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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-7944] add index hint support for operations that read indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-7944</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="59478">SERVER-7944</key>
            <summary>add index hint support for operations that read indexes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                            <label>usability</label>
                    </labels>
                <created>Fri, 14 Dec 2012 20:19:16 +0000</created>
                <updated>Tue, 6 Dec 2022 05:26:40 +0000</updated>
                            <resolved>Wed, 17 Jan 2018 17:30:22 +0000</resolved>
                                                                                        <votes>63</votes>
                                    <watches>60</watches>
                                                                                                                <comments>
                            <comment id="1776837" author="jason.coombs@yougov.com" created="Wed, 17 Jan 2018 17:57:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14227&quot; title=&quot;add index hint support for distinct command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14227&quot;&gt;&lt;del&gt;SERVER-14227&lt;/del&gt;&lt;/a&gt; is the ticket for distinct index hints.&lt;/p&gt;</comment>
                            <comment id="1776800" author="asya" created="Wed, 17 Jan 2018 17:29:41 +0000"  >&lt;p&gt;Since hint use has been added for aggregation and other tickets are tracking hint use with update, distinct and map-reduce, I&apos;m closing this ticket as done.&lt;/p&gt;</comment>
                            <comment id="1548780" author="asya" created="Thu, 13 Apr 2017 19:01:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27848&quot; title=&quot;Add index hint to aggregation and non-materialized views&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27848&quot;&gt;&lt;del&gt;SERVER-27848&lt;/del&gt;&lt;/a&gt; has implemented hint support for aggregate command.&lt;/p&gt;

&lt;p&gt;This ticket is now tracking other commands which use indexes and don&apos;t have hint support.&lt;/p&gt;</comment>
                            <comment id="1106693" author="hoyt ren" created="Mon, 7 Dec 2015 02:26:10 +0000"  >&lt;p&gt;I believe here is another issue relative&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20616&quot; title=&quot;Plan ranker sampling from the beginning of a query&amp;#39;s execution can result in poor plan selection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20616&quot;&gt;SERVER-20616&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Could we rise the priority of this issue.&lt;/p&gt;</comment>
                            <comment id="924980" author="nate@lever.co" created="Wed, 27 May 2015 18:17:36 +0000"  >&lt;p&gt;Hints on aggregations would be extremely helpful for optimizing our reporting feature.&lt;/p&gt;</comment>
                            <comment id="803604" author="emoshe" created="Tue, 13 Jan 2015 19:11:47 +0000"  >&lt;p&gt;Thank you &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;, indeed quick benchmarking indicates that the real performance is identical with and without the hint. I wasn&apos;t aware of explain not using cached indexes, although it definitely makes sense. &lt;/p&gt;</comment>
                            <comment id="803584" author="asya" created="Tue, 13 Jan 2015 18:51:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=elad.moshe%40capriza.com&quot; class=&quot;user-hover&quot; rel=&quot;elad.moshe@capriza.com&quot;&gt;elad.moshe@capriza.com&lt;/a&gt; Aggregation doesn&apos;t do anything different than regular query - and regular query should not be scanning available plans every time - note that explain() is a special case and it does not use cached indexes, so the output you pasted does &lt;b&gt;not&lt;/b&gt; indicate that without the hint the query would run longer than with the hint - if this is the cached index, then aggregation $match will use it and it will be as efficient as a regular query that doesn&apos;t need to scan all plans.&lt;/p&gt;

</comment>
                            <comment id="803275" author="emoshe" created="Tue, 13 Jan 2015 12:39:52 +0000"  >&lt;p&gt;This has to get higher priority IMHO.&lt;br/&gt;
In my case, mongo indeed selects the best index, but scanning the available plans takes way too much time (~1800 ms vs 4-8 ms, see below).&lt;br/&gt;
Since aggregation framework cannot use hints, I am unable to use this query at all (1800 ms is unacceptable for my use case).&lt;br/&gt;
I don&apos;t like the idea of planCacheSetFilter as it might affect other queries as well, I want to be able to set the hint on specific query. &lt;br/&gt;
Currently  since the result set is relatively small, I am running the query with find and doing the rest of the calculations on my server which is far from being ideal. &lt;/p&gt;

