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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-1380] support maxScan in count command</title>
                <link>https://jira.mongodb.org/browse/SERVER-1380</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Jay requested this for the Python driver - but really requires server support. Not sure what version to schedule for, so leaving up to you.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12382">SERVER-1380</key>
            <summary>support maxScan in count command</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="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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="mike">Michael Dirolf</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Jul 2010 14:06:29 +0000</created>
                <updated>Tue, 6 Dec 2022 05:48:59 +0000</updated>
                            <resolved>Wed, 14 Feb 2018 16:17:00 +0000</resolved>
                                                                    <component>Usability</component>
                                        <votes>4</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1805653" author="david.storch" created="Wed, 14 Feb 2018 16:17:00 +0000"  >&lt;p&gt;The maxScan feature is being deprecated (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32953&quot; title=&quot;Log a deprecation warning when the maxScan find option is used.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32953&quot;&gt;&lt;del&gt;SERVER-32953&lt;/del&gt;&lt;/a&gt;), so we do not plan to add this feature. Closing as &quot;Won&apos;t Fix&quot;.&lt;/p&gt;</comment>
                            <comment id="83153" author="jober" created="Sun, 29 Jan 2012 14:32:22 +0000"  >&lt;p&gt;This would be a really good feature, since count() just runs unitil it has nothing left to count (even if you use the &apos;limit&apos;-parameter in the PHP-driver).&lt;/p&gt;

&lt;p&gt;If it doesn&apos;t scan all documents and runs indexOnly, it may sometimes go way faster to just let the server scan those few documents instead of counting 100% via the index.&lt;/p&gt;

&lt;p&gt;As an example, if I put a maxScan of 1001 (i.e. if there are more than 1k items, just show the user that there are 1k+ items in this range), it will run much faster than doing a count() via indexOnly, if the counts finishes on, say 40.000 (my benches were like 1-2ms vs. 110-119ms)&lt;/p&gt;

&lt;p&gt;So the poor-mans-solution for this is to simply run an explain() on a normal find()-query with maxScan enabled, i.e. find({a:1,b:{&apos;$gte&apos;:23324 ,&apos;$lte&apos;:82409}}).addSpecial(&apos;$maxScan&apos;, 1001).explain() and simply fetch the &apos;n&apos;-key from the explain output (which isn&apos;t perfect, but it does the job)&lt;/p&gt;</comment>
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