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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-2023] touch command to pre-heat a collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-2023</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>{ touch : &quot;foo&quot; , indexes : &amp;lt;bool, defaults to true&amp;gt; }

&lt;p&gt;does not look at records.&lt;/p&gt;

&lt;p&gt;goes to each extent in data and index, and reads 1 byte per page&lt;/p&gt;

&lt;p&gt;want to lock as little as possible&lt;/p&gt;

&lt;p&gt;in read lock should get list of extents and sizes, and then unlock.&lt;br/&gt;
just needs to check db wasn&apos;t deleted in between each one. &lt;/p&gt;</description>
                <environment></environment>
        <key id="13542">SERVER-2023</key>
            <summary>touch command to pre-heat a collection</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="9">Done</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Oct 2010 17:56:34 +0000</created>
                <updated>Wed, 15 Aug 2012 14:16:13 +0000</updated>
                            <resolved>Fri, 18 May 2012 15:04:26 +0000</resolved>
                                                    <fixVersion>2.1.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="144626" author="auto" created="Wed, 18 Jul 2012 19:12:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-13T09:44:06-07:00&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/SERVER-2023&quot; title=&quot;touch command to pre-heat a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2023&quot;&gt;&lt;del&gt;SERVER-2023&lt;/del&gt;&lt;/a&gt; touch command documentation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e581a8e5ff46127645a07ff0286d574a575ddc21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e581a8e5ff46127645a07ff0286d574a575ddc21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="120642" author="auto" created="Thu, 17 May 2012 17:45:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2023&quot; title=&quot;touch command to pre-heat a collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2023&quot;&gt;&lt;del&gt;SERVER-2023&lt;/del&gt;&lt;/a&gt; new command &quot;touch&quot; - pretouches a collection, possibly with indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bc6a90645eb0153ff6d46b63d1368dc87d0bf331&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bc6a90645eb0153ff6d46b63d1368dc87d0bf331&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="76683" author="aaron" created="Thu, 29 Dec 2011 22:26:29 +0000"  >&lt;p&gt;Re &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4583&quot; title=&quot;Would like to have a command for priming index by a sequential read of the index data instead of a B-tree traverse.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4583&quot;&gt;&lt;del&gt;SERVER-4583&lt;/del&gt;&lt;/a&gt;, user wants to make sure that the index extents are pre heated efficiently, without scanning through the btree buckets as a tree data structure.&lt;/p&gt;</comment>
                            <comment id="20101" author="eliot" created="Mon, 8 Nov 2010 04:39:07 +0000"  >&lt;p&gt;&lt;a href=&quot;http://linux.die.net/man/2/readahead&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://linux.die.net/man/2/readahead&lt;/a&gt;&lt;/p&gt;</comment>
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