&lt;p&gt;------&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;n&quot; : 873,&lt;/span&gt;&lt;/pre&gt;
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			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nscannedObjectsAllPlans&quot; : 1773,&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;scanAndOrder&quot; : false,&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;indexOnly&quot; : false,&lt;/span&gt;&lt;/pre&gt;
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			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;indexBounds&quot; : {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		],&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;			[&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;				1421145151236,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;				Infinity&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;			]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		],&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		&quot;archived&quot; : [&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;			[&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;				null,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;				null&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;			]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	},&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;server&quot; : &quot;XXXX:27017&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;filterSet&quot; : false&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;------&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.events.find({source: &apos;htmlClient&apos;,category: &apos;runs&apos;,archived: null, timestamp: {$gt:Date.now() - 864e5/12}}).hint({source: 1, category: 1, timestamp: 1, archived: 1}).explain()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;cursor&quot; : &quot;BtreeCursor source_1_category_1_timestamp_1_archived_1&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;isMultiKey&quot; : false,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;n&quot; : 874,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nscannedObjects&quot; : 874,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nscanned&quot; : 874,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nscannedObjectsAllPlans&quot; : 874,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nscannedAllPlans&quot; : 874,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;scanAndOrder&quot; : false,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;indexOnly&quot; : false,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nYields&quot; : 6,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;nChunkSkips&quot; : 0,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;millis&quot; : 7,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	&quot;indexBounds&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		&quot;source&quot; : [&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;			[&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;				&quot;htmlClient&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;				&quot;htmlClient&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;			]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		],&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;		&quot;category&quot; : [&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="660293" author="asya" created="Wed, 16 Jul 2014 07:26:38 +0000"  >&lt;p&gt;I&apos;m not aware of pymongp lagging in any features.&lt;br/&gt;
There is no way to specify a hint to aggregation, that&apos;s what this ticket is requesting.&lt;/p&gt;
</comment>
                            <comment id="657950" author="vaidabhishek" created="Mon, 14 Jul 2014 13:21:44 +0000"  >&lt;p&gt;Can someone tell me what&apos;s the correct way (syntactically) to provide hint in pymongo (for an aggregation query)? Pymongo seems to be lagging behind most of 2.6+ updates done. &lt;/p&gt;</comment>
                            <comment id="601479" author="luiz.mendes@zahpee.com" created="Thu, 29 May 2014 19:14:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;  , we are using match at the beginning but we are not using sort. Mongodb seems to be trying a lot of plans (indexes) and choosing a less optimal one. &lt;/p&gt;

&lt;p&gt;I&apos;m studying about &quot;Query Plans&quot; and planCacheFilter. My idea is to use &lt;a href=&quot;http://docs.mongodb.org/manual/reference/command/planCacheSetFilter/#dbcmd.planCacheSetFilter&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/command/planCacheSetFilter/#dbcmd.planCacheSetFilter&lt;/a&gt; to &quot;force&quot; mongodb to only look to the optimal index. Is it okay to do this?&lt;/p&gt;</comment>
                            <comment id="601465" author="asya" created="Thu, 29 May 2014 19:02:42 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=luiz.mendes%40zahpee.com&quot; class=&quot;user-hover&quot; rel=&quot;luiz.mendes@zahpee.com&quot;&gt;luiz.mendes@zahpee.com&lt;/a&gt; does your aggregation start with $match and/or $sort that have a choice of more than one index and it&apos;s picking the less optimal one?  It would be helpful to know what the scenario is (and what version you are on, as there may be possible work-arounds  in different versions).&lt;/p&gt;</comment>
                            <comment id="601321" author="luiz.mendes@zahpee.com" created="Thu, 29 May 2014 17:36:57 +0000"  >&lt;p&gt;I really need this. =(&lt;br/&gt;
We are using aggregation and mongodb seems failing miserably at choosing the right index =(&lt;/p&gt;</comment>
                            <comment id="540189" author="asya" created="Tue, 8 Apr 2014 03:04:14 +0000"  >&lt;p&gt;As it turns out, the issue wasn&apos;t the sort, it was returning more than 16MB from shards to mongos.&lt;/p&gt;

