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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-10093] Comment on: &quot;manual/core/index-sparse.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-10093</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;For mongodb v2.6&lt;/p&gt;

&lt;p&gt;The example at the end of this page seems wrong.&lt;/p&gt;

&lt;p&gt;However, this index would not permit adding the following documents:&lt;/p&gt;

&lt;p&gt;db.scores.insert( &lt;/p&gt;
{ &quot;userid&quot;: &quot;PWWfO8lFs1&quot;, &quot;score&quot;: 82 }
&lt;p&gt; )&lt;br/&gt;
db.scores.insert( &lt;/p&gt;
{ &quot;userid&quot;: &quot;XlSOX66gEy&quot;, &quot;score&quot;: 90 }
&lt;p&gt; )&lt;/p&gt;

&lt;p&gt;It has different score values but it states that due to sparse index on score field these statements would not execute fine.&lt;/p&gt;</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;https://docs.mongodb.com/v2.4/core/index-sparse/#index-type-sparse&quot;&gt;https://docs.mongodb.com/v2.4/core/index-sparse/#index-type-sparse&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36&lt;br/&gt;
*Screen Resolution*: 1366 x 768&lt;br/&gt;
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        <key id="371874">DOCS-10093</key>
            <summary>Comment on: &quot;manual/core/index-sparse.txt&quot;</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="13202">Works as Designed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="xgen-internal-docs">Docs Collector User</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Fri, 7 Apr 2017 09:19:01 +0000</created>
                <updated>Fri, 27 Oct 2023 13:19:28 +0000</updated>
                            <resolved>Tue, 11 Apr 2017 12:54:35 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1545821" author="kay.kim@10gen.com" created="Tue, 11 Apr 2017 12:54:35 +0000"  >&lt;p&gt;The example refers to the collection that has:&lt;/p&gt;

{ &quot;_id&quot; : ObjectId(&quot;523b6e32fb408eea0eec2647&quot;), &quot;userid&quot; : &quot;newbie&quot; }
{ &quot;_id&quot; : ObjectId(&quot;523b6e61fb408eea0eec2648&quot;), &quot;userid&quot; : &quot;abby&quot;, &quot;score&quot; : 82 }
{ &quot;_id&quot; : ObjectId(&quot;523b6e6ffb408eea0eec2649&quot;), &quot;userid&quot; : &quot;nina&quot;, &quot;score&quot; : 90 }

&lt;p&gt;As such, with the unique,sparse index, you cannot add new documents that contain the score 82 or 90:&lt;br/&gt;
db.scores.insert( &lt;/p&gt;
{ &quot;userid&quot;: &quot;AAAAAAA&quot;, &quot;score&quot;: 82 }
&lt;p&gt; )&lt;br/&gt;
db.scores.insert( &lt;/p&gt;
{ &quot;userid&quot;: &quot;BBBBBBB&quot;, &quot;score&quot;: 90 }
&lt;p&gt; )&lt;/p&gt;</comment>
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