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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-32511] Does WiredTiger have performance issue when update a large array of a document</title>
                <link>https://jira.mongodb.org/browse/SERVER-32511</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As the doc said here &lt;a href=&quot;https://docs.mongodb.com/manual/core/write-performance/#document-growth-and-the-mmapv1-storage-engine&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/write-performance/#document-growth-and-the-mmapv1-storage-engine&lt;/a&gt;&lt;br/&gt;
```&lt;br/&gt;
For the MMAPv1 storage engine, if an update operation causes a document to exceed the currently allocated record size, MongoDB relocates the document on disk with enough contiguous space to hold the document. Updates that require relocations take longer than updates that do not, particularly if the collection has indexes. If a collection has indexes, MongoDB must update all index entries. Thus, for a collection with many indexes, the move will impact the write throughput.&lt;br/&gt;
```&lt;br/&gt;
Would this affect WiredTiger ? The official doc said nothing about it and we don&apos;t know if we frequently push something into an array of a document and cause the document growth, would it cause performance issues ?&lt;/p&gt;</description>
                <environment></environment>
        <key id="477767">SERVER-32511</key>
            <summary>Does WiredTiger have performance issue when update a large array of a document</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="9">Done</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="narychen">Roben</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Jan 2018 15:47:19 +0000</created>
                <updated>Wed, 21 Mar 2018 04:32:56 +0000</updated>
                            <resolved>Mon, 12 Feb 2018 18:44:13 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1803190" author="thomas.schubert" created="Mon, 12 Feb 2018 18:44:02 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=narychen&quot; class=&quot;user-hover&quot; rel=&quot;narychen&quot;&gt;narychen&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The issue described by quoted section is specific to MMMAPv1. In WiredTiger, there is a layer of indirection between the document indexed and it&apos;s location on disk, consequently a change in disk location would not require all indexes to be updated. MMAPv1 and WiredTiger have very different performance characteristics and I would recommend testing your schema and access patterns to ensure performance matches your expectations.&lt;/p&gt;

&lt;p&gt;However, please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support regarding schema design and best practices, please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-users group.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
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