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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-10112] Choosing a shard key should explain how only the first field in a compound shard key is used to select the shard for the data</title>
                <link>https://jira.mongodb.org/browse/DOCS-10112</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The documentation here &lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-shard-key/#choosing-a-shard-key&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/sharding-shard-key/#choosing-a-shard-key&lt;/a&gt; doesn&apos;t mention that when using a compound shard key, only the first field in the key is used to determine on what shard the data resides.  Other fields are used to help improve cardinality, and spread data across chunks, but not across shards.&lt;/p&gt;

&lt;p&gt;Since shard keys are immutable, this turns out to be a very important fact.  &lt;/p&gt;</description>
                <environment></environment>
        <key id="373486">DOCS-10112</key>
            <summary>Choosing a shard key should explain how only the first field in a compound shard key is used to select the shard for the data</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jimreitz">James Reitz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Apr 2017 18:08:52 +0000</created>
                <updated>Mon, 30 Oct 2023 21:14:37 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>2</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940767" author="edu.bot" created="Mon, 31 Oct 2022 16:10:31 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1557413" author="jimreitz" created="Tue, 25 Apr 2017 16:28:56 +0000"  >&lt;p&gt;I&apos;m now questioning if my understanding of how shard keys work to distribute documents across shards is accurate based on a recent experience where I saw two different chunks within a sharded collection with the same value for the first field in their shard key residing on different chunks.  Regardless, it would be nice if the documentation described how range-based partitioning/sharding works.&lt;/p&gt;</comment>
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