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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-7578] QueryOptimizer not choosing the right key when querying. From a query of 16087 millis to 29 millis</title>
                <link>https://jira.mongodb.org/browse/SERVER-7578</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongos&amp;gt; db.current_views.find({ ts: &lt;/p&gt;
{ $gte: 1352300700, $lt: 1352301000 }
&lt;p&gt;, site: &quot;506f0fea7cbdc70464aea9e9&quot; } ).hint(&lt;/p&gt;
{site:1}
&lt;p&gt;).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;clusteredType&quot; : &quot;ParallelSort&quot;,&lt;br/&gt;
        &quot;shards&quot; : {&lt;br/&gt;
                &quot;vizvid-mongo-1:27019&quot; : [&lt;br/&gt;
                        {&lt;br/&gt;
                                &quot;cursor&quot; : &quot;BtreeCursor site_1&quot;,&lt;br/&gt;
                                &quot;isMultiKey&quot; : false,&lt;br/&gt;
                                &quot;n&quot; : 3413,&lt;br/&gt;
                                &quot;nscannedObjects&quot; : 4470768,&lt;br/&gt;
                                &quot;nscanned&quot; : 4470768,&lt;br/&gt;
                                &quot;nscannedObjectsAllPlans&quot; : 4470768,&lt;br/&gt;
                                &quot;nscannedAllPlans&quot; : 4470768,&lt;br/&gt;
                                &quot;scanAndOrder&quot; : false,&lt;br/&gt;
                                &quot;indexOnly&quot; : false,&lt;br/&gt;
                                &quot;nYields&quot; : 29754,&lt;br/&gt;
                                &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
                                &quot;millis&quot; : 16086,&lt;br/&gt;
                                &quot;indexBounds&quot; : &lt;/p&gt;
{
                                        &quot;site&quot; : [
                                                [
                                                        &quot;506f0fea7cbdc70464aea9e9&quot;,
                                                        &quot;506f0fea7cbdc70464aea9e9&quot;
                                                ]
                                        ]
                                }
&lt;p&gt;,&lt;br/&gt;
                                &quot;server&quot; : &quot;vizvid-mongo-1:27019&quot;&lt;br/&gt;
                        }&lt;br/&gt;
                ]&lt;br/&gt;
        },&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor site_1&quot;,&lt;br/&gt;
        &quot;n&quot; : 3413,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;nYields&quot; : 29754,&lt;br/&gt;
        &quot;nscanned&quot; : 4470768,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 4470768,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 4470768,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 4470768,&lt;br/&gt;
        &quot;millisShardTotal&quot; : 16086,&lt;br/&gt;
        &quot;millisShardAvg&quot; : 16086,&lt;br/&gt;
                                &quot;millis&quot; : 16086,&lt;br/&gt;
                                &quot;indexBounds&quot; : &lt;/p&gt;
{
                                        &quot;site&quot; : [
                                                [
                                                        &quot;506f0fea7cbdc70464aea9e9&quot;,
                                                        &quot;506f0fea7cbdc70464aea9e9&quot;
                                                ]
                                        ]
                                }
&lt;p&gt;,&lt;br/&gt;
                                &quot;server&quot; : &quot;vizvid-mongo-1:27019&quot;&lt;br/&gt;
                        }&lt;br/&gt;
                ]&lt;br/&gt;
        },&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor site_1&quot;,&lt;br/&gt;
        &quot;n&quot; : 3413,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;nYields&quot; : 29754,&lt;br/&gt;
        &quot;nscanned&quot; : 4470768,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 4470768,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 4470768,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 4470768,&lt;br/&gt;
        &quot;millisShardTotal&quot; : 16086,&lt;br/&gt;
        &quot;millisShardAvg&quot; : 16086,&lt;br/&gt;
        &quot;numQueries&quot; : 1,&lt;br/&gt;
        &quot;numShards&quot; : 1,&lt;br/&gt;
        &quot;indexBounds&quot; : &lt;/p&gt;
{
                &quot;site&quot; : [
                        [
                                &quot;506f0fea7cbdc70464aea9e9&quot;,
                                &quot;506f0fea7cbdc70464aea9e9&quot;
                        ]
                ]
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;millis&quot; : 16087&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;###########################&lt;br/&gt;
