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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-11734] Query performance degradation for 2.5-pre</title>
                <link>https://jira.mongodb.org/browse/SERVER-11734</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;2.5-pre nightly show 30% performance query degradation when comparing to 2.4.8 in some scenario&lt;/p&gt;

&lt;p&gt;Test setup&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the single collection has 1040162 doc&lt;/li&gt;
	&lt;li&gt;each doc is of size 1264, and have two field &quot;_id&quot; and &quot;name&quot; of type NumberLong with identical value. Both fields are indexed.&lt;/li&gt;
	&lt;li&gt;run query find({ &quot;_id&quot;: randInt()).one() vs find(
{&quot;name&quot;: randInt() }
&lt;p&gt;).one()&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; Version &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; query with &quot;_id&quot; &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; query with &quot;name&quot; &lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; 2.4.8 ops/s &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;	14549 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 13510.6 &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; 2.4.8 CPU &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 29% 	&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 49% &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; 2.5-pre (2013-11-13) ops/s &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 14319.4 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 10793.4 &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; 2.5-pre CPU &lt;/th&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 60% &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 85% &lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;query explain show following difference&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;2.5-pre show &quot;nscannedObjectsAllPlans&quot; : &amp;amp; &quot;nscannedAllPlans&quot; as 2, and 2.4.8 show them as 1&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;test is done with Ec2 m1.xlarge instance, and can be reproduced consistently&lt;/p&gt;</description>
                <environment></environment>
        <key id="98595">SERVER-11734</key>
            <summary>Query performance degradation for 2.5-pre</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="rui.zhang">Rui Zhang</assignee>
                                    <reporter username="rui.zhang">Rui Zhang</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Fri, 15 Nov 2013 21:25:33 +0000</created>
                <updated>Mon, 11 Jul 2016 17:39:21 +0000</updated>
                            <resolved>Tue, 17 Dec 2013 23:43:12 +0000</resolved>
                                    <version>2.5.3</version>
                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="472262" author="rui.zhang" created="Tue, 17 Dec 2013 23:43:12 +0000"  >&lt;p&gt;based on test results, the initial issue is fixed by optimization. close this ticket. &lt;/p&gt;</comment>
                            <comment id="467389" author="dan@10gen.com" created="Sat, 7 Dec 2013 00:29:19 +0000"  >&lt;p&gt;please re-test with nightly.&lt;/p&gt;</comment>
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