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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-18466] Log when and why a query shape begins to use a different plan</title>
                <link>https://jira.mongodb.org/browse/SERVER-18466</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if a plan occasionally flips flops to a less optimal query (or a bug occurs) it can be extremely challenging (or impossible), to catch the plan cache in the bad state.&lt;/p&gt;

&lt;p&gt;Setting the QLOG on for all queries isn&apos;t reasonable as that generates too much output for high use systems.&lt;/p&gt;

&lt;p&gt;Having an option to only output the QLOG if the plan changes so that the reason for change can be recorded automatically enable the quick diagnosis of these cases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="204049">SERVER-18466</key>
            <summary>Log when and why a query shape begins to use a different plan</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="-1">Unassigned</assignee>
                                    <reporter username="charlie.page@10gen.com">Charlie Page</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 May 2015 21:34:29 +0000</created>
                <updated>Thu, 25 Jun 2015 18:36:34 +0000</updated>
                            <resolved>Wed, 20 May 2015 20:13:05 +0000</resolved>
                                                                    <component>Diagnostics</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="919648" author="rassi@10gen.com" created="Wed, 20 May 2015 20:13:05 +0000"  >&lt;p&gt;Closing this as a dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13220&quot; title=&quot;Add and expose statistics to new query framework&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13220&quot;&gt;SERVER-13220&lt;/a&gt;, which will improve the drill-down process for query plan selection issues.&lt;/p&gt;</comment>
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