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    <title>MongoDB Jira</title>
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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-78113] not cache meaningless plan, it will increased memory overhead and increase computing overhead.</title>
                <link>https://jira.mongodb.org/browse/SERVER-78113</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&#160;when the mode is PlanCachingMode::AlwaysCache or PlanCachingMode::SometimesCache, there is a special case.&lt;br/&gt;
&#160;take Classic plan cache for example:&lt;br/&gt;
&#160; &#160;If the winning index&apos;s advanced = 0 &amp;amp;&amp;amp; works == 1 &amp;amp;&amp;amp; isEOF == true, which means we didn&apos;t get any data to rank score, all candidates&#160;&lt;br/&gt;
&#160; &#160;score is same. the score of the calculation is meaningless.&lt;/p&gt;

&lt;p&gt;In this case, if we cache the plan, it will increased memory overhead. when the cached plan stage pick best plan, it will trigger replan. this will increase computing overhead.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2368792">SERVER-78113</key>
            <summary>not cache meaningless plan, it will increased memory overhead and increase computing overhead.</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="1147952115@qq.com">y yz</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Thu, 15 Jun 2023 06:26:55 +0000</created>
                <updated>Fri, 13 Oct 2023 07:15:48 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5775625" author="1147952115@qq.com" created="Fri, 13 Oct 2023 07:15:48 +0000"  >&lt;p&gt;Do we have the conclusion of this question? If so, we can synchronize it. Thank you.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;thanks.&lt;/p&gt;</comment>
                            <comment id="5500695" author="1147952115@qq.com" created="Thu, 15 Jun 2023 06:53:19 +0000"  >&lt;p&gt;the code address:&#160; &lt;a href=&quot;https://github.com/mongodb/mongo/pull/1555&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/pull/1555&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5500693" author="1147952115@qq.com" created="Thu, 15 Jun 2023 06:52:22 +0000"  >&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/456447/456447_image-2023-06-15-14-51-29-750.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/456448/456448_image-2023-06-15-14-52-20-383.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="5500677" author="1147952115@qq.com" created="Thu, 15 Jun 2023 06:28:19 +0000"  >&lt;p&gt;if the winning index&apos;s advanced = 0 &amp;amp;&amp;amp; works == 1 &amp;amp;&amp;amp; isEOF == true, which means we didn&apos;t get any data to rank score, all candidates score is same. the score of the calculation is meaningless.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;In this case, if we cache the plan, it will increased memory overhead. when the cached plan stage pick best plan, it will trigger replan. this will increase computing overhead.&lt;/p&gt;</comment>
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