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    <title>MongoDB Jira</title>
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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-56297] error explain for one secondary</title>
                <link>https://jira.mongodb.org/browse/SERVER-56297</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi&#160; support,&#160;&lt;/p&gt;

&lt;p&gt;&#160; &#160; &#160;we find&#160; our queris use the error index&#160; by slow logs&#160; :&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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;//2021-04-23T00:34:31.408+0800 I COMMAND  [conn1525857] command region_governance.area_info command: count { count: &quot;area_info&quot;, query: { cityCode: { $in: [ &quot;021&quot; ] }, templateGuid: { $in: [ &quot;T_536751178985275392&quot; ] }, businessType: { $in: [ 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31 ] }, areaStatus: { $in: [ 5 ] }, isDelete: 0 }, $db: &quot;region_governance&quot;, $clusterTime: { clusterTime: Timestamp(1619109260, 35), signature: { hash: BinData(0, 89550148FC85585EE9B2ACA9D09E724805A8AEE0), keyId: 6918301327185412097 } }, lsid: { id: UUID(&quot;eb4fc071-0048-4cd7-8064-6cb49f5a5fa8&quot;) }, $readPreference: { mode: &quot;secondary&quot; } } planSummary: IXSCAN { cityCode: 1, templateType: 1, businessType: 1, operateType: 1, operateUnit: 1, 1000000002: 1 } keysExamined:55686 docsExamined:55670 numYields:438 reslen:170 locks:{ Global: { acquireCount: { r: 439 } }, Database: { acquireCount: { r: 439 } }, Collection: { acquireCount: { r: 439 } } } storage:{} protocol:op_msg 9648ms&lt;/span&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;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160; &#160; 1.we execute&#160; the query on mono shell and get the correct explain which on &apos;index&apos; file,&lt;/p&gt;

&lt;p&gt;&#160; &#160; 2.we hint the error index and get the slow log&apos;s explain which on&#160;&apos;index1&apos; file,&lt;/p&gt;

&lt;p&gt;&#160; &#160; 3. this is a replset , other secondary don&apos;t have the issue.&#160; &#160;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1688238">SERVER-56297</key>
            <summary>error explain for one secondary</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="13202">Works as Designed</resolution>
                                        <assignee username="edwin.zhou@mongodb.com">Edwin Zhou</assignee>
                                    <reporter username="18621325186@163.com">h jy</reporter>
                        <labels>
                    </labels>
                <created>Fri, 23 Apr 2021 06:11:22 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:25 +0000</updated>
                            <resolved>Tue, 4 May 2021 15:22:42 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3754294" author="JIRAUSER1257066" created="Tue, 4 May 2021 15:22:42 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=18621325186%40163.com&quot; class=&quot;user-hover&quot; rel=&quot;18621325186@163.com&quot;&gt;18621325186@163.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I&apos;m not quite sure what is the issue you&apos;re seeing; slow logs are expected when a query takes longer than 100ms. It sounds like you&apos;re forcing an index to be used with performing a query using &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/meta/hint/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$hint&lt;/a&gt;. Looking at the slow log, the index you&apos;ve chosen does not appear to be optimal. The query examines 55k keys and 55k documents, which would explain why the query is slower. I recommend taking a look at &lt;a href=&quot;https://docs.mongodb.com/manual/applications/indexes/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Indexing Strategies&lt;/a&gt; to get a better sense of how to optimize your indexes for your use cases.&lt;/p&gt;

&lt;p&gt;As a reminder, please note that the SERVER project is for bugs and feature suggestions for the MongoDB server. As this ticket does not appear to be a bug, I will now close it. If you need further assistance troubleshooting, I encourage you to ask our community by posting on the &lt;a href=&quot;https://community.mongodb.com&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Developer Community Forums&lt;/a&gt;. If your discussion there leads you to believe that you&apos;ve reached a bug, please follow up here and we will be happy to reopen this ticket!&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
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            <issuekey id="1688241">SERVER-56298</issuekey>
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