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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DRIVERS-1492] Clustered indexes for Time-series collections</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-1492</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    There may be downstream impacts for this project. We will update with potential impacts after we move to design. &lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
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&lt;p&gt;Make the RecordStore for a collection a mapping from _id key to BSON document, instead of a mapping from RecordId to BSON document.  This will then allow us to remove the separate _id index.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Queries that currently use the _id index will only need to do one read instead of two.&lt;/li&gt;
	&lt;li&gt;Inserts and deletes also have one less index to update.&lt;/li&gt;
	&lt;li&gt;Range queries on _id will be able to use a collection scan rather than index scan with fetch stage. This allows for far more efficient sequential storage access where random order access is required now.&lt;/li&gt;
	&lt;li&gt;Range removes on _id allow for efficient truncations that avoid reading data to be removed if there are no other indexes.&lt;/li&gt;
	&lt;li&gt;Significantly speed up chunk migrations on sharded clusters.&lt;/li&gt;
	&lt;li&gt;Improve usability of MongoDB for timeseries data.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Doing a smaller internal-only project first, that leaves full support for sharded collections with shard keys other than _id as future work, helps evaluating performance gains before committing to implementing the more expensive future work, and allows answering design questions for that work.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
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                <environment></environment>
        <key id="1584455">DRIVERS-1492</key>
            <summary>Clustered indexes for Time-series collections</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>init-53-m1.0</label>
                    </labels>
                <created>Fri, 8 Jan 2021 16:55:46 +0000</created>
                <updated>Wed, 15 Feb 2023 23:10:50 +0000</updated>
                            <resolved>Tue, 16 Feb 2021 17:20:18 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3617492" author="esha.bhargava" created="Tue, 16 Feb 2021 17:20:18 +0000"  >&lt;p&gt;No driver changes needed.&lt;/p&gt;</comment>
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            <issuekey id="1613194">CSHARP-3401</issuekey>
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