&lt;p&gt;Not directly index or $hint related, and at least that issue is resolved by 2.6.0.&lt;/p&gt;</comment>
                            <comment id="540053" author="jonhyman" created="Tue, 8 Apr 2014 00:35:29 +0000"  >&lt;p&gt;Asya, I&apos;ll follow up with you on email separately. It was all over indexed fields, I definitely would not try to sort on an unindexed field over this many documents. The pipeline had a match on A, a sort on B, and then a group. The index is &lt;/p&gt;
{A: 1, B: 1}
&lt;p&gt;.&lt;/p&gt;</comment>
                            <comment id="540022" author="asya" created="Tue, 8 Apr 2014 00:05:21 +0000"  >&lt;p&gt;Note that in 2.6.0 you can use &lt;a href=&quot;http://docs.mongodb.org/master/reference/method/db.collection.aggregate/#example-aggregate-method-explain-option&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explain&lt;/a&gt; feature to see which index would be used - it does &lt;b&gt;not&lt;/b&gt; actually run the aggregation, so you can quickly iterate over possible pipelines till you get the explain you like.&lt;/p&gt;</comment>
                            <comment id="540018" author="asya" created="Tue, 8 Apr 2014 00:01:45 +0000"  >&lt;p&gt;Actually, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jonhyman&quot; class=&quot;user-hover&quot; rel=&quot;jonhyman&quot;&gt;jonhyman&lt;/a&gt; that error indicates that you didn&apos;t have an index to support the $sort - I was specifically suggesting adding $sort that has an available index, in which case it would &lt;b&gt;not&lt;/b&gt; be using in memory sorting and would not exceed RAM limitation.   If you provide some more details (maybe on google groups rather than here) we can see why the correct (or intended) index was not used.&lt;/p&gt;</comment>
                            <comment id="539662" author="jonhyman" created="Mon, 7 Apr 2014 19:58:18 +0000"  >&lt;p&gt;You should be careful when using $sort trick this if you&apos;re aggregating over a lot of data. We aggregate over hundreds of thousands of rows, and we just tried implementing it and spectacularly failed due to &quot;exception: terminating request:  request heap use exceeded 10% of physical RAM&quot;&lt;/p&gt;

&lt;p&gt;As such, we&apos;d still really love to be able to $hint the index in the aggregation framework. We&apos;ve had to do a lot of coding around this but still get bit by this and it cause cause queries to take 10x as long.&lt;/p&gt;</comment>
                            <comment id="478781" author="miro" created="Wed, 8 Jan 2014 08:25:16 +0000"  >&lt;p&gt;very useful feature if you have many indexes&lt;/p&gt;</comment>
                            <comment id="459069" author="asya" created="Wed, 20 Nov 2013 16:10:30 +0000"  >&lt;p&gt;See &lt;a href=&quot;http://docs.mongodb.org/manual/core/aggregation-pipeline/#early-filtering&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/aggregation-pipeline/#early-filtering&lt;/a&gt; second paragraph.&lt;/p&gt;</comment>
                            <comment id="458966" author="niccottrell" created="Wed, 20 Nov 2013 09:31:30 +0000"  >&lt;p&gt;Interesting! The experts always say do a $match as the first step in any aggregation call, but I haven&apos;t seen in the docs that a subsequent sort is combined and sent as a single step to the shards. Will have to try this, but should be a great solution that we can implement immediately! &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="458964" author="asya" created="Wed, 20 Nov 2013 09:10:02 +0000"  >&lt;p&gt;One possible way to &quot;hint&quot; an index would be to add a sort that would be supported by the index you want to use.&lt;/p&gt;

