted: false, _valueText
: &quot;B&quot; }
&lt;p&gt; } }, { _attributes: { $elemMatch: &lt;/p&gt;
{ _basedOn: &quot;$system.SecondaryWord&quot;, _
isDeleted: false, _valueText: &quot;B&quot; }
&lt;p&gt; } } ] } ntoreturn:0 ntoskip:0 nscanned:28007&lt;br/&gt;
 keyUpdates:0 locks(micros) r:165221 nreturned:0 reslen:20 165ms&lt;/p&gt;</description>
                <environment>win 64</environment>
        <key id="73684">SERVER-9521</key>
            <summary>query slow when searching for 2 identical sub documents</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="david.hows">David Hows</assignee>
                                    <reporter username="thingo">wolf</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Apr 2013 20:59:43 +0000</created>
                <updated>Wed, 10 Dec 2014 23:17:55 +0000</updated>
                            <resolved>Mon, 17 Jun 2013 07:13:36 +0000</resolved>
                                    <version>2.4.3</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="346594" author="david.hows" created="Tue, 28 May 2013 05:08:09 +0000"  >&lt;p&gt;Hi Wolf,&lt;/p&gt;

&lt;p&gt;Can you explain a little more clearly what the issue you are seeing is?&lt;/p&gt;

&lt;p&gt;It sounds like you are only seeing this query in your logs when its running slow, which is expected as MongoDB will only print queries running over the &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/manage-the-database-profiler/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SlowMS&lt;/a&gt; value (default 100ms).&lt;/p&gt;

&lt;p&gt;Can you elaborate a bit, and provide &lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/cursor.explain/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explain&lt;/a&gt; output for both the good and bad queries?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
David&lt;/p&gt;</comment>
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