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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-24079] Different result between db.count and db.find</title>
                <link>https://jira.mongodb.org/browse/SERVER-24079</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi Team,&lt;/p&gt;

&lt;p&gt;I have a very weird problem, when I run db.count the command returns 2 but when I run db.find the command returns only one.&lt;/p&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.xxx.count({ &quot;_id&quot; : &quot;xxx1787319235&quot;});&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongos&amp;gt; db.xxx.find({ &quot;_id&quot; : &quot;xxx1787319235&quot;}, {yyy:1});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id&quot; : &quot;xxx1787319235&quot;, &quot;yyy&quot; : &quot;1e1805a52ef44173233082e34e4175df07288f2ea0928a5e05217a9d969a2ef3&quot; }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="285039">SERVER-24079</key>
            <summary>Different result between db.count and db.find</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="PM">Pierre MOELO [X]</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 May 2016 14:51:24 +0000</created>
                <updated>Tue, 10 May 2016 15:10:51 +0000</updated>
                            <resolved>Tue, 10 May 2016 15:10:16 +0000</resolved>
                                    <version>3.2.6</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1260781" author="thomas.schubert" created="Tue, 10 May 2016 15:10:16 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=PM&quot; class=&quot;user-hover&quot; rel=&quot;PM&quot;&gt;PM&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3645&quot; title=&quot;Sharded collection counts (on primary) can report too many results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3645&quot;&gt;&lt;del&gt;SERVER-3645&lt;/del&gt;&lt;/a&gt; fix version is &quot;planned but not scheduled,&quot; which indicates that it is not being actively worked on, but may be scheduled in the future. We are aware that this issue may impact a number of users and have included notes in our &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/count/#behavior&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation&lt;/a&gt; that describe this behavior and offer a work around. &lt;/p&gt;

&lt;p&gt;Thank you for your help identifying the root cause of this issue,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1259049" author="pm" created="Mon, 9 May 2016 09:28:16 +0000"  >&lt;p&gt;Hi @Thomas&lt;/p&gt;

&lt;p&gt;I confirm that we are on a sharded cluster.&lt;br/&gt;
No update for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3645&quot; title=&quot;Sharded collection counts (on primary) can report too many results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3645&quot;&gt;&lt;del&gt;SERVER-3645&lt;/del&gt;&lt;/a&gt; since November 2015 ?&lt;/p&gt;

&lt;p&gt;Thank you,&lt;/p&gt;</comment>
                            <comment id="1257796" author="thomas.schubert" created="Fri, 6 May 2016 16:17:28 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=PM&quot; class=&quot;user-hover&quot; rel=&quot;PM&quot;&gt;PM&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Can you please confirm you are observing this behavior on a sharded cluster?&lt;/p&gt;

&lt;p&gt;If so, I think this issue is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3645&quot; title=&quot;Sharded collection counts (on primary) can report too many results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3645&quot;&gt;&lt;del&gt;SERVER-3645&lt;/del&gt;&lt;/a&gt;, where the count command does not filter out unowned documents and returns a larger value than a normal query would. Please feel to vote for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3645&quot; title=&quot;Sharded collection counts (on primary) can report too many results&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3645&quot;&gt;&lt;del&gt;SERVER-3645&lt;/del&gt;&lt;/a&gt; and watch it for updates.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas &lt;/p&gt;</comment>
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