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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9298] When logging slow queries, either log the name of the index used or indicate that it was a table scan</title>
                <link>https://jira.mongodb.org/browse/SERVER-9298</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For example, the log message for a slow query might look something like&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 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;Sun Apr  7 06:53:36 [conn42787593] query blahblah_production.posts query: { app_id: ObjectId(&apos;50d2a13fdf52405ff40ffcfa&apos;) } ntoreturn:0 ntoskip:0 nscanned:19869 index:TABLESCAN keyUpdates:0 numYields: 1 locks(micros) r:216562 nreturned:0 reslen:20 113ms&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Having this info in the log would be useful because:&lt;/p&gt;

&lt;p&gt;1) it distinguishes between incidents where a query was slow because it just used an index with poor selectivity, versus when it had no index at all.&lt;br/&gt;
2) it becomes easier to locate when the application is missing indexes without needing to rely on the invasive &quot;--notablescan&quot; option, which is often not acceptable in production environments.&lt;br/&gt;
3) the logs become greppable to find which indexes are involved in the most slow queries, which helps with optimization.&lt;br/&gt;
4) nscanned/nscannedobj is often misunderstood or ignored by users. This would help to clarify the relationship between nscanned/nscannedobj and the index that is chosen.&lt;/p&gt;</description>
                <environment></environment>
        <key id="71225">SERVER-9298</key>
            <summary>When logging slow queries, either log the name of the index used or indicate that it was a table scan</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="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="-1">Unassigned</assignee>
                                    <reporter username="mikeo@mongodb.com">Michael O&apos;Brien</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Apr 2013 14:37:51 +0000</created>
                <updated>Tue, 9 Apr 2013 14:46:54 +0000</updated>
                            <resolved>Tue, 9 Apr 2013 14:46:45 +0000</resolved>
                                                                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="309382" author="scotthernandez" created="Tue, 9 Apr 2013 14:46:45 +0000"  >&lt;p&gt;Dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7754&quot; title=&quot;add index/query plan to currentOp and slow query log&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7754&quot;&gt;&lt;del&gt;SERVER-7754&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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