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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-18857] concurrent index create requested per database or per table</title>
                <link>https://jira.mongodb.org/browse/SERVER-18857</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Docs state that foreground index build locks the database. This makes sense for mmapv1. It shouldn&apos;t be required for WiredTiger &amp;amp; RocksDB. I hope we can support concurrent foreground index build in a database or even on one collection. &lt;/p&gt;

&lt;p&gt;One use case is database reload where a common practice is to load the table with only a PK index, then with one scan of the table do (possibly external) sorts for each of the secondary indexes, then finish each sort and write the secondary index with minimal fragmentation.&lt;/p&gt;

&lt;p&gt;Database reload where the secondary index has already been declared can bog down in the read-modify-write IO required for btrees, like WiredTiger.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/#db.collection.createIndex&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/#db.collection.createIndex&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/faq/concurrency/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/concurrency/&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/build-indexes-in-the-background/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/tutorial/build-indexes-in-the-background/&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/core/index-creation/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/index-creation/&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="208966">SERVER-18857</key>
            <summary>concurrent index create requested per database or per table</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="9">Done</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Sun, 7 Jun 2015 13:23:22 +0000</created>
                <updated>Fri, 25 Jan 2019 14:58:25 +0000</updated>
                            <resolved>Fri, 25 Jan 2019 14:58:25 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>2</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="2127233" author="louis.williams" created="Fri, 25 Jan 2019 14:58:25 +0000"  >&lt;p&gt;Closing this ticket as Gone Away now that all index builds run in the background by default. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37270&quot; title=&quot;Remove foreground index build functionality&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37270&quot;&gt;&lt;del&gt;SERVER-37270&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="958064" author="michael.cahill" created="Mon, 6 Jul 2015 00:52:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mdcallag&quot; class=&quot;user-hover&quot; rel=&quot;mdcallag&quot;&gt;mdcallag&lt;/a&gt; we&apos;ve discussed this, we agree that it should be possible, but it isn&apos;t going to make the cut for the MongoDB 3.2 release.&lt;/p&gt;</comment>
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            <issuekey id="201580">SERVER-18301</issuekey>
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