&lt;p&gt;Example: you are matching on a and b and optimizer is choosing index on a, c instead of one on b, d.   If you add $sort:&lt;/p&gt;
{ d:1 }
&lt;p&gt; immediately  before or after $match (doesn&apos;t matter which as they are combined) you will force the optimizer to use b,d index to filter and sort.&lt;/p&gt;</comment>
                            <comment id="458953" author="niccottrell" created="Wed, 20 Nov 2013 07:25:56 +0000"  >&lt;p&gt;Any chance this can be added into 2.5? Or perhaps you clever chaps at Mongodb have an ever better idea how to achieve the same result?&lt;/p&gt;</comment>
                            <comment id="458623" author="jonhyman" created="Tue, 19 Nov 2013 19:06:40 +0000"  >&lt;p&gt;We just got bitten by this. The match query takes 110 seconds in an explain(). If I hint() it, it drops down to 2 seconds which in my app is acceptable.&lt;/p&gt;</comment>
                            <comment id="447412" author="yfinkelstein" created="Mon, 28 Oct 2013 03:10:25 +0000"  >&lt;p&gt;How is this a P4 feature? It&apos;s a P2 at least. Without it it&apos;s scary to use a secondary index in $match queries. &lt;/p&gt;</comment>
                            <comment id="412288" author="niccottrell" created="Tue, 27 Aug 2013 15:32:28 +0000"  >&lt;p&gt;I&apos;d love this too, but I guess I can do a workaround where I do two separate queries. The first is only on the fields in index I work to &apos;virtual&apos; force that index, then match again with the other fields. Right now, the query optimizer doesn&apos;t seem to work and it&apos;s using a very bad index in the matcher &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/sad.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;
</comment>
                            <comment id="412063" author="meson10" created="Tue, 27 Aug 2013 08:03:59 +0000"  >&lt;p&gt;+1&lt;/p&gt;</comment>
                            <comment id="375023" author="teetwoex" created="Sat, 6 Jul 2013 01:19:21 +0000"  >&lt;p&gt;Please add support for this. I can think of so many cases for critical queries that you would want to force mongo to use a certain index. I am currently dealing with this headache and a simple index hint would alleviate the entire problem.&lt;/p&gt;

&lt;p&gt;This doesn&apos;t even seem like a difficult thing to do. Add a new operator called &quot;$hint&quot; and usage would go as such aggregate(&lt;span class=&quot;error&quot;&gt;&amp;#91;{$match:{&amp;quot;x&amp;quot;:1,$hint:&amp;quot;x_1&amp;quot;}}&amp;#93;&lt;/span&gt;)&lt;/p&gt;</comment>
                            <comment id="364003" author="rdickinson" created="Thu, 20 Jun 2013 08:14:31 +0000"  >&lt;p&gt;You can add me to the list of people who need this.  I have an aggregation operation that is critical to my application.  It currently chooses a horribly inefficient index to use because that index happens to be more selective over the first 101 entries than the index custom-designed for exactly this query (as verified using find/explain).  The &quot;correct&quot; index would result in approximately 12,000 documents scanned.  The index that aggregate chooses does essentially the equivalent of a full table scan of 350,000 documents.  The performance is actually significantly worse than even that would indicate, because there are a number of clauses in a top level $or operation.  In the &quot;correct&quot; index case, it scans a total of 12,000 document across all clauses in the $or.  It the degenerate case that aggregate uses, it scans 350,000 documents for EACH clause in the $or, which can add up to tens of millions of document scans.  So anyway, this is an operation that should complete in around 50ms, but instead takes 30-60 seconds or more, and is currently making my app unusable.  I&apos;m investigating a workaround using map-reduce or a bunch of application logic to combine the results of a bunch of separate (hinted) count operations.  It&apos;s not clear whether either of those options is workable.  Based on my performance tuning, I&apos;ve come to the conclusion that you have to hint every significant query in order to ensure decent performance with Mongo at scale, and not being able to do this for aggregate essentially means you can&apos;t use aggregation with Mongo if you care about performance at scale in a complex app (I mean, it &lt;b&gt;might&lt;/b&gt; work if you get lucky with the index picking genie, but that&apos;s no way to plan your development).&lt;/p&gt;</comment>
                    </comments>
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