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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>[SERVER-20139] Enable CachedPlanStage replanning by default in 3.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-20139</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Aug 26, 2015&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
The query optimizer caches plans for each query shape and reuses these plans for a time. In situations where the performance of the cached plan is poor for a particular instance of the query shape, the optimizer may select a plan with poor performance and fail to evict the cache entry. This behavior may impact deployments where two queries with the same shape have different performance characteristics (generally due to a difference in selectivity).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15225&quot; title=&quot;CachedPlanStage should execute for trial period and re-plan if query performs poorly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15225&quot;&gt;&lt;del&gt;SERVER-15225&lt;/del&gt;&lt;/a&gt; makes the query planner evaluate the cost of the cached query plan, and if the cost of this plan is too high, the query planner switches to a more efficient plan. This more efficient plan is then cached for future use.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;This ticket enables the optimization from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15225&quot; title=&quot;CachedPlanStage should execute for trial period and re-plan if query performs poorly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15225&quot;&gt;&lt;del&gt;SERVER-15225&lt;/del&gt;&lt;/a&gt; by default.&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;To disable this behavior users can set &lt;tt&gt;internalQueryCacheReplanningEnabled&lt;/tt&gt; parameter to &lt;tt&gt;false&lt;/tt&gt; using the &lt;a href=&quot;http://docs.mongodb.com/manual/reference/command/setParameter&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setParameter command&lt;/a&gt; on a running system, or at start time using the &lt;a href=&quot;http://docs.mongodb.org/manual/reference/program/mongod/#cmdoption--setParameter&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setParameter commandline option&lt;/a&gt; or &lt;a href=&quot;http://docs.mongodb.org/manual/reference/configuration-options/#setparameter-option&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setParameter in the configuration file&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;For example, to disable using setParameter:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;db.runCommand({setParameter: 1, internalQueryCacheReplanningEnabled: false})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This improvement can be re-enabled as follows:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;db.runCommand({setParameter: 1, internalQueryCacheReplanningEnabled: true})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15225&quot; title=&quot;CachedPlanStage should execute for trial period and re-plan if query performs poorly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15225&quot;&gt;&lt;del&gt;SERVER-15225&lt;/del&gt;&lt;/a&gt; for additional details.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15225&quot; title=&quot;CachedPlanStage should execute for trial period and re-plan if query performs poorly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15225&quot;&gt;&lt;del&gt;SERVER-15225&lt;/del&gt;&lt;/a&gt; introduced aggressive plan cache eviction and replanning which can solve a large class of query plan selection problems. This change was backported to the 3.0 branch, first available in 3.0.4, but is disabled by default. We should flip the default so that the plan cache eviction and replanning is available by default.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227164">SERVER-20139</key>
            <summary>Enable CachedPlanStage replanning by default in 3.0</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Aug 2015 15:17:02 +0000</created>
                <updated>Wed, 20 Sep 2017 19:18:37 +0000</updated>
                            <resolved>Wed, 26 Aug 2015 20:52:48 +0000</resolved>
                                                    <fixVersion>3.0.7</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1061401" author="dan@10gen.com" created="Thu, 15 Oct 2015 13:28:10 +0000"  >&lt;p&gt;It won&apos;t be possible to backport this fix to the 2.6 branch.&lt;/p&gt;</comment>
                            <comment id="1015417" author="xgen-internal-githook" created="Wed, 26 Aug 2015 20:50:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20139&quot; title=&quot;Enable CachedPlanStage replanning by default in 3.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20139&quot;&gt;&lt;del&gt;SERVER-20139&lt;/del&gt;&lt;/a&gt; enable CachedPlanStage replanning by default&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e4431a22883616e3296f444f71e83b13c194596&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e4431a22883616e3296f444f71e83b13c194596&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="234958">DOCS-6401</issuekey>
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            <issuekey id="157798">SERVER-15225</issuekey>
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