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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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            <title>[DOCS-16027] [Server] Elaborate on $set tracking changed fields on update</title>
                <link>https://jira.mongodb.org/browse/DOCS-16027</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;I believe that our documentation on &lt;tt&gt;$set&lt;/tt&gt; should include a section which explains how it doesn&apos;t change the fields that don&apos;t change in the update, so only ones that changed get written to the oplog. This is a major selling point for using &lt;tt&gt;$set&lt;/tt&gt; and, in my point of view, not obvious that it works like that.&lt;/p&gt;

&lt;p&gt;Advantages over full document replacement:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Computes the delta of the existing document and fields in $set&lt;/li&gt;
	&lt;li&gt;Only changes are written to the oplog&lt;/li&gt;
	&lt;li&gt;Smaller memory footprint&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This saves a lot of work for the client intersecting documents to figure out which fields have been changed before sending an update.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2311338">DOCS-16027</key>
            <summary>[Server] Elaborate on $set tracking changed fields on update</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="ilan.cohen@mongodb.com">Ilan Cohen</reporter>
                        <labels>
                            <label>backlog</label>
                            <label>proactive</label>
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                <created>Tue, 11 Apr 2023 08:15:30 +0000</created>
                <updated>Mon, 22 Jan 2024 15:53:39 +0000</updated>
                                                                            <component>manual</component>
                    <component>Server</component>
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                            <votes>1</votes>
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