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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-1576] $or does not use indexes when combined with sort()</title>
                <link>https://jira.mongodb.org/browse/SERVER-1576</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;// First of all, my indexes:&lt;/p&gt;

&lt;p&gt;db.notes.getIndexes() [&lt;/p&gt;

&lt;p&gt;    {&lt;br/&gt;
            &quot;name&quot; : &quot;&lt;em&gt;id&lt;/em&gt;&quot;,&lt;br/&gt;
            &quot;ns&quot; : &quot;qix.notes&quot;,&lt;br/&gt;
            &quot;key&quot; : &lt;/p&gt;
{
                    &quot;_id&quot; : 1
            }
&lt;p&gt;    },&lt;br/&gt;
    {&lt;br/&gt;
            &quot;ns&quot; : &quot;qix.notes&quot;,&lt;br/&gt;
            &quot;name&quot; : &quot;shared_to_1&quot;,&lt;br/&gt;
            &quot;key&quot; : &lt;/p&gt;
{
                    &quot;shared_to&quot; : 1
            }
&lt;p&gt;    },&lt;br/&gt;
    {&lt;br/&gt;
            &quot;ns&quot; : &quot;qix.notes&quot;,&lt;br/&gt;
            &quot;name&quot; : &quot;tags_1&quot;,&lt;br/&gt;
            &quot;key&quot; : &lt;/p&gt;
{
                    &quot;tags&quot; : 1
            }
&lt;p&gt;    },&lt;br/&gt;
    {&lt;br/&gt;
            &quot;ns&quot; : &quot;qix.notes&quot;,&lt;br/&gt;
            &quot;name&quot; : &quot;owner_account_id_1&quot;,&lt;br/&gt;
            &quot;key&quot; : &lt;/p&gt;
{
                    &quot;owner_account_id&quot; : 1
            }
&lt;p&gt;    },&lt;br/&gt;
    {&lt;br/&gt;
            &quot;ns&quot; : &quot;qix.notes&quot;,&lt;br/&gt;
            &quot;name&quot; : &quot;location_2d&quot;,&lt;br/&gt;
            &quot;key&quot; : &lt;/p&gt;
{
                    &quot;location&quot; : &quot;2d&quot;
            }
&lt;p&gt;    }&lt;br/&gt;
]&lt;/p&gt;


&lt;p&gt;// No sorting - $or is fast&lt;/p&gt;

