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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>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-5973] Clarity Issue: Covered Queries in Sharded Clusters</title>
                <link>https://jira.mongodb.org/browse/DOCS-5973</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/limits/#limits-sharding&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Here&apos;s the doc&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In the section, &quot;Covered Queries in Sharded Clusters,&quot; it says:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;An index cannot cover a query on a sharded collection when run against a mongos if the index does not contain the shard key, with the following exception for the _id index: If a query on a sharded collection only specifies a condition on the _id field and returns only the _id field, the _id index can cover the query when run against a mongos even if the _id field is not the shard key.&lt;/p&gt;

&lt;p&gt;Changed in version 3.0: In previous versions, an index cannot cover a query on a sharded collection when run against a mongos.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;I think it could be clearer, here. I would prefer if the version information were made up front, and then the update clarified that this was no longer a limitation:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;For versions earlier than MongoDB 3.0, an index cannot cover a query on a sharded collection when run against a mongos if the index does not contain the shard key, with the following exception for the _id index: If a query on a sharded collection only specifies a condition on the _id field and returns only the _id field, the _id index can cover the query when run against a mongos even if the _id field is not the shard key.&lt;/p&gt;

&lt;p&gt;Changed in version 3.0: MongoDB can now cover a query on a sharded collection when run against a mongos.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Probably not a big deal, regardless, as it&apos;s not wrong, just a little potentially confusing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="224073">DOCS-5973</key>
            <summary>Clarity Issue: Covered Queries in Sharded Clusters</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="william.cross">William Cross</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Aug 2015 17:22:17 +0000</created>
                <updated>Thu, 26 Jul 2018 03:09:38 +0000</updated>
                            <resolved>Wed, 17 Jan 2018 04:59:49 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1776161" author="xgen-internal-githook" created="Wed, 17 Jan 2018 05:00:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5973&quot; title=&quot;Clarity Issue: Covered Queries in Sharded Clusters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5973&quot;&gt;&lt;del&gt;DOCS-5973&lt;/del&gt;&lt;/a&gt;: move the changed in version 3.0 label&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/50824a2cdb6fbcf2251ba2b123d813e8d25bc4f8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/50824a2cdb6fbcf2251ba2b123d813e8d25bc4f8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1776160" author="kay.kim@10gen.com" created="Wed, 17 Jan 2018 04:59:49 +0000"  >&lt;p&gt;The suggested text is not quite correct in the actual limitation, so I just removed the &quot;Changed in version 3.0&quot; from the second paragraph and prefixed the first paragraph with Starting in MongoDB 3.0, ...&lt;/p&gt;
</comment>
                            <comment id="1776159" author="xgen-internal-githook" created="Wed, 17 Jan 2018 04:58:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5973&quot; title=&quot;Clarity Issue: Covered Queries in Sharded Clusters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5973&quot;&gt;&lt;del&gt;DOCS-5973&lt;/del&gt;&lt;/a&gt;: move the changed in version 3.0 label&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c1d47c9f8421413c2b23acf99d635c3c5fc198e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c1d47c9f8421413c2b23acf99d635c3c5fc198e6&lt;/a&gt;&lt;/p&gt;</comment>
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