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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-41343] Add parameter for explain() to bound the trial phase</title>
                <link>https://jira.mongodb.org/browse/SERVER-41343</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Presently, all verbosity modes for &lt;tt&gt;explain()&lt;/tt&gt;&#160;invoke the query planner.&#160; This means that the operation is subject to the general &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1041dd848e25e879260d1015d8da4f72ee7993fe/src/mongo/db/exec/multi_plan.cpp#L203-L213&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;trial phase termination logic&lt;/a&gt;.&#160; In some cases, such as when&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31078&quot; title=&quot;Query planning is very slow during multiplanning when result set is empty&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31078&quot;&gt;SERVER-31078&lt;/a&gt; is encountered, &lt;tt&gt;explain()&lt;/tt&gt; can run for an extended period of time without returning results.&#160; This behavior can be undesirable when attempting to gather information from a production environment.&#160;&#160;&lt;/p&gt;

&lt;p&gt;We should consider introducing a new parameter to &lt;tt&gt;explain()&lt;/tt&gt; which could be used to bound the maximum amount of work done during the trial phase.&#160; This could be used to alleviate concerns regarding the impact of gathering &lt;tt&gt;explain()&lt;/tt&gt; output in certain situations.&#160; While usage of this parameter&#160;&lt;em&gt;could&lt;/em&gt; result in different plan selection than normal due to the sample size, it is likely generally desirable to be able to gather that output rather than none at all.&#160;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="778894">SERVER-41343</key>
            <summary>Add parameter for explain() to bound the trial phase</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="christopher.harris@mongodb.com">Chris Harris</reporter>
                        <labels>
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                <created>Tue, 28 May 2019 19:19:26 +0000</created>
                <updated>Tue, 6 Dec 2022 02:58:40 +0000</updated>
                            <resolved>Thu, 20 Jun 2019 19:32:51 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2291928" author="craig.homa" created="Thu, 20 Jun 2019 19:32:51 +0000"  >&lt;p&gt;Although we might consider something like this in the future, this is immediately achievable with maxTimeMS.&lt;/p&gt;

&lt;p&gt;For users who want to see all candidate plans without spending the resources to select a winner, we have an open feature request in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17009&quot; title=&quot;New explain mode &amp;quot;listPlans&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17009&quot;&gt;SERVER-17009&lt;/a&gt;.&lt;/p&gt;</comment>
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