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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-84955] Investigate how index scan depends on number of selected documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-84955</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that Index Scan has a hidden initialization cost which somehow not revealed directly by our regression models but revealed indirectly by different values of the n_processed coefficient.&lt;/p&gt;

&lt;p&gt;Design an experiment where the queries selects different number of documents, like 10k, 20k, 30k,..., 150k, try to keep the same number of queries for every point &lt;/p&gt;</description>
                <environment></environment>
        <key id="2150178">SERVER-84955</key>
            <summary>Investigate how index scan depends on number of selected documents</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="13201">Fixed</resolution>
                                        <assignee username="ruoxin.xu@mongodb.com">Ruoxin Xu</assignee>
                                    <reporter username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</reporter>
                        <labels>
                            <label>M6</label>
                    </labels>
                <created>Mon, 3 Oct 2022 14:47:59 +0000</created>
                <updated>Fri, 12 Jan 2024 02:57:41 +0000</updated>
                            <resolved>Thu, 13 Oct 2022 14:04:59 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4898814" author="JIRAUSER1261429" created="Wed, 12 Oct 2022 18:17:20 +0000"  >&lt;p&gt;Yes, we do, per our offline discussion we need at least to try to calibrate on queries that have smaller values of n_proceseed. It is closer to our usual OLTP workflow.&lt;/p&gt;</comment>
                            <comment id="4897515" author="ruoxin.xu" created="Wed, 12 Oct 2022 12:25:29 +0000"  >&lt;p&gt;The experiments show that more documents returned(lager &#8220;n_processed&#8221;) the coefficient (average cost to process one document) is smaller. This is as expected due to some potential hidden initialization cost. For example, as shown in the experiments, when &lt;b&gt;n_processed&lt;/b&gt; is above &lt;b&gt;1e6&lt;/b&gt;, the cost is &lt;b&gt;0.0055&lt;/b&gt;. While the &lt;b&gt;n_processed&lt;/b&gt; is smaller (below &lt;b&gt;5000&lt;/b&gt;), the cost is &lt;b&gt;0.0433&lt;/b&gt;. As discussed, we may want to use more selective queries in calibration?&#160; &#160;Cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alexander.ignatyev%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alexander.ignatyev@mongodb.com&quot;&gt;alexander.ignatyev@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2157855">SERVER-70500</issuekey>
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                            <attachment id="407806" name="IndexScan.html" size="1376239" author="ruoxin.xu@mongodb.com" created="Wed, 12 Oct 2022 12:11:49 +0000"/>
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