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    <title>MongoDB Jira</title>
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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-17333] Read performance dependency</title>
                <link>https://jira.mongodb.org/browse/SERVER-17333</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have three collections sharded on 2 servers with date as shard key - &lt;/p&gt;

&lt;p&gt;Collection A - 25 million documents with avg bsonSize: 700 bytes (10k -15k docs per day)&lt;/p&gt;

&lt;p&gt;Collection B - 30 million documents with avg bsonSize: 500 bytes (12k -16k docs per day)&lt;/p&gt;

&lt;p&gt;Collection C - 25 million documents with avg bsonSize: 1500 bytes (10k -15k docs per day)&lt;/p&gt;

&lt;p&gt;Collection A &amp;amp; B gives decent (good) read performance like - &lt;br/&gt;
On first hit,  for new date, i get records in almost 1 second (15k docs)&lt;br/&gt;
On second hit, it comes in 10-15 ms (due to cache)&lt;/p&gt;

&lt;p&gt;But Collection C read performance is not as good - &lt;br/&gt;
On first hit,  for new date, takes almost 50 seconds (15k docs, same number)&lt;br/&gt;
Second hit is fast as expected (5-10 ms)&lt;/p&gt;

&lt;p&gt;Collection A &amp;amp; C are replica of each other in terms of Index and Shard Key. Only difference is collection A has fewer keys (50%) in comparison to collection C. And still so much difference in read performance?&lt;/p&gt;

&lt;p&gt;This leads to conclusion - read performance depends on document size of collection. More the size is more time it will take to fetch documents on first hit (when not cached)..Is that right?&lt;/p&gt;

&lt;p&gt;Any way to improve read performance of collection C ?&lt;/p&gt;

&lt;p&gt;Thanks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="185288">SERVER-17333</key>
            <summary>Read performance dependency</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="itsmejainh">Himanshu Jain</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Feb 2015 12:19:51 +0000</created>
                <updated>Fri, 20 Feb 2015 13:54:35 +0000</updated>
                            <resolved>Fri, 20 Feb 2015 13:54:34 +0000</resolved>
                                    <version>2.6.1</version>
                                                    <component>Performance</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="833482" author="ramon.fernandez" created="Fri, 20 Feb 2015 13:54:22 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=itsmejainh&quot; class=&quot;user-hover&quot; rel=&quot;itsmejainh&quot;&gt;itsmejainh&lt;/a&gt;. The SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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