.... Now with the hint ....&lt;br/&gt;
###########################&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; db.current_views.find({ ts: &lt;/p&gt;
{ $gte: 1352300700, $lt: 1352301000 }
&lt;p&gt;, site: &quot;506f0fea7cbdc70464aea9e9&quot; } ).hint(&lt;/p&gt;
{ts:1, site:1}
&lt;p&gt;).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;clusteredType&quot; : &quot;ParallelSort&quot;,&lt;br/&gt;
        &quot;shards&quot; : {&lt;br/&gt;
                &quot;vizvid-mongo-1:27019&quot; : [&lt;br/&gt;
                        {&lt;br/&gt;
                                &quot;cursor&quot; : &quot;BtreeCursor ts_1_site_1&quot;,&lt;br/&gt;
                                &quot;isMultiKey&quot; : false,&lt;br/&gt;
                                &quot;n&quot; : 3413,&lt;br/&gt;
                                &quot;nscannedObjects&quot; : 3413,&lt;br/&gt;
                                &quot;nscanned&quot; : 3472,&lt;br/&gt;
                                &quot;nscannedObjectsAllPlans&quot; : 3413,&lt;br/&gt;
                                &quot;nscannedAllPlans&quot; : 3472,&lt;br/&gt;
                                &quot;scanAndOrder&quot; : false,&lt;br/&gt;
                                &quot;indexOnly&quot; : false,&lt;br/&gt;
                                &quot;nYields&quot; : 1,&lt;br/&gt;
                                &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
                                &quot;millis&quot; : 27,&lt;br/&gt;
                                &quot;indexBounds&quot; : &lt;/p&gt;
{
                                        &quot;ts&quot; : [
                                                [
                                                        1352300700,
                                                        1352301000
                                                ]
                                        ],
                                        &quot;site&quot; : [
                                                [
                                                        &quot;506f0fea7cbdc70464aea9e9&quot;,
                                                        &quot;506f0fea7cbdc70464aea9e9&quot;
                                                ]
                                        ]
                                }
&lt;p&gt;,&lt;br/&gt;
                                &quot;server&quot; : &quot;vizvid-mongo-1:27019&quot;&lt;br/&gt;
                        }&lt;br/&gt;
                ]&lt;br/&gt;
        },&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor ts_1_site_1&quot;,&lt;br/&gt;
        &quot;n&quot; : 3413,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;nYields&quot; : 1,&lt;br/&gt;
        &quot;nscanned&quot; : 3472,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 3472,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 3413,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 3413,&lt;br/&gt;
        &quot;millisShardTotal&quot; : 27,&lt;br/&gt;
        &quot;millisShardAvg&quot; : 27,&lt;br/&gt;
        &quot;numQueries&quot; : 1,&lt;br/&gt;
        &quot;numShards&quot; : 1,&lt;br/&gt;
        &quot;indexBounds&quot; : &lt;/p&gt;
{
                &quot;ts&quot; : [
                        [
                                1352300700,
                                1352301000
                        ]
                ],
                &quot;site&quot; : [
                        [
                                &quot;506f0fea7cbdc70464aea9e9&quot;,
                                &quot;506f0fea7cbdc70464aea9e9&quot;
                        ]
                ]
        }
&lt;p&gt;,&lt;br/&gt;
        &quot;millis&quot; : 29&lt;br/&gt;
}&lt;/p&gt;</description>
                <environment>Linux vizvid-mongo-1 3.2.0-31-virtual #50-Ubuntu SMP Fri Sep 7 16:36:36 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux 8GB ram</environment>
        <key id="55511">SERVER-7578</key>
            <summary>QueryOptimizer not choosing the right key when querying. From a query of 16087 millis to 29 millis</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="eka">Esteban Feldman</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Nov 2012 16:01:28 +0000</created>
                <updated>Fri, 7 Mar 2014 00:57:50 +0000</updated>
                            <resolved>Wed, 7 Nov 2012 16:11:40 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="183590" author="eka" created="Wed, 7 Nov 2012 16:08:58 +0000"  >&lt;p&gt;Ignore this tkt... bad paste... don&apos;t know how to edit or delete the tkt.&lt;/p&gt;

&lt;p&gt;see this instead &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7579&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-7579&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="55512">SERVER-7579</issuekey>
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