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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-5712] separate files for data and index</title>
                <link>https://jira.mongodb.org/browse/SERVER-5712</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Would it be feasible for mongo to be slightly more granular about its data files, and separate data from index? For example, right now, everything for the &quot;foursquare&quot; database is stored in:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;foursquare.N where N is a number&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Instead, the data and index could be separated into:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;foursquare.data.N&lt;/li&gt;
	&lt;li&gt;foursquare.index.N&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There are a couple advantages to this separation:&lt;/p&gt;

&lt;p&gt;1. We would be able to use vmtouch or other tools to pin the index into memory. Given the choice between page faults in index and page faults of data, I&apos;d much rather have the reads of data fault. The kernel is somewhat good about putting the right stuff into page cache, but at cold startup or when not all data fits in RAM it would be helpful to give it a hint about what should be warm.&lt;/p&gt;

&lt;p&gt;2. It would be easier to see how much index and how much data was cached. There exists tools to see how much of a file is in the page cache, but those aren&apos;t helpful in the current setup since we don&apos;t get an index/data breakdown.&lt;/p&gt;

&lt;p&gt;Generally, I&apos;d feel much more confident with the operations of a disk-reading mongo if we had a bit more control over what was read from disk and what was always in memory.&lt;/p&gt;

&lt;p&gt;(Even better would be to have different data/index files at the per-collection level, but I could see how that would be difficult in degenerate cases with thousands of collections.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="37214">SERVER-5712</key>
            <summary>separate files for data and index</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="nsanch">Neil Sanchala</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Apr 2012 04:52:41 +0000</created>
                <updated>Wed, 23 Jul 2014 20:46:16 +0000</updated>
                            <resolved>Thu, 26 Apr 2012 05:03:39 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="113899" author="eliot" created="Thu, 26 Apr 2012 05:03:39 +0000"  >&lt;p&gt;Not yet - but its something we want to do: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-965&quot; title=&quot;Store the indexes of a collection on another partition/drive (for example a SSD) than the documents &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-965&quot;&gt;&lt;del&gt;SERVER-965&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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