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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-509] Explain() works by re-generates the query plan: this can affect timing</title>
                <link>https://jira.mongodb.org/browse/DOCS-509</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;When running a query using the explain() functionality, this will cause the query engine to re-calculate the query plan.  This, in turn, can cause some queries to run slower.  If you&apos;re timing queries, you shouldn&apos;t use explain(); if you&apos;re explain()ing queries you shouldn&apos;t trust the timing.&lt;/p&gt;

&lt;p&gt;This is not called out in the documentation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="50119">DOCS-509</key>
            <summary>Explain() works by re-generates the query plan: this can affect timing</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Sep 2012 18:02:01 +0000</created>
                <updated>Tue, 25 Sep 2012 23:02:40 +0000</updated>
                            <resolved>Mon, 10 Sep 2012 18:12:54 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="168001" author="auto" created="Tue, 25 Sep 2012 23:02:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-09-25T15:48:22-07:00&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-509&quot; title=&quot;Explain() works by re-generates the query plan: this can affect timing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-509&quot;&gt;&lt;del&gt;DOCS-509&lt;/del&gt;&lt;/a&gt; minor style change&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/56c380676ade1fe04964ce955aa5a37e3558d4ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/56c380676ade1fe04964ce955aa5a37e3558d4ed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="167992" author="auto" created="Tue, 25 Sep 2012 23:02:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-09-25T15:48:22-07:00&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-509&quot; title=&quot;Explain() works by re-generates the query plan: this can affect timing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-509&quot;&gt;&lt;del&gt;DOCS-509&lt;/del&gt;&lt;/a&gt; minor style change&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/56c380676ade1fe04964ce955aa5a37e3558d4ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/56c380676ade1fe04964ce955aa5a37e3558d4ed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="162513" author="auto" created="Mon, 10 Sep 2012 18:12:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-09-10T11:12:35-07:00&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-509&quot; title=&quot;Explain() works by re-generates the query plan: this can affect timing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-509&quot;&gt;&lt;del&gt;DOCS-509&lt;/del&gt;&lt;/a&gt; note about timing and explain&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8ddde6ea096b1b2edb4ddac15e84c28a7529d7a6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8ddde6ea096b1b2edb4ddac15e84c28a7529d7a6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="162507" author="scotthernandez" created="Mon, 10 Sep 2012 18:06:27 +0000"  >&lt;p&gt;Yes, explain is not for timing things but only for seeing &lt;b&gt;how&lt;/b&gt; they work.&lt;/p&gt;</comment>
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