&lt;p&gt;&amp;gt; db.notes.find({$or : [ &lt;/p&gt;
{owner_account_id : ObjectId(&quot;0000000000000000000c7e98&quot;)}
&lt;p&gt;, &lt;/p&gt;
{shared_to : ObjectId(&quot;0000000000000000000c7e98&quot;)}
&lt;p&gt;] }).explain()                     &lt;br/&gt;
{&lt;br/&gt;
        &quot;clauses&quot; : [&lt;br/&gt;
                {&lt;br/&gt;
                        &quot;cursor&quot; : &quot;BtreeCursor owner_account_id_1&quot;,&lt;br/&gt;
                        &quot;nscanned&quot; : 255,&lt;br/&gt;
                        &quot;nscannedObjects&quot; : 255,&lt;br/&gt;
                        &quot;n&quot; : 255,&lt;br/&gt;
                        &quot;millis&quot; : 0,&lt;br/&gt;
                        &quot;indexBounds&quot; : &lt;/p&gt;
{
                                &quot;owner_account_id&quot; : [
                                        [
                                                ObjectId(&quot;0000000000000000000c7e98&quot;),
                                                ObjectId(&quot;0000000000000000000c7e98&quot;)
                                        ]
                                ]
                        }
&lt;p&gt;,&lt;br/&gt;
                        &quot;allPlans&quot; : [&lt;br/&gt;
                                {&lt;br/&gt;
                                        &quot;cursor&quot; : &quot;BtreeCursor owner_account_id_1&quot;,&lt;br/&gt;
                                        &quot;indexBounds&quot; : &lt;/p&gt;
{
                                                &quot;owner_account_id&quot; : [
                                                        [
                                                                ObjectId(&quot;0000000000000000000c7e98&quot;),
                                                                ObjectId(&quot;0000000000000000000c7e98&quot;)
                                                        ]
                                                ]
                                        }
&lt;p&gt;                                }&lt;br/&gt;
                        ]&lt;br/&gt;
                },&lt;br/&gt;
                {&lt;br/&gt;
                        &quot;cursor&quot; : &quot;BtreeCursor shared_to_1&quot;,&lt;br/&gt;
                        &quot;nscanned&quot; : 0,&lt;br/&gt;
                        &quot;nscannedObjects&quot; : 0,&lt;br/&gt;
                        &quot;n&quot; : 0,&lt;br/&gt;
                        &quot;millis&quot; : 0,&lt;br/&gt;
                        &quot;indexBounds&quot; : &lt;/p&gt;
{
                                &quot;shared_to&quot; : [
                                        [
                                                ObjectId(&quot;0000000000000000000c7e98&quot;),
                                                ObjectId(&quot;0000000000000000000c7e98&quot;)
                                        ]
                                ]
                        }
&lt;p&gt;,&lt;br/&gt;
                        &quot;allPlans&quot; : [&lt;br/&gt;
                                {&lt;br/&gt;
                                        &quot;cursor&quot; : &quot;BtreeCursor shared_to_1&quot;,&lt;br/&gt;
                                        &quot;indexBounds&quot; : &lt;/p&gt;
{
                                                &quot;shared_to&quot; : [
                                                        [
                                                                ObjectId(&quot;0000000000000000000c7e98&quot;),
                                                                ObjectId(&quot;0000000000000000000c7e98&quot;)
                                                        ]
                                                ]
                                        }
&lt;p&gt;                                }&lt;br/&gt;
                        ]&lt;br/&gt;
                }&lt;br/&gt;
        ],&lt;br/&gt;
        &quot;nscanned&quot; : 255,&lt;br/&gt;
        &quot;nscanneObjects&quot; : 255,&lt;br/&gt;
        &quot;n&quot; : 255,&lt;br/&gt;
        &quot;millis&quot; : 0&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;// Sort + limit, $or is slow:&lt;/p&gt;


&lt;p&gt;&amp;gt; db.notes.find({$or : [ &lt;/p&gt;
{owner_account_id : ObjectId(&quot;0000000000000000000c7e98&quot;)}
&lt;p&gt;, &lt;/p&gt;
{shared_to : ObjectId(&quot;0000000000000000000c7e98&quot;)}
&lt;p&gt;] }).limit(20).sort(&lt;/p&gt;
{created_at:1}
&lt;p&gt;).explain()&lt;br/&gt;
{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BasicCursor&quot;,&lt;br/&gt;
        &quot;nscanned&quot; : 822547,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 822547,&lt;br/&gt;
        &quot;n&quot; : 20,&lt;br/&gt;
        &quot;scanAndOrder&quot; : true,&lt;br/&gt;
        &quot;millis&quot; : 1505,&lt;br/&gt;
        &quot;indexBounds&quot; : {&lt;/p&gt;

&lt;p&gt;        }&lt;br/&gt;
}&lt;/p&gt;</description>
                <environment>Debian Lenny 4.0, amd64</environment>
        <key id="12685">SERVER-1576</key>
            <summary>$or does not use indexes when combined with sort()</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="niallo">Niall O&apos;Higgins</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Aug 2010 21:52:00 +0000</created>
                <updated>Fri, 7 Mar 2014 01:11:08 +0000</updated>
                            <resolved>Fri, 6 Aug 2010 02:00:36 +0000</resolved>
                                    <version>1.6.0</version>
                                                    <component>Index Maintenance</component>
                    <component>Performance</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="16529" author="aaron" created="Fri, 6 Aug 2010 02:00:36 +0000"  >&lt;p&gt;duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1205&quot; title=&quot;$or sort does not use index ranges expressed in or clauses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1205&quot;&gt;&lt;del&gt;SERVER-1205&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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