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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-3491] queries that require nothing from document scans documents anyway on indexed queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-3491</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&amp;gt; db.index.find( &lt;/p&gt;
{ subdomain: &quot;sub.domain.com&quot;}
&lt;p&gt;,&lt;/p&gt;
{ __id:1}
&lt;p&gt; ).explain();              &lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor subdomain_1_folder_1_name_1&quot;,&lt;br/&gt;
        &quot;nscanned&quot; : 2002,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 2002,&lt;br/&gt;
        &quot;n&quot; : 2002,&lt;br/&gt;
        &quot;millis&quot; : 6,&lt;br/&gt;
        &quot;nYields&quot; : 0,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;isMultiKey&quot; : false,&lt;br/&gt;
        &quot;indexOnly&quot; : false,&lt;br/&gt;
        &quot;indexBounds&quot; : {&lt;br/&gt;
                &quot;subdomain&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &quot;sub.domain.com&quot;,&lt;br/&gt;
                                &quot;sub.domain.com&quot;&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;folder&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &lt;/p&gt;
{
                                        &quot;$minElement&quot; : 1
                                }
&lt;p&gt;,&lt;/p&gt;
                                {
                                        &quot;$maxElement&quot; : 1
                                }
&lt;p&gt;                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;name&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &lt;/p&gt;
{
                                        &quot;$minElement&quot; : 1
                                }
&lt;p&gt;,&lt;/p&gt;
                                {
                                        &quot;$maxElement&quot; : 1
                                }
&lt;p&gt;                        ]&lt;br/&gt;
                ]&lt;br/&gt;
        }&lt;br/&gt;
}&lt;/p&gt;


&lt;p&gt;&amp;gt; db.index.find( &lt;/p&gt;
{ subdomain: &quot;sub.domain.org&quot;, folder: &quot;&quot; }
&lt;p&gt;,&lt;/p&gt;
{subdomain:1}
&lt;p&gt; ).explain();&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor subdomain_1_folder_1_name_1&quot;,&lt;br/&gt;
        &quot;nscanned&quot; : 1583,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 1583,&lt;br/&gt;
        &quot;n&quot; : 1583,&lt;br/&gt;
        &quot;millis&quot; : 9,&lt;br/&gt;
        &quot;nYields&quot; : 2,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;isMultiKey&quot; : false,&lt;br/&gt;
        &quot;indexOnly&quot; : false,&lt;br/&gt;
        &quot;indexBounds&quot; : {&lt;br/&gt;
                &quot;subdomain&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &quot;sub.domain.org&quot;,&lt;br/&gt;
                                &quot;sub.domain.org&quot;&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;folder&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &quot;&quot;,&lt;br/&gt;
                                &quot;&quot;&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;name&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &lt;/p&gt;
{
                                        &quot;$minElement&quot; : 1
                                }
&lt;p&gt;,&lt;/p&gt;
                                {
                                        &quot;$maxElement&quot; : 1
                                }
&lt;p&gt;                        ]&lt;br/&gt;
                ]&lt;br/&gt;
        }&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;mongo returns __id in both queries anyway, does that mean mongod needs to scan for objectid in objects and uses some other reference in indexes? i&apos;m confused - it shouldn&apos;t touch objects at all for queries like this.&lt;/p&gt;</description>
                <environment>centos x64, mongo-10gen-server-1.8.2-mongodb_1 rpm</environment>
        <key id="20196">SERVER-3491</key>
            <summary>queries that require nothing from document scans documents anyway on indexed queries</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="-1">Unassigned</assignee>
                                    <reporter username="ootada">ttt</reporter>
                        <labels>
                    </labels>
                <created>Wed, 27 Jul 2011 12:35:29 +0000</created>
                <updated>Mon, 29 Aug 2011 15:56:48 +0000</updated>
                            <resolved>Wed, 27 Jul 2011 12:40:38 +0000</resolved>
                                    <version>1.8.2</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="44788" author="ootada" created="Wed, 27 Jul 2011 13:49:26 +0000"  >&lt;p&gt;i see. now that i exclude _id, indexOnly is true, but why would &quot;nscannedObjects&quot; be equal to &quot;nscanned&quot;? how do i get sure that only index is used?&lt;/p&gt;

&lt;p&gt;&amp;gt; db.index.find( &lt;/p&gt;
{ subdomain: &quot;sub.domain.org&quot;, folder: &quot;&quot; }
&lt;p&gt;,{_id:0,subdomain:1,folder:1,name:1} ).explain();&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor subdomain_1_folder_1_name_1&quot;,&lt;br/&gt;
        &quot;nscanned&quot; : 1583,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 1583,&lt;br/&gt;
        &quot;n&quot; : 1583,&lt;br/&gt;
        &quot;millis&quot; : 6,&lt;br/&gt;
        &quot;nYields&quot; : 0,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 0,&lt;br/&gt;
        &quot;isMultiKey&quot; : false,&lt;br/&gt;
        &quot;indexOnly&quot; : true,&lt;br/&gt;
        &quot;indexBounds&quot; : {&lt;br/&gt;
                &quot;subdomain&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &quot;sub.domain.org&quot;,&lt;br/&gt;
                                &quot;sub.domain.org&quot;&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;folder&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &quot;&quot;,&lt;br/&gt;
                                &quot;&quot;&lt;br/&gt;
                        ]&lt;br/&gt;
                ],&lt;br/&gt;
                &quot;name&quot; : [&lt;br/&gt;
                        [&lt;br/&gt;
                                &lt;/p&gt;
{
                                        &quot;$minElement&quot; : 1
                                }
&lt;p&gt;,&lt;/p&gt;
                                {
                                        &quot;$maxElement&quot; : 1
                                }
&lt;p&gt;                        ]&lt;br/&gt;
                ]&lt;br/&gt;
        }&lt;br/&gt;
}&lt;/p&gt;</comment>
                            <comment id="44779" author="scotthernandez" created="Wed, 27 Jul 2011 12:40:38 +0000"  >&lt;p&gt;You must exclude _id to use the indexed only. See the docs here: &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Retrieving+a+Subset+of+Fields#RetrievingaSubsetofFields-CoveredIndexes&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Retrieving+a+Subset+of+Fields#RetrievingaSubsetofFields-CoveredIndexes&lt;/a&gt;&lt;/p&gt;</comment>
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