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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-1054] Ability to see block_id where object is stored</title>
                <link>https://jira.mongodb.org/browse/SERVER-1054</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In various other RDBMS products we can query to see where a given row lives on disk.  The idea is that one can monitor and effect the placement of data to be efficient when scanning many rows at once.  For example imagine a photo gallery with 100 photos where the application does a logical:&lt;/p&gt;

&lt;p&gt;select * from pictures where user_id = 10;  /   db.pictures.find(&quot;user_id&quot;:10)&lt;/p&gt;

&lt;p&gt;One would want all picture rows in the same block so that only three block fetches are required.  Two for index then one for the data payload.&lt;/p&gt;

&lt;p&gt;See this pastie for example:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://pastie.org/936239&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://pastie.org/936239&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="11843">SERVER-1054</key>
            <summary>Ability to see block_id where object is stored</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="kgorman">Kenny Gorman</reporter>
                        <labels>
                    </labels>
                <created>Mon, 26 Apr 2010 17:21:14 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:34 +0000</updated>
                            <resolved>Tue, 11 May 2010 19:14:51 +0000</resolved>
                                                    <fixVersion>1.5.2</fixVersion>
                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="14195" author="kgorman" created="Tue, 11 May 2010 19:25:32 +0000"  >&lt;p&gt;&lt;b&gt;excellent&lt;/b&gt;  Thanks!&lt;/p&gt;</comment>
                            <comment id="14194" author="redbeard0531" created="Tue, 11 May 2010 19:14:51 +0000"  >&lt;p&gt;&amp;gt;db.foo.find().showDiskLoc()&lt;br/&gt;
{ &quot;_id&quot; : 0, &quot;$diskLoc&quot; : &lt;/p&gt;
{ &quot;file&quot; : 0, &quot;offset&quot; : 39446192 }
&lt;p&gt; }&lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;$diskLoc&quot; : &lt;/p&gt;
{ &quot;file&quot; : 0, &quot;offset&quot; : 39446228 }
&lt;p&gt; }&lt;br/&gt;
{ &quot;_id&quot; : 2, &quot;$diskLoc&quot; : &lt;/p&gt;
{ &quot;file&quot; : 0, &quot;offset&quot; : 39446264 }
&lt;p&gt; }&lt;br/&gt;
...&lt;/p&gt;

&lt;p&gt;Drivers will need to be updated to add support for the $showDiskLoc query option. If you need support for a particular driver, please file a case under that jira.&lt;/p&gt;</comment>
                            <comment id="14193" author="auto" created="Tue, 11 May 2010 19:12:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;RedBeard0531&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: $showDiskLoc query option &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1054&quot; title=&quot;Ability to see block_id where object is stored&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1054&quot;&gt;&lt;del&gt;SERVER-1054&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
Implementation is a bit ugly. Please code-review and let me know if there is a better way&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/f99aba9824adf754609239274e91a9bdbd8e4cce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/f99aba9824adf754609239274e91a9bdbd8e4cce&lt;/a&gt;&lt;/p&gt;</comment>
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