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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-15152] When evaluating plans, some index candidates cause complete index scan</title>
                <link>https://jira.mongodb.org/browse/SERVER-15152</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running query during multiPlanRunner stage some combinations of values and data distribute can cause a fast query have a possible plan/index choice where full index scan (of a non-selective attribute) would be evaluated. Running explain(true) can show which index has unusually high nscanned.&lt;/p&gt;

&lt;p&gt;It seems during race-off the full scan is finished, causing some percentage of queries to be excessively slow.&lt;/p&gt;</description>
                <environment></environment>
        <key id="156517">SERVER-15152</key>
            <summary>When evaluating plans, some index candidates cause complete index scan</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Fri, 5 Sep 2014 02:23:40 +0000</created>
                <updated>Thu, 28 Dec 2017 05:22:25 +0000</updated>
                            <resolved>Thu, 18 Sep 2014 20:56:04 +0000</resolved>
                                    <version>2.6.4</version>
                                    <fixVersion>2.6.5</fixVersion>
                    <fixVersion>2.7.7</fixVersion>
                                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="722479" author="xgen-internal-githook" created="Thu, 18 Sep 2014 21:17:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15152&quot; title=&quot;When evaluating plans, some index candidates cause complete index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15152&quot;&gt;&lt;del&gt;SERVER-15152&lt;/del&gt;&lt;/a&gt; refactor IXSCAN stage to avoid doing too much in one work() cycle&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c7ee53ba9bf48dd958baa4cbc45ec5d6f3683072&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c7ee53ba9bf48dd958baa4cbc45ec5d6f3683072&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="722445" author="david.storch" created="Thu, 18 Sep 2014 20:55:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15125&quot; title=&quot;Index intersection amount of work should be measured incorporating all its phases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15125&quot;&gt;&lt;del&gt;SERVER-15125&lt;/del&gt;&lt;/a&gt; refactor IXSCAN stage to avoid doing too much in one work() cycle&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a7cdcee52937fec949eea4050973bde5c1d825be&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a7cdcee52937fec949eea4050973bde5c1d825be&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="143057">SERVER-14311</issuekey>
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            <issuekey id="146564">SERVER-14525</issuekey>
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            <issuekey id="161860">SERVER-15528</issuekey>
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