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    <title>MongoDB Jira</title>
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    <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-15997] [Server] Improve documentation of &quot;planCacheSize&quot; server parameter</title>
                <link>https://jira.mongodb.org/browse/DOCS-15997</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/parameters/#mongodb-parameter-param.planCacheSize&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation for the &lt;tt&gt;planCacheSize&lt;/tt&gt; parameter&lt;/a&gt; could be improved in a few ways.&lt;/p&gt;

&lt;p&gt;First, it may be worth clarifying that this parameter only affects the plan cache for the slot-based execution (SBE) engine. There is a separate plan cache for the classic execution engine which does not obey this parameter. As we ship more and more features in (SBE), we expect that the SBE plan cache will become the primary plan cache.&lt;/p&gt;

&lt;p&gt;Second but perhaps more important, the docs state that this was new in version 5.1. That&apos;s stale and presumably the result of the fact that we originally planned to ship SBE and the SBE plan cache in an earlier version but ultimately chose to delay the release. We ended up shipping SBE for some limited $group/$lookup scenarios in 6.0 and did &lt;em&gt;not&lt;/em&gt; release the SBE plan cache. In 6.2 we shipped some additional $lookup nested loop join plans in SBE. In 6.3, we did a much more broad release of SBE for find commands and also enabled the SBE plan cache. In 7.0, we plan to release a bit more so that I would expect most &lt;tt&gt;find&lt;/tt&gt; commands to execute using SBE in 7.0.&lt;/p&gt;

&lt;p&gt;The implications for the docs are that the SBE plan cache was first enabled in 6.3. Since the &lt;tt&gt;planCacheSize&lt;/tt&gt; parameter is tied specifically to the SBE plan cache as explained above, this means that the &lt;tt&gt;planCacheSize&lt;/tt&gt; parameter should be documented as new in 6.3 rather than new in 5.1.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2303544">DOCS-15997</key>
            <summary>[Server] Improve documentation of &quot;planCacheSize&quot; server parameter</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="13201">Fixed</resolution>
                                        <assignee username="alison.huh@mongodb.com">Alison Huh</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Mar 2023 15:24:30 +0000</created>
                <updated>Mon, 13 Nov 2023 17:25:42 +0000</updated>
                            <resolved>Tue, 6 Jun 2023 17:21:39 +0000</resolved>
                                                    <fixVersion>6.3.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5321116" author="david.storch" created="Mon, 3 Apr 2023 20:25:38 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sarah.olson%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sarah.olson@mongodb.com&quot;&gt;sarah.olson@mongodb.com&lt;/a&gt; sounds good to me!&lt;/p&gt;</comment>
                            <comment id="5320614" author="JIRAUSER1264463" created="Mon, 3 Apr 2023 18:43:02 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;david.storch@mongodb.com&quot;&gt;david.storch@mongodb.com&lt;/a&gt;. I&apos;m going to add this ticket to the work needed for 6.3. I&apos;m also going to increase the priority a bit, based on wanting to clean up the inaccurate information. Please let me know if you disagree with this approach.&#160;&lt;/p&gt;</comment>
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