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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>[DOCS-1629] Importance of replIndexprefetch</title>
                <link>https://jira.mongodb.org/browse/DOCS-1629</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;This is regarding the parameter replIndexprefetch in mongodb replica-set: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/program/mongod/#cmdoption-mongod--replIndexPrefetch&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/program/mongod/#cmdoption-mongod--replIndexPrefetch&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I am confused for two reasons:&lt;/p&gt;

&lt;p&gt;1) If there are extra indexes, then mongod, at some point of time, has to fetch them before applying the changes from oplog. Then what is the point of having options like &apos;none&apos; or &apos;_id_only&apos;&lt;br/&gt;
2) Are there some difference in performance related to enabling/disabling this parameters&lt;/p&gt;

&lt;p&gt;Can we have the documentation, clearly stating the use case of this parameter?&lt;/p&gt;</description>
                <environment>Linux 64bit</environment>
        <key id="79719">DOCS-1629</key>
            <summary>Importance of replIndexprefetch</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="abhishekiitg10@gmail.com">Abhishek Kumar</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Jun 2013 02:48:16 +0000</created>
                <updated>Mon, 30 Oct 2023 22:31:59 +0000</updated>
                            <resolved>Wed, 27 Jul 2016 19:04:04 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="364142" author="dan@10gen.com" created="Thu, 20 Jun 2013 13:43:33 +0000"  >&lt;p&gt;Hi Abishek, I&apos;ve moved this question to our DOCS jira project.&lt;/p&gt;</comment>
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