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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6096] unique indexes and sharding.</title>
                <link>https://jira.mongodb.org/browse/SERVER-6096</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This maybe a question more than a bug.  When I create a new collection, then try and set the Indexes, it returns an error because I set the IndexOption to unique and fails to create the index.  I don&apos;t have the exact error message, but it says something about can&apos;t use unique indexed on a server with shards.&lt;/p&gt;</description>
                <environment>Debian Squeeze</environment>
        <key id="41287">SERVER-6096</key>
            <summary>unique indexes and sharding.</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dbailey62">Donny Bailey</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Jun 2012 21:08:23 +0000</created>
                <updated>Wed, 23 Oct 2013 11:46:14 +0000</updated>
                            <resolved>Fri, 15 Jun 2012 13:30:31 +0000</resolved>
                                    <version>2.0.1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="133262" author="scotthernandez" created="Fri, 15 Jun 2012 13:30:31 +0000"  >&lt;p&gt;You have run into a design contraint with sharding where the shard key must be included (as the prefix) of any unique index as described here: &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Sharding+Limits#ShardingLimits-UniqueIndexesDOCS%3AIndexes%23UniqueIndexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Sharding+Limits#ShardingLimits-UniqueIndexesDOCS%3AIndexes%23UniqueIndexes&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;If you can post the shard key, what unique index you tried to create and the error message we can see if there could be another cause, and then reopen the issue, or re-categorize it.&lt;/p&gt;</comment>
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