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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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<item>
            <title>[SERVER-3059] Is an db.collection.reIndex() required after adding indexes to a collection.</title>
                <link>https://jira.mongodb.org/browse/SERVER-3059</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On a mongo collection with 1.8 Million documents the following steps were taken: &lt;br/&gt;
&amp;gt; db.collection.dropIndexes()&lt;br/&gt;
&amp;gt; db.collection.ensureIndex() // ran this multiple times for the various indexes on it the collection&lt;/p&gt;

&lt;p&gt;At this point the RPS of the application, and mongo&apos;s throughput were a quarter of what they were before the indexes were dropped and readded. &lt;br/&gt;
Then i ran a &lt;br/&gt;
&amp;gt; db.collection.reIndex() &lt;br/&gt;
Which brought the throughput and the RPS back up to the levels it was before the indexes were dropped. &lt;/p&gt;

&lt;p&gt;What i wanted to know was is this expected behavior, and is it recommended to run a reIndex after an index is added to an existing collection. &lt;/p&gt;</description>
                <environment>We are running MongoDB version 1.6.5 on CentOS release 5.5 (Final). &lt;br/&gt;
&lt;br/&gt;
</environment>
        <key id="16730">SERVER-3059</key>
            <summary>Is an db.collection.reIndex() required after adding indexes to a collection.</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="5">Cannot Reproduce</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="puneet.kandhari@demandmedia.com">Puneet Kandhari</reporter>
                        <labels>
                            <label>indexing</label>
                    </labels>
                <created>Fri, 6 May 2011 23:12:03 +0000</created>
                <updated>Fri, 30 Mar 2012 14:37:04 +0000</updated>
                            <resolved>Sat, 7 May 2011 00:55:46 +0000</resolved>
                                    <version>1.6.1</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="31429" author="eliot" created="Sat, 7 May 2011 02:23:51 +0000"  >&lt;p&gt;If you have all of the logs and statistics from when you did it, that would be great.&lt;/p&gt;

&lt;p&gt;Or a script that reproduces the issue.&lt;/p&gt;</comment>
                            <comment id="31425" author="puneet.kandhari@demandmedia.com" created="Sat, 7 May 2011 01:02:48 +0000"  >&lt;p&gt;What information can i provide for reproducing the error. &lt;/p&gt;
</comment>
                            <comment id="31424" author="eliot" created="Sat, 7 May 2011 00:55:36 +0000"  >&lt;p&gt;Doesn&apos;t sound expected, but a little hard to follow without more information.&lt;/p&gt;

&lt;p&gt;You definitely do not need to reIndex after adding an index&lt;/p&gt;
</comment>
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