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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-26084] Add statement-level statistics to the query plan cache (or elsewhere)</title>
                <link>https://jira.mongodb.org/browse/SERVER-26084</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current timeseries implementation allows us to infer how often WT I/O requests result in a WT cache hit vs not.  &lt;/p&gt;

&lt;p&gt;I define a logical I/O as a single request for a block or page (whatever our most granular request is) whether from cache or disk.&lt;/p&gt;

&lt;p&gt;Is there explicit tooling that would let us&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;aggregate the actual number of logical I/Os for a given query shape&lt;/li&gt;
	&lt;li&gt;aggregate the actual number of logical I/Os for all query shapes&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;and then for the above&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;aggregate the number of times the logical I/O was serviced by a WT cache hit&lt;/li&gt;
	&lt;li&gt;aggregate the number of times the logical I/O was serviced by a filesystem cache hit&lt;/li&gt;
	&lt;li&gt;aggregate the number of times the logical I/O resulted in a physical I/O request&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="315165">SERVER-26084</key>
            <summary>Add statement-level statistics to the query plan cache (or elsewhere)</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="shakir.sadikali@mongodb.com">Shakir Sadikali</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Sep 2016 14:16:27 +0000</created>
                <updated>Tue, 6 Dec 2022 04:16:56 +0000</updated>
                                                            <fixVersion>Needs Further Definition</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Querying</component>
                    <component>WiredTiger</component>
                                        <votes>6</votes>
                                    <watches>72</watches>
                                                                                                                <comments>
                            <comment id="3043226" author="asya" created="Thu, 16 Apr 2020 19:44:54 +0000"  >&lt;p&gt;Note that the storage access piece of this was implemented in &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 available in 4.0.9 and later.&lt;/p&gt;</comment>
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