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    <title>MongoDB Jira</title>
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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-37308] Log queries with high ratio of scanned / returned</title>
                <link>https://jira.mongodb.org/browse/SERVER-37308</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should log queries with high ratio of scanned / returned regardless of their execution time to help find inefficient queries.&lt;/p&gt;

&lt;hr /&gt;

&lt;p&gt;This is now possible with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49102&quot; title=&quot;Accept a filter expression as an alternative to slowMS/sampleRate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49102&quot;&gt;&lt;del&gt;SERVER-49102&lt;/del&gt;&lt;/a&gt; fixed. Each database can be configured with a filter (a query predicate) that controls which operations are logged.&lt;/p&gt;

&lt;p&gt;For example, this filter will log queries where the ratio of index keys examined to documents returned is greater than 100:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;        {$multiply: [&quot;$nreturned&quot;, 100]},&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="609481">SERVER-37308</key>
            <summary>Log queries with high ratio of scanned / returned</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="tomer.yakir@mongodb.com">Tomer Yakir</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Sep 2018 06:05:19 +0000</created>
                <updated>Tue, 6 Dec 2022 03:17:23 +0000</updated>
                            <resolved>Wed, 23 Sep 2020 16:15:40 +0000</resolved>
                                                                    <component>Logging</component>
                                        <votes>27</votes>
                                    <watches>46</watches>
                                                                                                                <comments>
                            <comment id="3407635" author="david.percy" created="Wed, 23 Sep 2020 16:15:40 +0000"  >&lt;p&gt;This is possible now, with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49102&quot; title=&quot;Accept a filter expression as an alternative to slowMS/sampleRate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49102&quot;&gt;&lt;del&gt;SERVER-49102&lt;/del&gt;&lt;/a&gt; fixed. I&apos;ve updated the ticket description with an example.&lt;/p&gt;</comment>
                            <comment id="2166937" author="sergio.castro" created="Fri, 1 Mar 2019 01:11:20 +0000"  >&lt;p&gt;+1&lt;/p&gt;</comment>
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