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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>
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<item>
            <title>[DOCS-9448] Consider documenting how statistics for views are tracked in top/histogram</title>
                <link>https://jira.mongodb.org/browse/DOCS-9448</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;We should consider documenting how statistics are tracked for views in stats counters like Top and the histogram. As of 3.4.0, MongoDB double-counts operations performed on views: once on the view, and once on the underlying collection that the view resolves to. As an example, consider&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;
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					&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;view1 -&amp;gt; view2 -&amp;gt; view3 -&amp;gt; collection&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;where &lt;tt&gt;a -&amp;gt; b&lt;/tt&gt; indicates that &lt;tt&gt;a&lt;/tt&gt; is a view on &lt;tt&gt;b&lt;/tt&gt;. Then, a query against &lt;tt&gt;view1&lt;/tt&gt; will have stats counters incremented for both the namespaces &lt;tt&gt;view1&lt;/tt&gt; and &lt;tt&gt;collection&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;In terms of counting time, the command&apos;s execution time in &lt;tt&gt;collection&lt;/tt&gt; is the time it took to run the fully-transformed view pipeline against &lt;tt&gt;collection&lt;/tt&gt;. The execution time in &lt;tt&gt;view1&lt;/tt&gt; is the execution time of &lt;tt&gt;collection&lt;/tt&gt;, plus the time spent transforming and processing the original view query.&lt;/p&gt;

&lt;hr /&gt;

&lt;h5&gt;&lt;a name=&quot;OriginalEngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Original Engineering Ticket Description:&lt;/h5&gt;
&lt;p&gt;When executing queries on views, they should be counted both on the underlying collection and on the view itself. It is important to see operations on the underlying collection to decide on indexes etc, and it is important to see operations on the view to know where they come from.&lt;/p&gt;</description>
                <environment></environment>
        <key id="335990">DOCS-9448</key>
            <summary>Consider documenting how statistics for views are tracked in top/histogram</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
                        <labels>
                            <label>read-only-views</label>
                    </labels>
                <created>Fri, 2 Dec 2016 18:19:59 +0000</created>
                <updated>Fri, 24 Mar 2023 20:39:33 +0000</updated>
                            <resolved>Fri, 24 Mar 2023 20:39:32 +0000</resolved>
                                                    <fixVersion>3.4.0</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5299958" author="JIRAUSER1264463" created="Fri, 24 Mar 2023 20:39:33 +0000"  >&lt;p&gt;Closing this out on the grounds that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Details of this request are significantly outdated.&#160;&lt;/li&gt;
	&lt;li&gt;Our documentation has evolved substantially since this request was made.&#160;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Based on this, closing as WON&apos;T DO. Please don&apos;t hesitate to give me a shout or to reopen if you disagree.&lt;/p&gt;</comment>
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