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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2699] ensureIndex() fails to create unique index if non-unique index already exists</title>
                <link>https://jira.mongodb.org/browse/SERVER-2699</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;db.foo.ensureIndex(&lt;/p&gt;
{a : 1}
&lt;p&gt;);&lt;br/&gt;
db.foo.save(&lt;/p&gt;
{key:1, a:1}
&lt;p&gt;);&lt;br/&gt;
db.foo.save(&lt;/p&gt;
{key:2, a:2}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;db.foo.ensureIndex(&lt;/p&gt;
{a : 1}
&lt;p&gt;, &lt;/p&gt;
{name:&apos;uniquea&apos;, unique:true}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;db.foo.getIndexes() shows that &apos;uniquea&apos; has not been created.  While we should be checking to avoid creating exact duplicate indexes, my attempt to create a new unique index should succeed, because there isn&apos;t already a unique one.  I might be doing this in preparation for replacing the (non-unique) &apos;a_1&apos; index with &apos;uniquea&apos;.&lt;/p&gt;</description>
                <environment>Windows 7, single instance, no shards</environment>
        <key id="15026">SERVER-2699</key>
            <summary>ensureIndex() fails to create unique index if non-unique index already exists</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="dan@mongodb.com">Daniel Pasette</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Mar 2011 22:46:00 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:29 +0000</updated>
                            <resolved>Tue, 4 Sep 2012 18:18:20 +0000</resolved>
                                    <version>1.8.0-rc1</version>
                                                    <component>Index Maintenance</component>
                                        <votes>4</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="160237" author="brondsem" created="Tue, 4 Sep 2012 18:15:49 +0000"  >&lt;p&gt;This appears to be the same as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2618&quot; title=&quot;Attempting to create a new index that already exists with diff option fails silently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2618&quot;&gt;&lt;del&gt;SERVER-2618&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="139739" author="mbankmann" created="Thu, 5 Jul 2012 08:41:32 +0000"  >&lt;p&gt;version: 2.0.6&lt;br/&gt;
just ran into the same issue. the worst about this is the complete absence of a warning about it.&lt;/p&gt;</comment>
                            <comment id="26353" author="wyuenho" created="Sun, 20 Mar 2011 22:37:12 +0000"  >&lt;p&gt;It seems that ensureIndex() only really does what it&apos;s name suggests, it ensures an index is already in place. If there&apos;s an index already, even if subsequent ensureIndex() calls are issued with different parameters, it doesn&apos;t attempt to change the index. Even worse, there&apos;s no warning or error returned to respond to the caller&apos;s intention.&lt;/p&gt;</comment>
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