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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-247] Changing Shard Key Index; shard key index can be a compound index using the shard key as the prefix</title>
                <link>https://jira.mongodb.org/browse/DOCS-247</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;All versions: &lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;you need to have an index on the shard key if the collection has data.&lt;/li&gt;
	&lt;li&gt;the collection doesn&apos;t have data, then shardcollection creates the index.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For 2.2:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1506&quot; title=&quot;when sharding on a and need an index on a,b allow only a,b index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1506&quot;&gt;&lt;del&gt;SERVER-1506&lt;/del&gt;&lt;/a&gt;, if you have an a,b index then your shard key can be a.&lt;/li&gt;
	&lt;li&gt;if you have an index on a, you can create an index on a,b and then drop index on a.&lt;/li&gt;
	&lt;li&gt;at any given time you must have one index that contains the shard key as a prefix.&lt;br/&gt;
  (Can&apos;t be a multi-key index.)&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment>2.2</environment>
        <key id="42035">DOCS-247</key>
            <summary>Changing Shard Key Index; shard key index can be a compound index using the shard key as the prefix</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="matulef">Kevin Matulef</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Jun 2012 18:24:27 +0000</created>
                <updated>Mon, 30 Oct 2023 22:06:59 +0000</updated>
                            <resolved>Mon, 25 Jun 2012 21:59:10 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="136439" author="auto" created="Mon, 25 Jun 2012 21:44:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-25T14:40:14-07:00&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-247&quot; title=&quot;Changing Shard Key Index; shard key index can be a compound index using the shard key as the prefix&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-247&quot;&gt;&lt;del&gt;DOCS-247&lt;/del&gt;&lt;/a&gt;: corrections in response to technical review&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1e30060fbc37609bef0b40175514a1c1a7afb0a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1e30060fbc37609bef0b40175514a1c1a7afb0a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="136438" author="auto" created="Mon, 25 Jun 2012 21:44:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-06-22T13:13:57-07:00&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-247&quot; title=&quot;Changing Shard Key Index; shard key index can be a compound index using the shard key as the prefix&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-247&quot;&gt;&lt;del&gt;DOCS-247&lt;/del&gt;&lt;/a&gt; draft of modifiable shard key index section&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7c43217848ca2eb67534f6c120a950765195959a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7c43217848ca2eb67534f6c120a950765195959a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="135871" author="samk" created="Fri, 22 Jun 2012 20:29:08 +0000"  >&lt;p&gt;submitted the following commit for technical review.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/tychoish/mongodb-docs/commit/5e3efd4858794de444568db587bd4f7eb7d2bdd2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/tychoish/mongodb-docs/commit/5e3efd4858794de444568db587bd4f7eb7d2bdd2&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;still need to: &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;cross reference in appropriate tutorials.&lt;/li&gt;
	&lt;li&gt;consider moving section to the administration guide.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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