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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>
    </build-info>


<item>
            <title>[SERVER-12774] &quot;nscanned&quot; not logged anymore for queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-12774</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Regular collection scans (without index) don&apos;t log the &quot;nscanned&quot; value anymore:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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;  margin-top: 10px;   margin-bottom: 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;2014-02-19T16:01:08.210+1100 [conn15] query test.mgendata query: { class: &quot;something&quot; } planSummary: COLLSCAN ntoreturn:0 ntoskip:0 keyUpdates:0 numYields:7 locks(micros) r:5110987 nreturned:0 reslen:20 2639ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The same query with &lt;tt&gt;.explain()&lt;/tt&gt; logs the &quot;nscanned&quot; value.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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;  margin-top: 10px;   margin-bottom: 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;2014-02-19T16:01:13.011+1100 [conn15] query test.mgendata query: { query: { class: &quot;something&quot; }, $explain: true } planSummary: COLLSCAN ntoreturn:0 ntoskip:0 nscanned:7100000 keyUpdates:0 numYields:5 locks(micros) r:4789802 nreturned:1 reslen:582 2528ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The &quot;nscanned&quot; value in the log file is important for performance analysis and should always be logged, like in previous versions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="111749">SERVER-12774</key>
            <summary>&quot;nscanned&quot; not logged anymore for queries</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="thomas.rueckstiess@mongodb.com">Thomas Rueckstiess</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Feb 2014 05:11:43 +0000</created>
                <updated>Mon, 11 Jul 2016 17:19:36 +0000</updated>
                            <resolved>Fri, 21 Feb 2014 22:44:30 +0000</resolved>
                                                    <fixVersion>2.6.0-rc1</fixVersion>
                                    <component>Logging</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="505438" author="xgen-internal-githook" created="Wed, 26 Feb 2014 02:24:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12774&quot; title=&quot;&amp;quot;nscanned&amp;quot; not logged anymore for queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12774&quot;&gt;&lt;del&gt;SERVER-12774&lt;/del&gt;&lt;/a&gt; added nscanned and nscannedObjects to slow query log&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7766137467a41c02d053d81b65d55349bd865b29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7766137467a41c02d053d81b65d55349bd865b29&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="503670" author="xgen-internal-githook" created="Sat, 22 Feb 2014 18:09:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: REVERT &apos;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12774&quot; title=&quot;&amp;quot;nscanned&amp;quot; not logged anymore for queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12774&quot;&gt;&lt;del&gt;SERVER-12774&lt;/del&gt;&lt;/a&gt; - added nscanned and nscannedObjects to slow query log&apos;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d0135ad0ed90118ad2015283f22b0219c0df3301&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d0135ad0ed90118ad2015283f22b0219c0df3301&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="503485" author="xgen-internal-githook" created="Fri, 21 Feb 2014 22:43:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12774&quot; title=&quot;&amp;quot;nscanned&amp;quot; not logged anymore for queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12774&quot;&gt;&lt;del&gt;SERVER-12774&lt;/del&gt;&lt;/a&gt; added nscannedObjects to OpDebug&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d073743e91afaae772385198c7c0819fb40cde20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d073743e91afaae772385198c7c0819fb40cde20&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="503484" author="xgen-internal-githook" created="Fri, 21 Feb 2014 22:43:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12774&quot; title=&quot;&amp;quot;nscanned&amp;quot; not logged anymore for queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12774&quot;&gt;&lt;del&gt;SERVER-12774&lt;/del&gt;&lt;/a&gt; added nscanned to slow query log&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1fd728336995a52e4b2ef7bf0770fc51586c552&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1fd728336995a52e4b2ef7bf0770fc51586c552&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="502266" author="benety.goh" created="Thu, 20 Feb 2014 14:42:16 +0000"  >&lt;p&gt;This seems to be an issue in 2.5.5 as well. Can you confirm?&lt;/p&gt;</comment>
                            <comment id="501406" author="thomasr" created="Wed, 19 Feb 2014 14:21:36 +0000"  >&lt;p&gt;Update: &lt;/p&gt;

&lt;p&gt;This only affects 2.5.6-pre- (tested on git hash: 25c2e4b). In 2.5.5 the &quot;nscanned&quot; field was still present.&lt;/p&gt;

&lt;p&gt;And it also affects indexed queries:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &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;  margin-top: 10px;   margin-bottom: 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;2014-02-20T01:16:01.514+1100 [conn4] query test.mgendata query: { class: &quot;foo&quot; } planSummary: IXSCAN { class: 1.0 } cursorid:25939668101 ntoreturn:0 ntoskip:0 keyUpdates:0 numYields:0 locks(micros) r:1701 nreturned:101 reslen:4666 1ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="501388" author="thomasr" created="Wed, 19 Feb 2014 13:48:19 +0000"  >&lt;p&gt;We used to call it &quot;nscanned&quot; in the log file regardless of indexed or unindexed queries. If we now make a distinction between &quot;nscanned&quot; and &quot;nscannedObjects&quot; that&apos;s okay, as long as either one is printed in the query log line. The number is an indication of how much work had to be done, and the ratio between nreturned and nscanned (or nscannedObjects) is an indication on how efficient a query was.&lt;/p&gt;

&lt;p&gt;The unindexed query with .explain() prints &quot;nscanned&quot; currently. If &quot;nscannedObjects&quot; is introduced, both cases (with and without explain()) need to print that instead.&lt;/p&gt;


</comment>
                            <comment id="501376" author="scotthernandez" created="Wed, 19 Feb 2014 13:24:53 +0000"  >&lt;p&gt;Thomas, how is the nscanned value import for performance analysis for a query which doesn&apos;t use an index? &lt;/p&gt;

&lt;p&gt;Do you mean that the &quot;nscannedObjects&quot; would be important but is missing (as well)?&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="67770">SERVER-8912</issuekey>
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                            <attachment id="38110" name="server12774.js" size="2738" author="benety.goh@mongodb.com" created="Thu, 20 Feb 2014 15:42:27 +0000"/>
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