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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-76905] Performance Issue about Clustered Collection : where there are more than one _id search condition, the search would fallback to COLLSCAN</title>
                <link>https://jira.mongodb.org/browse/SERVER-76905</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi there, I try to use clustered collection. But I found out when I use find method with query {_id: { $in: &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;1&amp;quot;, &amp;quot;2&amp;quot;&amp;#93;&lt;/span&gt; }}&lt;/p&gt;

&lt;p&gt;when there are more than one condition in $in array, the query performance is really bad because it fallback from CLUSTERED_IXSCAN to COLLSCAN&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/448461/448461_%E6%88%AA%E5%9C%96+2023-05-07+%E4%B8%8A%E5%8D%8810.43.41.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&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/448460/448460_%E6%88%AA%E5%9C%96+2023-05-07+%E4%B8%8A%E5%8D%8810.43.55.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2334205">SERVER-76905</key>
            <summary>Performance Issue about Clustered Collection : where there are more than one _id search condition, the search would fallback to COLLSCAN</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="-1">Unassigned</assignee>
                                    <reporter username="sj82516@gmail.com">&#20803;&#20625; &#37165;</reporter>
                        <labels>
                    </labels>
                <created>Sun, 7 May 2023 02:46:07 +0000</created>
                <updated>Thu, 11 May 2023 21:47:56 +0000</updated>
                                            <version>6.0.5</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
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                            <attachment id="448460" name="&#25130;&#22294; 2023-05-07 &#19978;&#21320;10.43.55.png" size="216686" author="sj82516@gmail.com" created="Sun, 7 May 2023 02:44:09 +0000"/>
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