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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-17611] coll.createIndex on empty collection lasts 50-100 ms (vs 1 ms with Vers. 2)</title>
                <link>https://jira.mongodb.org/browse/SERVER-17611</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When creating a new (empty) collection we also create all corresponding indexes. This was used to take about 1 ms with mongoDB V2. With V3 this now takes between 50 and 150 ms. Is this a bug or a feature?&lt;/p&gt;
</description>
                <environment></environment>
        <key id="189837">SERVER-17611</key>
            <summary>coll.createIndex on empty collection lasts 50-100 ms (vs 1 ms with Vers. 2)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="redmedical">Jochen Br&#252;ggemann</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Mar 2015 18:13:25 +0000</created>
                <updated>Thu, 19 Mar 2015 04:51:21 +0000</updated>
                            <resolved>Tue, 17 Mar 2015 16:34:19 +0000</resolved>
                                    <version>3.0.0</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="855758" author="eliot" created="Tue, 17 Mar 2015 16:34:04 +0000"  >&lt;p&gt;MMAP 3.0 and MMAP 2.6 should have the same performance for this test.&lt;/p&gt;

&lt;p&gt;WiredTiger will be slower as to create a new collection with one index allocates 2 files.&lt;br/&gt;
This is because each collection and index in WT is stored in a different file.&lt;br/&gt;
This requires a few file system calls, which can take some time.&lt;/p&gt;

&lt;p&gt;For MMAP, all the data and indexes for an entire database live in the same files, so for this test its a good bit faster.&lt;/p&gt;

&lt;p&gt;Not really a bug or a feature, just an artifact of some implementation choices that makes sense for each engine.&lt;/p&gt;
</comment>
                            <comment id="855702" author="redmedical" created="Tue, 17 Mar 2015 15:40:49 +0000"  >&lt;p&gt;Both are standalone. One is 3.0.0 (compressed/WiredTiger), the other is 2.6.8. Both have a database named &quot;test&quot; with an empty collection &quot;test&quot; with no indexes. On both we execute the following script:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var t = new Date();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.test.createIndex({test:1},{})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;print(&quot;Completed in ms:&quot;,new Date()-t);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;On 2.6.8 this lasts 1 ms. On 3.0.0. this lasts &amp;gt; 50 ms.&lt;/p&gt;</comment>
                            <comment id="853166" author="ramon.fernandez" created="Mon, 16 Mar 2015 18:16:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=redmedical&quot; class=&quot;user-hover&quot; rel=&quot;redmedical&quot;&gt;redmedical&lt;/a&gt;, unfortunately there&apos;s not enough information above to determine if this is a regression. Can you please send us details on how you&apos;re starting up your deployment, what kind of deployment is it (replica set, standalone), and what are the exact operations where you see the 50-150ms delay?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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