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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-4397] Log table scans.</title>
                <link>https://jira.mongodb.org/browse/SERVER-4397</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a query or a command (such as count) is doing a table scan, we should note that in the logs explicitly.&lt;/p&gt;

&lt;p&gt;In addition, we should add a table scans counter for both queries and commands to the server status results. That way, we can graphs table scans in MMS. This would help us diagnose these kinds of problems without having to look at the logs.&lt;/p&gt;

&lt;p&gt;If it&apos;s difficult to determine exactly what qualifies as a table scan, I&apos;d recommend a simple heuristic. For instance, we could log whenever nscanned &amp;gt; 10n and when nscanned &amp;gt; 1000.&lt;/p&gt;</description>
                <environment></environment>
        <key id="25755">SERVER-4397</key>
            <summary>Log table 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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="kbanker">Kyle Banker</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Nov 2011 16:55:21 +0000</created>
                <updated>Fri, 30 Jan 2015 21:52:00 +0000</updated>
                            <resolved>Fri, 30 Jan 2015 21:51:49 +0000</resolved>
                                                                    <component>Logging</component>
                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="818296" author="david.storch" created="Fri, 30 Jan 2015 21:51:21 +0000"  >&lt;p&gt;In 2.6 and onwards, the query plan is included in the &lt;tt&gt;planSummary&lt;/tt&gt; field of the query log lines. This work was done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7754&quot; title=&quot;add index/query plan to currentOp and slow query log&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7754&quot;&gt;&lt;del&gt;SERVER-7754&lt;/del&gt;&lt;/a&gt;. A collection scan plan is indicated in these logs with the string &quot;&lt;tt&gt;planSummary: COLLSCAN&lt;/tt&gt;&quot;. Consider the following code, which enables logLevel 1 and then runs a collection scan:&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;   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.adminCommand({setParameter: 1, logLevel: 1});&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.coll.insert({_id: 1});&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;   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;db.coll.find();&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;A 2.6.7 server generates the following log line:&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;2015-01-30T16:50:01.242-0500 [conn1] query test.coll planSummary: COLLSCAN ntoreturn:0 ntoskip:0 nscanned:1 nscannedObjects:1 keyUpdates:0 numYields:0 locks(micros) r:181 nreturned:1 reslen:38 0ms&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;Closing as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7754&quot; title=&quot;add index/query plan to currentOp and slow query log&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7754&quot;&gt;&lt;del&gt;SERVER-7754&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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