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    <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-234] Aggregation is very slow compared to full scans</title>
                <link>https://jira.mongodb.org/browse/SERVER-234</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Filtering by a field that isn&apos;t indexed is extremely fast, however doing a sum over that same field is very slow when using db.group.  I&apos;m sure it has to do with the fact that aggregation takes a function and the javascript server side eval is very slow, but would it be possible to have an aggregation facility that had a similar performance to full scans, which is very fast. &lt;/p&gt;

&lt;p&gt;The query I am using here is: &lt;br/&gt;
db.group( {ns: &quot;testCollection&quot;, key: {}, reduce: function(obj, prev) &lt;/p&gt;
{ prev.csum += obj.field1; }
&lt;p&gt;, initial: &lt;/p&gt;
{ csum: 0 }
&lt;p&gt; })&lt;/p&gt;

&lt;p&gt;Sum isn&apos;t the only interesting aggregation to make fast.  The most useful case here would be to have a few buckets and as we visit each item, we place one of it&apos;s fields in a bucket based to collect a histogram of stats.  An example of this would be to count jira bug status codes in one aggregate &lt;/p&gt;
{ blocking: 5, major: 3 ... }
&lt;p&gt;.  &lt;/p&gt;

&lt;p&gt;It just seems to me that if a non-indexed find is fast, than the aggregate case should have similar perf. &lt;/p&gt;
</description>
                <environment></environment>
        <key id="10443">SERVER-234</key>
            <summary>Aggregation is very slow compared to full scans</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="3">Duplicate</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="carrino">John Carrino</reporter>
                        <labels>
                    </labels>
                <created>Fri, 14 Aug 2009 04:08:16 +0000</created>
                <updated>Thu, 10 Sep 2009 10:03:07 +0000</updated>
                            <resolved>Fri, 14 Aug 2009 11:42:23 +0000</resolved>
                                    <version>0.9.7</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="10684" author="eliot" created="Thu, 10 Sep 2009 10:03:07 +0000"  >&lt;p&gt;closed b/c resolved more than 2 week ago&lt;/p&gt;</comment>
                            <comment id="10425" author="eliot" created="Fri, 14 Aug 2009 11:42:23 +0000"  >&lt;p&gt;duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-189&quot; title=&quot;make group command (was: investigate group slowness)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-189&quot;&gt;&lt;del&gt;SERVER-189&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;there are some issues which we fill fix to make this fast.&lt;/p&gt;</comment>
                            <comment id="10423" author="carrino" created="Fri, 14 Aug 2009 04:12:17 +0000"  >&lt;p&gt;The DB console output from running the above command is attached.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="10022" name="mongo_log.txt" size="1517" author="carrino" created="Fri, 14 Aug 2009 04:12:17 +0000"/>
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