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    <title>MongoDB Jira</title>
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    <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-4462] ensuring unique index on collection with duplicate breaks cursor</title>
                <link>https://jira.mongodb.org/browse/SERVER-4462</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Given a collection A with 10000 documents, each containing one property `name`, in which 2 documents have the same name, if we execute ensureIndex with option unique on name and immediately follow with a find() for all documents, the index fails (as expected) but the find() only returns with 101 documents.&lt;/p&gt;

&lt;p&gt;Here is an example using Mongoose on Nodejs:&lt;br/&gt;
&lt;a href=&quot;https://gist.github.com/1449032&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/1449032&lt;/a&gt;&lt;/p&gt;</description>
                <environment>Ubuntu 11.10 64bit</environment>
        <key id="26284">SERVER-4462</key>
            <summary>ensuring unique index on collection with duplicate breaks cursor</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="5">Cannot Reproduce</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="aheckmann">Aaron Heckmann</reporter>
                        <labels>
                            <label>indexing</label>
                            <label>query</label>
                    </labels>
                <created>Thu, 8 Dec 2011 22:42:55 +0000</created>
                <updated>Tue, 6 Dec 2022 05:38:37 +0000</updated>
                            <resolved>Tue, 22 May 2018 21:13:40 +0000</resolved>
                                    <version>1.8.1</version>
                    <version>2.0.1</version>
                                                    <component>Index Maintenance</component>
                                        <votes>9</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1898926" author="milkie" created="Tue, 22 May 2018 21:13:40 +0000"  >&lt;p&gt;This is no longer an issue.&lt;/p&gt;</comment>
                            <comment id="142780" author="daniel.sinclair@nupe.com" created="Fri, 13 Jul 2012 15:44:23 +0000"  >&lt;p&gt;+1 on Windows x64&lt;/p&gt;

&lt;p&gt;I can confirm this breaks a collection with as few as two items. Once you&apos;ve added an item twice with the same key (where a Unique Index has been applied) it won&apos;t (add? or) find anything else after that.&lt;/p&gt;

&lt;p&gt;Essentially, I think it means you can&apos;t use Unique Indexes without safe mode.&lt;/p&gt;</comment>
                            <comment id="140321" author="nmccready" created="Fri, 6 Jul 2012 14:31:40 +0000"  >&lt;p&gt;I can confirm this bug in OSX as well.&lt;/p&gt;</comment>
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