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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-417] Add doc for option to disable index prefetching</title>
                <link>https://jira.mongodb.org/browse/DOCS-417</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Config option for indexPrefetch commandline flag:&lt;/p&gt;

&lt;p&gt;Command line flag --replIndexPrefetch&lt;br/&gt;
Parameter replIndexPrefetch&lt;br/&gt;
values: none, _id_only, all&lt;br/&gt;
&quot;all&quot; is the default if unspecified.&lt;/p&gt;

&lt;p&gt;&amp;#8212;&lt;br/&gt;
New parameter replIndexPrefetch.&lt;br/&gt;
Settable via the command line or use setParameter() command on a running server.&lt;br/&gt;
Only valid on a server started with --replSet parameter.&lt;br/&gt;
This allows a user to disable the prefetching of all index pages prior to the application&lt;br/&gt;
of a replicated op on a secondary.&lt;br/&gt;
For most use cases, prefetching all indexes for a given op will provide good performance.&lt;br/&gt;
For use cases that do many in-place updates to documents in a collection with many indexes&lt;br/&gt;
that are unaffected by such updates, using the &apos;_id_only&apos; setting may provide better performance&lt;br/&gt;
than the &apos;all&apos; setting. The &apos;_id_only&apos; setting only prefetches index pages for the _id index,&lt;br/&gt;
which will always be used to find the document needed to be updated.&lt;br/&gt;
The &apos;none&apos; setting will be used for debugging only; there should be no production use cases for&lt;br/&gt;
this setting.&lt;br/&gt;
getParameter() supports getting the current value of this parameter.&lt;/p&gt;</description>
                <environment></environment>
        <key id="47484">DOCS-417</key>
            <summary>Add doc for option to disable index prefetching</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="andrew.leung@10gen.com">Andrew Leung</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Aug 2012 19:54:31 +0000</created>
                <updated>Mon, 13 Nov 2023 18:39:41 +0000</updated>
                            <resolved>Tue, 28 Aug 2012 15:49:34 +0000</resolved>
                                                    <fixVersion>mongodb-2.2</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="157563" author="auto" created="Tue, 28 Aug 2012 16:06:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-28T09:05:52-07:00&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-417&quot; title=&quot;Add doc for option to disable index prefetching&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-417&quot;&gt;&lt;del&gt;DOCS-417&lt;/del&gt;&lt;/a&gt; corrections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1dc73cb407530b9fc5ad1355b11fe0188b2a21cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1dc73cb407530b9fc5ad1355b11fe0188b2a21cf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="157549" author="auto" created="Tue, 28 Aug 2012 15:49:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-28T08:34:34-07:00&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-417&quot; title=&quot;Add doc for option to disable index prefetching&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-417&quot;&gt;&lt;del&gt;DOCS-417&lt;/del&gt;&lt;/a&gt;: added documentation of --replIndexPrefetch&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7bec88850a54170ab4b1c4e5c3b39129f1c2abdc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7bec88850a54170ab4b1c4e5c3b39129f1c2abdc&lt;/a&gt;&lt;/p&gt;</comment>
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