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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-23017] Fast approximate count with predicate</title>
                <link>https://jira.mongodb.org/browse/SERVER-23017</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;ve indexed the queried fields, which makes the count works very fast when nobody is updating documents in the collection, but whenever i start more workers, or whenever there is some load, the output is very slow:&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;   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;2016-03-09T00:58:22.805+0200 I COMMAND  [conn2451] command squeue.in_auth command: count { count: &quot;in_auth&quot;, query: { payload.group: &quot;group1&quot; } } planSummary: COUNT_SCAN { payload.group: 1.0, payload.customer: 1.0 } keyUpdates:0 writeConflicts:0 numYields:8125 reslen:122 locks:{ Global: { acquireCount: { r: 16252 } }, Database: { acquireCount: { r: 8126 } }, Collection: { acquireCount: { r: 8126 } } } protocol:op_query 511ms&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Is there any way to make an approximative, but FAST count which ignores the updates? It doesn&apos;t matter if it displays a few hundred more or less items in a collection with 10 million docs.&lt;/p&gt;

&lt;p&gt;I&apos;m on a sharded cluster btw (8 rs).&lt;/p&gt;</description>
                <environment></environment>
        <key id="270985">SERVER-23017</key>
            <summary>Fast approximate count with predicate</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="thestick613">Tudor Aursulesei</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Mar 2016 23:07:17 +0000</created>
                <updated>Tue, 6 Dec 2022 04:31:29 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>6</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="1516200" author="thestick613" created="Sun, 5 Mar 2017 08:33:26 +0000"  >&lt;p&gt;How difficult is this feature? Does it take more than a few hours of work?&lt;/p&gt;</comment>
                            <comment id="1398443" author="thestick613" created="Sun, 2 Oct 2016 08:48:56 +0000"  >&lt;p&gt;Any update on this? Most people who use mongo just store a large amount of rows in a collection, then create some indexes on the fields and expect a reasonable fast count. When you insert, update or delete data in those rows the counts become very sluggish. Just google for &quot;mongo slow count&quot; and you&apos;ll find lots of reports.&lt;/p&gt;</comment>
                            <comment id="1199525" author="thomas.schubert" created="Thu, 10 Mar 2016 19:50:11 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=thestick613&quot; class=&quot;user-hover&quot; rel=&quot;thestick613&quot;&gt;thestick613&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for opening this improvement request. I am marking this ticket to be considered during the next round of planning. Please continue to watch this ticket for updates.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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            <issuekey id="677906">SERVER-39191</issuekey>
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