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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42598] Periodic slow queries  </title>
                <link>https://jira.mongodb.org/browse/SERVER-42598</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi, we&apos;re seeing periodic slow queries in our mongo logs for queries on _id and is indexed. We recently made lots of effort on trimming down our database size as well as index size and synced a new replica set so compaction happened, our indexes now should fit in memory but we are still seeing poor performance on basic queries.&lt;/p&gt;

&lt;p&gt;Attached you can find our diagnostics data&lt;/p&gt;</description>
                <environment>Ubuntu 16.04 LTS, AWS i3.16xl</environment>
        <key id="882685">SERVER-42598</key>
            <summary>Periodic slow queries  </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="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="9">Done</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="dliao@blend.com">David Liao</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Aug 2019 00:07:39 +0000</created>
                <updated>Mon, 5 Aug 2019 20:17:00 +0000</updated>
                            <resolved>Mon, 5 Aug 2019 20:17:00 +0000</resolved>
                                    <version>4.0.9</version>
                                                    <component>Performance</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2358450" author="daniel.hatcher" created="Mon, 5 Aug 2019 20:16:49 +0000"  >&lt;p&gt;From a quick look at the diagnostics, I can see that you still have some un-optimized queries. At points in time, the ratio of index keys vs documents scanned reaches 79,101.667/s : 812,876.167/s. The ideal ratio is 1:1. &lt;/p&gt;

&lt;p&gt;The SERVER project is for bugs and feature requests and this looks like a query optimization issue. As such, I encourage you to ask our community for further help by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;</comment>
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                            <attachment id="226022" name="diag.zip" size="95909881" author="dliao@blend.com" created="Fri, 2 Aug 2019 00:07:13 +0000"/>
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