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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-33753] count without predicate should be sharding aware</title>
                <link>https://jira.mongodb.org/browse/SERVER-33753</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A &quot;fast count&quot; (a count &lt;em&gt;without&lt;/em&gt; a predicate) currently works by just reading collection metadata. While this is very fast, it may be inaccurate on sharded clusters if there are orphan documents.&lt;/p&gt;

&lt;p&gt;This is follow-on work after &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;, which made counts with predicates sharding aware. Although fixing this would cause the count command to be slower, users who need an extremely fast way to get an approximate number of documents in a collection could use &lt;tt&gt;$collStats&lt;/tt&gt; (see below).&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;Workarounds%3A&quot;&gt;&lt;/a&gt;Workarounds:&lt;/h3&gt;

&lt;p&gt;In general, if one needs an accurate count of how many documents are in a collection, we do not recommend using the count command. Instead, we suggest using the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/count/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$count aggregation stage&lt;/a&gt;, like this:&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;
		&lt;tbody &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;  margin-top: 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;db.foo.aggregate([{$count: &quot;nDocs&quot;}]);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;For users who need the performance of &quot;fast count&quot;, and are okay with approximate results, we suggest using the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/collStats/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$collStats aggregation stage&lt;/a&gt; instead of the count command:&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;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;  margin-top: 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;db.foo.aggregate( [ { $collStats: { count: { } } } ] )&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="507965">SERVER-33753</key>
            <summary>count without predicate should be sharding aware</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Thu, 8 Mar 2018 19:13:02 +0000</created>
                <updated>Wed, 7 Jun 2023 13:53:49 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="2410876" author="lucasoares" created="Fri, 6 Sep 2019 16:21:27 +0000"  >&lt;p&gt;Hello. I would like to see this being implemented.&lt;/p&gt;

&lt;p&gt;Thanks.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="21174">SERVER-3645</issuekey>
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