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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22743] Provide fast (estimated) count command</title>
                <link>https://jira.mongodb.org/browse/SERVER-22743</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today, depending on the context used, when .count() is used it will either do an expensive count operation to ensure accurate results, or it will invoke a data structure through a routine called fastCount that provides a rough estimate of the number of documents in a collection/database. &lt;/p&gt;

&lt;p&gt;This can be confusing to users who expect the count operation to be an accurate precise count every time. &lt;/p&gt;

&lt;p&gt;We should deprecate count command and add a countEstimate command. countEstimate will be O(1) though inaccurate and whenever users require an accurate count they should use the aggregation framework&apos;s facility for counting. The name countEstimate should be used in the stats data as well for clarity. &lt;/p&gt;</description>
                <environment></environment>
        <key id="266591">SERVER-22743</key>
            <summary>Provide fast (estimated) count command</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="osmar.olivo">Osmar Olivo</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Feb 2016 21:25:25 +0000</created>
                <updated>Wed, 14 Jun 2017 14:09:04 +0000</updated>
                            <resolved>Wed, 14 Jun 2017 14:09:04 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1596568" author="david.storch" created="Wed, 14 Jun 2017 14:08:37 +0000"  >&lt;p&gt;We are no longer planning to add a &lt;tt&gt;countEstimate&lt;/tt&gt; command, so I am closing this ticket as &quot;Won&apos;t Fix&quot;. Instead, we plan to implement &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29620&quot; title=&quot;Add shorthand syntax for retrieving the record count for a collection using the $collStats agg stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29620&quot;&gt;&lt;del&gt;SERVER-29620&lt;/del&gt;&lt;/a&gt;, which will make it easy to perform a fast estimated count using the aggregation framework. The syntax for retrieving the count will use the &lt;tt&gt;$collStats&lt;/tt&gt; stage, which helps to clearly separate counting via query execution from counting by retrieving the approximate record count metadata. Count command will continue to conditionally use these &quot;fast&quot; and &quot;slow&quot; paths depending on the presence of a predicate, but the aggregation command will separately implement the fast and slow paths via &lt;tt&gt;$collStats&lt;/tt&gt; and &lt;tt&gt;$count&lt;/tt&gt; respectively.&lt;/p&gt;</comment>
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