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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-2273] Covered index query scans docs</title>
                <link>https://jira.mongodb.org/browse/SERVER-2273</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It seems like it doesn&apos;t use the index (no indexOnly) to get data in the last find.&lt;/p&gt;

&lt;p&gt;&amp;gt; for (var i = 1; i &amp;lt;= 10000; i++) db.things.save(&lt;/p&gt;
{value : i}
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.things.find({value:{$gt: 500}}).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BasicCursor&quot;,&lt;br/&gt;
        &quot;nscanned&quot; : 10000,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 10000,&lt;br/&gt;
        &quot;n&quot; : 9500,&lt;br/&gt;
        &quot;millis&quot; : 15,&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;/p&gt;

&lt;p&gt;        }&lt;br/&gt;
}&lt;br/&gt;
&amp;gt; db.things.ensureIndex(&lt;/p&gt;
{value:1}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; db.things.find({value:{$gt: 500}},&lt;/p&gt;
{value:1}
&lt;p&gt;).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BtreeCursor value_1&quot;,&lt;br/&gt;
        &quot;nscanned&quot; : 9500,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 9500,&lt;br/&gt;
        &quot;n&quot; : 9500,&lt;br/&gt;
        &quot;millis&quot; : 19,&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;/p&gt;
{
                &quot;value&quot; : [
                        [
                                500,
                                1.7976931348623157e+308
                        ]
                ]
        }
&lt;p&gt;}&lt;/p&gt;</description>
                <environment></environment>
        <key id="14057">SERVER-2273</key>
            <summary>Covered index query scans docs</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="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Dec 2010 17:50:48 +0000</created>
                <updated>Wed, 22 Dec 2010 17:53:34 +0000</updated>
                            <resolved>Wed, 22 Dec 2010 17:53:34 +0000</resolved>
                                    <version>1.7.4</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="21715" author="eliot" created="Wed, 22 Dec 2010 17:53:34 +0000"  >&lt;p&gt;You need to say you don&apos;t want the _id index&lt;/p&gt;

&lt;p&gt;db.things.find({value:{$gt: 500}},&lt;/p&gt;
{value:1,_id:0}
&lt;p&gt;).explain()&lt;/p&gt;</comment>
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