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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-27622] Skip document read from disk when delete with IdHack plan</title>
                <link>https://jira.mongodb.org/browse/SERVER-27622</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When delete one record with _id, IdHack stage will read not only the recordId, and the whole record store. Maybe the latter is not necessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="343998">SERVER-27622</key>
            <summary>Skip document read from disk when delete with IdHack plan</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="3">Duplicate</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="hustchensi">chensi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Jan 2017 11:48:06 +0000</created>
                <updated>Tue, 7 Feb 2017 20:07:02 +0000</updated>
                            <resolved>Tue, 7 Feb 2017 19:52:35 +0000</resolved>
                                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1494227" author="david.storch" created="Tue, 7 Feb 2017 19:52:25 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=hustchensi&quot; class=&quot;user-hover&quot; rel=&quot;hustchensi&quot;&gt;hustchensi&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;In general, when a document is deleted, it is necessary to read the entire document out of the collection. This is needed to determine which index keys should be deleted, in order to keep all secondary indexes in sync.&lt;/p&gt;

&lt;p&gt;However, you are correct that the system is fetching the document twice right now for IDHACK deletes. It does so once in the IDHACK stage:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.2/src/mongo/db/exec/idhack.cpp#L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.2/src/mongo/db/exec/idhack.cpp#L153&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;And again for unindexing:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.2/src/mongo/db/catalog/collection.cpp#L580&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.5.2/src/mongo/db/catalog/collection.cpp#L580&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17148&quot; title=&quot;Remove plans do not need a FETCH stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17148&quot;&gt;SERVER-17148&lt;/a&gt; already tracks the work to get rid of one of these fetches during the execution of delete commands. I&apos;m going to make a note that this also applies to IDHACK deletes. Resolving as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17148&quot; title=&quot;Remove plans do not need a FETCH stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17148&quot;&gt;SERVER-17148&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Dave&lt;/p&gt;</comment>
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