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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>[SERVER-2580] ensureIndex with unique:true and dropDups:true fails if duplicate data present</title>
                <link>https://jira.mongodb.org/browse/SERVER-2580</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Problem:&lt;/p&gt;

&lt;p&gt;From the documentation&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Indexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Indexes&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;A unique index cannot be created on a key that has duplicate values. If you would like to create the index anyway, keeping the first document the database indexes and deleting all subsequent documents that have duplicate values, add the dropDups option.&lt;/p&gt;

&lt;p&gt;db.things.ensureIndex(&lt;/p&gt;
{firstname : 1}
&lt;p&gt;, &lt;/p&gt;
{unique : true, dropDups : true}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;However, this appears to be broken, since its errors out with&lt;/p&gt;

&lt;p&gt;E11000 duplicate key error index: test.fb.$name_1  dup key: { : &quot;fred&quot; }&lt;/p&gt;

&lt;p&gt;Reproduce:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.fb.save(&lt;/p&gt;
{name:&quot;fred&quot;}
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.fb.save(&lt;/p&gt;
{name:&quot;fred&quot;}
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.fb.save(&lt;/p&gt;
{name:&quot;fred&quot;}
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.fb.ensureIndex(&lt;/p&gt;
{name:1}
&lt;p&gt;, &lt;/p&gt;
{unique:1, dropDupes:1}
&lt;p&gt;);      &lt;br/&gt;
E11000 duplicate key error index: test.fb.$name_1  dup key: { : &quot;fred&quot; }&lt;br/&gt;
&amp;gt; db.fb.ensureIndex(&lt;/p&gt;
{name:1}
&lt;p&gt;, &lt;/p&gt;
{unique:true, dropDupes:true}
&lt;p&gt;);&lt;br/&gt;
E11000 duplicate key error index: test.fb.$name_1  dup key: { : &quot;fred&quot; }&lt;/p&gt;

&lt;p&gt;Business case:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;broken functionality&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment>1.6.5 and 1.7.6</environment>
        <key id="14788">SERVER-2580</key>
            <summary>ensureIndex with unique:true and dropDups:true fails if duplicate data present</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="alvin">Alvin Richards</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Feb 2011 20:05:31 +0000</created>
                <updated>Wed, 2 Mar 2011 05:34:45 +0000</updated>
                            <resolved>Wed, 2 Mar 2011 05:34:45 +0000</resolved>
                                    <version>1.6.5</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="24158" author="alvin" created="Thu, 17 Feb 2011 20:30:09 +0000"  >&lt;p&gt;Duplicate issue of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2054&quot; title=&quot;Creating an index with dropDups shouldn&amp;#39;t assert&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2054&quot;&gt;&lt;del&gt;SERVER-2054&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="24153" author="eliot" created="Thu, 17 Feb 2011 20:16:23 +0000"  >&lt;p&gt;You&apos;re probably just seeing: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2054&quot; title=&quot;Creating an index with dropDups shouldn&amp;#39;t assert&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2054&quot;&gt;&lt;del&gt;SERVER-2054&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="24152" author="eliot" created="Thu, 17 Feb 2011 20:15:44 +0000"  >&lt;p&gt;Was the index created successfully?&lt;br/&gt;
You can check with &lt;br/&gt;
db.fb.getIndexes()&lt;/p&gt;</comment>
                            <comment id="24149" author="alvin" created="Thu, 17 Feb 2011 20:12:45 +0000"  >&lt;p&gt;Sorry, cut &amp;amp; pasted the wrong example&lt;/p&gt;

&lt;p&gt;&amp;gt; db.fb.ensureIndex(&lt;/p&gt;
{name:1}
&lt;p&gt;, &lt;/p&gt;
{unique:1, dropDups:1}
&lt;p&gt;);&lt;br/&gt;
E11000 duplicate key error index: test.fb.$name_1  dup key: { : &quot;fred&quot; }&lt;br/&gt;
&amp;gt; &lt;/p&gt;

&lt;p&gt;&amp;gt; db.fb.ensureIndex(&lt;/p&gt;
{name:1}
&lt;p&gt;, &lt;/p&gt;
{unique:true, dropDups:true}
&lt;p&gt;);&lt;br/&gt;
E11000 duplicate key error index: test.fb.$name_1  dup key: { : &quot;fred&quot; }&lt;br/&gt;
&amp;gt; &lt;/p&gt;</comment>
                            <comment id="24146" author="eliot" created="Thu, 17 Feb 2011 20:08:05 +0000"  >&lt;p&gt;Type, dropDups vs dropDupes&lt;br/&gt;
Documentation is correct.&lt;/p&gt;</comment>
                    </comments>
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