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            <title>[SERVER-3503] Optimizer stats don&apos;t seem to be reset after new index</title>
                <link>https://jira.mongodb.org/browse/SERVER-3503</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I had an existing index: &lt;/p&gt;
{l:1, group:1}

&lt;p&gt;I&apos;ve been doing queries like: &lt;/p&gt;

&lt;p&gt;{ t: &quot;&amp;lt;a href=&quot;/graphics-cards/asus-eah5670-di-512md5/&quot;&amp;gt;Asus EAH5670/DI/512M...&quot;, tLcHash: 8661900111881084748, l: &quot;eng&quot;, g: &lt;/p&gt;
{ $ref: &quot;Group&quot;, $id: ObjectId(&apos;4defe4897112ede06261f73a&apos;) }
&lt;p&gt; }&lt;/p&gt;

&lt;p&gt;so I added a new index in the foreground: &lt;/p&gt;
{tLcHash:1, l:1, group:1}

&lt;p&gt;but immediately after, an explain shows:&lt;/p&gt;

&lt;p&gt;{&lt;br/&gt;
	&quot;cursor&quot; : &quot;BtreeCursor l_1_group_1&quot;,&lt;br/&gt;
	&quot;nscanned&quot; : 0,&lt;br/&gt;
	&quot;nscannedObjects&quot; : 0,&lt;br/&gt;
	&quot;n&quot; : 0,&lt;br/&gt;
	&quot;millis&quot; : 2,&lt;br/&gt;
	&quot;nYields&quot; : 0,&lt;br/&gt;
	&quot;nChunkSkips&quot; : 0,&lt;br/&gt;
	&quot;isMultiKey&quot; : false,&lt;br/&gt;
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&lt;p&gt;Are the query stats not getting reset? &lt;/p&gt;</description>
                <environment>EL5</environment>
        <key id="20276">SERVER-3503</key>
            <summary>Optimizer stats don&apos;t seem to be reset after new index</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="niccottrell">Nic Cottrell (Personal)</reporter>
                        <labels>
                    </labels>
                <created>Fri, 29 Jul 2011 07:54:40 +0000</created>
                <updated>Fri, 7 Mar 2014 00:57:19 +0000</updated>
                            <resolved>Fri, 29 Jul 2011 15:12:51 +0000</resolved>
                                    <version>1.8.2</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="45287" author="eliot" created="Fri, 29 Jul 2011 15:12:51 +0000"  >&lt;p&gt;There aren&apos;t any query stats to get reset really.&lt;/p&gt;

&lt;p&gt;Neither index is a perfect match  for that query, so the query optimizer will try both and return whichever finished first.&lt;/p&gt;</comment>
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