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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-10564] cache plans.  retrieve them, retire them, debug them.</title>
                <link>https://jira.mongodb.org/browse/SERVER-10564</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="86467">SERVER-10564</key>
            <summary>cache plans.  retrieve them, retire them, debug them.</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="hari.khalsa@10gen.com">hari.khalsa@10gen.com</assignee>
                                    <reporter username="hari.khalsa@10gen.com">hari.khalsa@10gen.com</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Aug 2013 12:52:59 +0000</created>
                <updated>Thu, 2 Aug 2018 21:21:11 +0000</updated>
                            <resolved>Thu, 16 Jan 2014 15:25:35 +0000</resolved>
                                                    <fixVersion>2.5.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="478105" author="xgen-internal-githook" created="Tue, 7 Jan 2014 02:45:07 +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-10564&quot; title=&quot;cache plans.  retrieve them, retire them, debug them.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10564&quot;&gt;&lt;del&gt;SERVER-10564&lt;/del&gt;&lt;/a&gt; enable the plan cache&lt;/p&gt;

&lt;p&gt;Signed-off-by: Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/38a8592abd02960a56f0b167d3a2366e130a8e9d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/38a8592abd02960a56f0b167d3a2366e130a8e9d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="477049" author="xgen-internal-githook" created="Fri, 3 Jan 2014 21:59:15 +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-10564&quot; title=&quot;cache plans.  retrieve them, retire them, debug them.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10564&quot;&gt;&lt;del&gt;SERVER-10564&lt;/del&gt;&lt;/a&gt; cache collection scan query plans&lt;/p&gt;

&lt;p&gt;Signed-off-by: Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c321c9c0b668c8006e3a43971cbf6e0e37778efb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c321c9c0b668c8006e3a43971cbf6e0e37778efb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="476165" author="xgen-internal-githook" created="Tue, 31 Dec 2013 20:21:16 +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-10564&quot; title=&quot;cache plans.  retrieve them, retire them, debug them.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10564&quot;&gt;&lt;del&gt;SERVER-10564&lt;/del&gt;&lt;/a&gt; plan cache data storage mechanism&lt;/p&gt;

&lt;p&gt;The plan cache now builds a tree isomorphic to the tagged match&lt;br/&gt;
expression in order to store the index tags used by a plan. On&lt;br/&gt;
cache hit, this tree is used to tag the match expression. The tagged&lt;br/&gt;
tree can then be fed through the access planner in order to recreate&lt;br/&gt;
the original query solution.&lt;/p&gt;

&lt;p&gt;Signed-off-by: Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/271ecb700eaad773baa052cddfb426b19f5598f5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/271ecb700eaad773baa052cddfb426b19f5598f5&lt;/a&gt;&lt;/p&gt;</comment>
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