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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>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6840] Auto build compound index without the define</title>
                <link>https://jira.mongodb.org/browse/SERVER-6840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While my clients query with compound field like &lt;/p&gt;
{a: x, b: y}
&lt;p&gt;, my mongodb server automatically started to build compound index &lt;/p&gt;
{a: 1, b: 1}
&lt;p&gt; at the same. Then my server became unresponsive for a while, which made my clients get null result when querying. &lt;br/&gt;
I checked the mongo log and see the following lines: &quot;build index db.col &lt;/p&gt;
{ a: 1, b: 1 }
&lt;p&gt;&quot;, happen very frequently; although I don&apos;t define that compound index.&lt;br/&gt;
I double checked the col index schema, and didn&apos;t find the declaration about the compound index &lt;/p&gt;
{a: 1, b: 1}
&lt;p&gt;.&lt;br/&gt;
Please enlighten me, I had been checking all mongodb documents regarding to this strange behavior but found nothing. It does cause problem.&lt;/p&gt;</description>
                <environment>Amazon Linux 64bit</environment>
        <key id="48026">SERVER-6840</key>
            <summary>Auto build compound index without the define</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="4">Incomplete</resolution>
                                        <assignee username="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="chris.d">Chris Duong</reporter>
                        <labels>
                            <label>indexing</label>
                            <label>query</label>
                    </labels>
                <created>Fri, 24 Aug 2012 10:25:53 +0000</created>
                <updated>Fri, 8 Mar 2013 15:56:00 +0000</updated>
                            <resolved>Wed, 10 Oct 2012 19:11:42 +0000</resolved>
                                    <version>2.0.5</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="156369" author="scotthernandez" created="Fri, 24 Aug 2012 11:26:48 +0000"  >&lt;p&gt;The system will not automatically define or create indexes. Please check your application code and all users who have access to the system to find the cause. The log line where the index build starts will be prefixed by the connection-id which you can look through the logs for to see which client is issueing the command which creates the index.&lt;/p&gt;</comment>
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