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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-10264] Clarify what occurs when one key is removed from a Compound Index</title>
                <link>https://jira.mongodb.org/browse/DOCS-10264</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;If you have a collection that has both a compound index and an index on its prefix (e.g. &lt;/p&gt;
{ a: 1, b: 1 }
&lt;p&gt; and &lt;/p&gt;
{ a: 1 }
&lt;p&gt;), if neither index has a sparse or unique constraint, then you can remove the index on the prefix (e.g. &lt;/p&gt;
{ a: 1 }
&lt;p&gt;). MongoDB will use the compound index in all of the situations that it would have used the prefix index.&lt;/p&gt;

&lt;p&gt; if neither &quot;prefix index&quot; has a sparse or unique constraint ? is a valid statement.&lt;br/&gt;
Because if the Compound index has unique constraint does it matters ? still mongodb is not using &quot;prefix index&quot;&lt;/p&gt;

&lt;p&gt;From &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10305&quot; title=&quot;Clarify what occurs when one key is removed from a Compound Index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10305&quot;&gt;&lt;del&gt;DOCS-10305&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;what if i have unique index on &lt;tt&gt;{a,b}&lt;/tt&gt; but not on &lt;tt&gt;{a}}} and I removed {{{a}&lt;/tt&gt; how will it effect ? &lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;why it&apos;s document neither of them should have unique index ?&lt;/p&gt;&lt;/blockquote&gt;
</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;https://docs.mongodb.com/manual/core/index-compound/&quot;&gt;https://docs.mongodb.com/manual/core/index-compound/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36&lt;br/&gt;
*Referrer*: &lt;a href=&quot;https://docs.mongodb.com/manual/core/index-partial/&quot;&gt;https://docs.mongodb.com/manual/core/index-partial/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1366 x 768&lt;br/&gt;
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        <key id="384059">DOCS-10264</key>
            <summary>Clarify what occurs when one key is removed from a Compound Index</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="xgen-internal-docs">Docs Collector User</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                            <label>docs-triage</label>
                    </labels>
                <created>Tue, 16 May 2017 18:38:36 +0000</created>
                <updated>Mon, 30 Oct 2023 21:12:16 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4940740" author="edu.bot" created="Mon, 31 Oct 2022 16:10:11 +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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