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    <title>MongoDB Jira</title>
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    <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>[DOCS-8699] Composite _id field gotchas</title>
                <link>https://jira.mongodb.org/browse/DOCS-8699</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;I&apos;m trying to find out where there is a discussion about using a document for an _id value.&lt;/p&gt;

&lt;p&gt;Specifically, one that lists the gotchas of exact matches requiring equivalent field order, and when the default _id index is and is not used (&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ { _id: { a: 1, b: 2 } }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt; vs. &lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &quot;_id.a&quot;: 1, &quot;_id.b&quot;: 2 }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;).&lt;/p&gt;

&lt;p&gt;We just solved a production performance issue by adding an index on effectively &quot;_id.a&quot; and so I&apos;m trying to find a nice link to add to our required-knowledge list that spells that out.  So far the best I have found is:&lt;br/&gt;
&lt;a href=&quot;http://stackoverflow.com/questions/23164417/mongodb-and-composite-primary-keys#answer-23317292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/23164417/mongodb-and-composite-primary-keys#answer-23317292&lt;/a&gt;&lt;br/&gt;
But it doesn&apos;t list the reasons why, just the facts.&lt;/p&gt;</description>
                <environment></environment>
        <key id="312638">DOCS-8699</key>
            <summary>Composite _id field gotchas</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="ravind.kumar">Ravind Kumar</assignee>
                                    <reporter username="chrisf@findly.com">Chris Findlay</reporter>
                        <labels>
                    </labels>
                <created>Tue, 30 Aug 2016 01:56:01 +0000</created>
                <updated>Mon, 30 Oct 2023 21:28:36 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4940968" author="edu.bot" created="Mon, 31 Oct 2022 16:13:20 +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>
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