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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-25389] &apos;Count&apos; function doesnt work with large dataset</title>
                <link>https://jira.mongodb.org/browse/SERVER-25389</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a collection with more than 100M records, We have created index on the search fields, however, it takes lots of time to return count , most of the times, it doesnt return anything. Below are the configuration details of MongoDB,&lt;/p&gt;

&lt;p&gt;Server Core: 12&lt;br/&gt;
RAM: 32G&lt;br/&gt;
Engine: WiredTiger&lt;br/&gt;
Collection Size:100G&lt;/p&gt;

&lt;p&gt;Please suggest .....&lt;/p&gt;

&lt;p&gt;Thanks....&lt;/p&gt;</description>
                <environment></environment>
        <key id="305784">SERVER-25389</key>
            <summary>&apos;Count&apos; function doesnt work with large dataset</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="4">Incomplete</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="abhishek.mishra@cheersin.com">abhishek mishra</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Aug 2016 08:12:14 +0000</created>
                <updated>Tue, 6 Sep 2016 16:44:55 +0000</updated>
                            <resolved>Tue, 6 Sep 2016 16:44:55 +0000</resolved>
                                    <version>3.2.0</version>
                                                    <component>Admin</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1377401" author="thomas.schubert" created="Tue, 6 Sep 2016 16:44:55 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=abhishek.mishra%40cheersin.com&quot; class=&quot;user-hover&quot; rel=&quot;abhishek.mishra@cheersin.com&quot;&gt;abhishek.mishra@cheersin.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1344382" author="ramon.fernandez" created="Tue, 2 Aug 2016 12:24:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=abhishek.mishra%40cheersin.com&quot; class=&quot;user-hover&quot; rel=&quot;abhishek.mishra@cheersin.com&quot;&gt;abhishek.mishra@cheersin.com&lt;/a&gt;, unfortunately there&apos;s not enough information here to determine if you&apos;ve found a bug or if this is expected behavior.&lt;/p&gt;

&lt;p&gt;Can you please:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;elaborate on the meaning of &quot;doesnt work&quot; in the ticket title? Is the operation taking a long time to complete? Is is returning incorrect results?&lt;/li&gt;
	&lt;li&gt;upload the &lt;tt&gt;mongod&lt;/tt&gt; logs for the node where you&apos;re issuing the &lt;tt&gt;count()&lt;/tt&gt; query during the time you&apos;re running this operation?&lt;/li&gt;
	&lt;li&gt;provide the list of indexes you have on the affected collection as well as the exact &lt;tt&gt;count()&lt;/tt&gt; operation you&apos;re running?&lt;/li&gt;
	&lt;li&gt;provide the output of the &lt;tt&gt;count()&lt;/tt&gt; operation when run with &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/explain/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;explain()&lt;/tt&gt;&lt;/a&gt;?&lt;/li&gt;
	&lt;li&gt;provide details about your setup. Is this a replica set? A sharded cluster?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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