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    <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-790] Sort (Ascending|Descending) on non-indexed field (works|asserts)</title>
                <link>https://jira.mongodb.org/browse/SERVER-790</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If I run a sort query (with limit) on a collection in ascending order, everything operates properly:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.signatures.find().sort(&lt;/p&gt;
{numbb:1}
&lt;p&gt;).limit(10)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4b980bcb5506ca18cc00000d&quot;), &quot;numbb&quot; : 2, &quot;symbol&quot; : &quot;gen_raw_REG&quot;, &quot;type&quot; : &quot;ssig&quot;, &quot;signature&quot; : BinData type: 2 len: 67 }
&lt;p&gt;.....&lt;/p&gt;

&lt;p&gt;But I actually want descending order:&lt;br/&gt;
&amp;gt; db.signatures.find().sort(&lt;/p&gt;
{numbb:-1}
&lt;p&gt;).limit(10)&lt;br/&gt;
error: &lt;/p&gt;
{ &quot;$err&quot; : &quot;too much data for sort() with no index&quot; }

&lt;p&gt;Curiously, a smaller limit works properly:&lt;br/&gt;
&amp;gt; db.signatures.find().sort(&lt;/p&gt;
{numbb:-1}
&lt;p&gt;).limit(3)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4b980ed75506ca18cc02d6fb&quot;), &quot;_types&quot; : [ &quot;Signature&quot; ], &quot;symbol&quot; : &quot;_ZN8LargeNet13doBuildInsideEv&quot;, &quot;numbb&quot; : 6323, &quot;_cls&quot; : &quot;Signature&quot;, &quot;signature&quot; : BinData type: 2 len: 2364674, &quot;type&quot; : &quot;ssig&quot; }
&lt;p&gt;....&lt;/p&gt;

&lt;p&gt;For reference, .limit(4) is apparently too large.&lt;/p&gt;

&lt;p&gt;If there&apos;s a good reason for this, so be it.  I&apos;m guessing, however, that this is due to the query optimizer doing quite different things depending on sort order. &lt;/p&gt;</description>
                <environment>Ubuntu 9.10 x64</environment>
        <key id="11567">SERVER-790</key>
            <summary>Sort (Ascending|Descending) on non-indexed field (works|asserts)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="jdd">John Demme</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Mar 2010 10:28:43 +0000</created>
                <updated>Fri, 7 Mar 2014 01:02:45 +0000</updated>
                            <resolved>Fri, 19 Mar 2010 14:02:41 +0000</resolved>
                                    <version>1.2.4</version>
                    <version>1.3.4</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="29359" author="jstastny" created="Wed, 20 Apr 2011 12:30:29 +0000"  >&lt;p&gt;Eliot,&lt;br/&gt;
thanks a lot for a prompt answer. We will create the indexes needed for sorting.&lt;br/&gt;
We run out of the limit quite quickly, because we use MongoDB for storing images (besides other data).&lt;/p&gt;</comment>
                            <comment id="29323" author="eliot" created="Tue, 19 Apr 2011 18:29:58 +0000"  >&lt;p&gt;Currently no.&lt;/p&gt;</comment>
                            <comment id="29278" author="jstastny" created="Tue, 19 Apr 2011 14:37:38 +0000"  >&lt;p&gt;Is there a way to change the limit of 1 MB?&lt;/p&gt;</comment>
                            <comment id="13114" author="eliot" created="Fri, 19 Mar 2010 14:02:41 +0000"  >&lt;p&gt;there is a 1mb limit for how much data we&apos;ll hold in memory to sort.&lt;br/&gt;
most likely, 3 obejcts is less than 1 MB, and 4 is more.&lt;br/&gt;
if you think that is not the case, please re-open&lt;/p&gt;</comment>
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