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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-4922] From 2.6 after a collection has been sharded the index of a shard key can be a multi-key index</title>
                <link>https://jira.mongodb.org/browse/DOCS-4922</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/docs/blob/master/source/core/index-multikey.txt#L67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/blob/master/source/core/index-multikey.txt#L67&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="187695">DOCS-4922</key>
            <summary>From 2.6 after a collection has been sharded the index of a shard key can be a multi-key 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="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="gianfranco">Gianfranco Palumbo</reporter>
                        <labels>
                            <label>sharding</label>
                    </labels>
                <created>Thu, 5 Mar 2015 18:19:55 +0000</created>
                <updated>Wed, 27 Jul 2016 20:00:05 +0000</updated>
                            <resolved>Wed, 17 Jun 2015 15:51:51 +0000</resolved>
                                                    <fixVersion>mongodb-2.6</fixVersion>
                    <fixVersion>mongodb-3.0</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="943053" author="xgen-internal-githook" created="Wed, 17 Jun 2015 15:50:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4922&quot; title=&quot;From 2.6 after a collection has been sharded the index of a shard key can be a multi-key index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4922&quot;&gt;&lt;del&gt;DOCS-4922&lt;/del&gt;&lt;/a&gt; shard key and multikey index&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d024680606e394e6deea007dc7d1ac4f7c2aae84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d024680606e394e6deea007dc7d1ac4f7c2aae84&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="943051" author="xgen-internal-githook" created="Wed, 17 Jun 2015 15:49:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4922&quot; title=&quot;From 2.6 after a collection has been sharded the index of a shard key can be a multi-key index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4922&quot;&gt;&lt;del&gt;DOCS-4922&lt;/del&gt;&lt;/a&gt; shard key and multikey index&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a6d5580484458ebc06d0d21f894bb3705f793208&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a6d5580484458ebc06d0d21f894bb3705f793208&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="844002" author="gianfranco" created="Thu, 5 Mar 2015 18:25:42 +0000"  >&lt;p&gt;A sharded collection can now have multikey indexes after it has been sharded. However, this is not encouraged as queries that use the multikey indexes will always be slower than normal indexes. Therefore, it is highly recommended to have a dedicated index for the shard key that is not a multikey type if the user wants to use a multikey index on another field.&lt;/p&gt;</comment>
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