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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-11699] Update command: unexpected performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-11699</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a strange behavior related to the update command. The execution time is quite different if the collection has indexes or not.&lt;/p&gt;

&lt;p&gt;I have a document like this:&lt;br/&gt;
{&lt;br/&gt;
    &quot;data1&quot;: 1,&lt;br/&gt;
    &quot;array1&quot;: [&lt;br/&gt;
        &lt;/p&gt;
{
            &quot;a&quot;: &quot;1a&quot;,
            &quot;b&quot;: &quot;1b&quot;
        }
&lt;p&gt;,&lt;/p&gt;
        {
            &quot;a&quot;: &quot;2a&quot;,
            &quot;b&quot;: &quot;2b&quot;
        }
&lt;p&gt;    ]&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;If I execute an update like this (to add a field) in 10000 elements collection:&lt;br/&gt;
db.collupdate({},{$set:{data2: 1}}, &lt;/p&gt;
{multi:true}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;It takes:&lt;br/&gt;
 nscanned:10011 nmoved:16 nupdated:10000 keyUpdates:0 numYields: 37 locks(micros) w:24836011 16787ms&lt;/p&gt;

&lt;p&gt;If I create an index on field &quot;array1.a&quot; and repeat the same test, the result is quite different:&lt;br/&gt;
nscanned:10009 nmoved:9 nupdated:10000 keyUpdates:0 numYields: 1384 locks(micros) w:365091225 184838ms&lt;/p&gt;

&lt;p&gt;Why the index is affecting so much? I don&apos;t understand why if the index is not defined on that field is affecting in the time execution.&lt;/p&gt;

&lt;p&gt;Thanks a lot&lt;/p&gt;

&lt;p&gt;Raul&lt;/p&gt;</description>
                <environment></environment>
        <key id="98423">SERVER-11699</key>
            <summary>Update command: unexpected performance</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="raul.diaz_rodriguez@alcatel-lucent.com">Raul Diaz</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Nov 2013 11:43:48 +0000</created>
                <updated>Wed, 10 Dec 2014 23:04:18 +0000</updated>
                            <resolved>Sat, 21 Dec 2013 14:40:13 +0000</resolved>
                                    <version>2.4.5</version>
                                                    <component>Index Maintenance</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="474068" author="asya" created="Sat, 21 Dec 2013 14:39:57 +0000"  >&lt;p&gt;duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8192&quot; title=&quot;Optimize btree key generation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8192&quot;&gt;&lt;del&gt;SERVER-8192&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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