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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26953] Track bytes read into cache per query</title>
                <link>https://jira.mongodb.org/browse/SERVER-26953</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When slow queries are logged we include information about documents and index entries scanned to help diagnose performance issues. However that information doesn&apos;t tell us whether the documents or index entries scanned were in cache or not, and if they are not in cache they can have a much more significant performance impact. Reporting bytes read into cache for each query logged would help diagnose the cause of performance issues related to cache pressure.&lt;/p&gt;

&lt;p&gt;This might be accomplished by tracking bytes read into cache per cursor or per session in WT, and computing the difference between the value of this counter before and after each query. Query performance impact would need to be evaluated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="330497">SERVER-26953</key>
            <summary>Track bytes read into cache per query</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="bruce.lucas@mongodb.com">Bruce Lucas</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>SWDI</label>
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                <created>Tue, 8 Nov 2016 18:18:53 +0000</created>
                <updated>Tue, 15 Jan 2019 17:12:24 +0000</updated>
                            <resolved>Tue, 15 Jan 2019 17:12:24 +0000</resolved>
                                                                    <component>Diagnostics</component>
                    <component>WiredTiger</component>
                                        <votes>33</votes>
                                    <watches>26</watches>
                                                                                                                <comments>
                            <comment id="2115857" author="thomas.schubert" created="Tue, 15 Jan 2019 17:12:24 +0000"  >&lt;p&gt;This work was completed under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38240&quot; title=&quot;Extend OpDebug object to support storage statistics &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38240&quot;&gt;&lt;del&gt;SERVER-38240&lt;/del&gt;&lt;/a&gt; and is being documented under &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12332&quot; title=&quot;Docs for SERVER-38240: Extend OpDebug object to support storage statistics &quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12332&quot;&gt;&lt;del&gt;DOCS-12332&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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