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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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            <title>[SERVER-14569] RecordStore as clustered index</title>
                <link>https://jira.mongodb.org/browse/SERVER-14569</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;RecordStore in pluggable engine API is a mapping from DiskLoc to a BSON document. It might be better to make it a mapping from primary key to document. That way, queries that use primary key index will only need to do one read instead of two.&lt;/p&gt;</description>
                <environment></environment>
        <key id="147318">SERVER-14569</key>
            <summary>RecordStore as clustered index</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="igor">Igor Canadi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Jul 2014 19:32:51 +0000</created>
                <updated>Tue, 6 Dec 2022 05:03:56 +0000</updated>
                            <resolved>Wed, 8 Jun 2022 09:10:01 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>5</votes>
                                    <watches>20</watches>
                                                                                                                <comments>
                            <comment id="4601478" author="louis.williams" created="Wed, 8 Jun 2022 09:10:01 +0000"  >&lt;p&gt;This was released as a feature in MongoDB 5.3. See &lt;a href=&quot;https://www.mongodb.com/docs/upcoming/core/clustered-collections/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Clustered Collections&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2606716" author="milkie" created="Fri, 13 Dec 2019 14:50:49 +0000"  >&lt;p&gt;That&apos;s correct.  We&apos;re hoping it could be a big win for some write heavy workloads, but for ones with large _id key sizes the tradeoff is that all secondary indexes might start consuming a lot more space.&lt;/p&gt;</comment>
                            <comment id="2606681" author="mdcallag@gmail.com" created="Fri, 13 Dec 2019 14:46:21 +0000"  >&lt;p&gt;I assume that fixing this will also make it possible for queries with _id:1 to be index-only (covering). I assume that fixing this will be a big win for performance for write-heavy queries given the maintenance cost of the extra index today.&#160;My experience with it from years ago is at&#160;&lt;a href=&quot;http://smalldatum.blogspot.com/2015/07/linkbench-for-mysql-mongodb-with-cached.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://smalldatum.blogspot.com/2015/07/linkbench-for-mysql-mongodb-with-cached.html&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2062058" author="geert.bosch" created="Wed, 14 Nov 2018 18:20:03 +0000"  >&lt;p&gt;See also this discussion:&#160;&lt;a href=&quot;https://groups.google.com/forum/#!topic/mongodb-dev/8dhOvNx9mBY&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!topic/mongodb-dev/8dhOvNx9mBY&lt;/a&gt;&lt;/p&gt;</comment>
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