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            <title>[SERVER-1528] with new index skipping, nscanned may not accurately predict time cost of a query</title>
                <link>https://jira.mongodb.org/browse/SERVER-1528</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the new btree skipping implementation, currently nscanned counts the number of documents which match the query according to the index spec.  But this can result in situations in which indexes which require skipping have the same nscanned as indexes not requiring skipping.&lt;/p&gt;

&lt;p&gt;One solution is to include in nscanned the number of btree entries touched during skipping.  Currently there&apos;s no way to transfer that information from the btree implementation to the query optimizer, but that can be added.&lt;/p&gt;

&lt;p&gt;I can implement, but sounds like a good idea Eliot?&lt;/p&gt;</description>
                <environment></environment>
        <key id="12610">SERVER-1528</key>
            <summary>with new index skipping, nscanned may not accurately predict time cost of a query</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="9">Done</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
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                <created>Sat, 31 Jul 2010 18:02:23 +0000</created>
                <updated>Tue, 12 Jul 2016 00:20:35 +0000</updated>
                            <resolved>Wed, 4 Aug 2010 05:14:13 +0000</resolved>
                                                    <fixVersion>1.7.0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="16453" author="auto" created="Wed, 4 Aug 2010 03:09:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;astaple&apos;, &apos;name&apos;: &apos;Aaron&apos;, &apos;email&apos;: &apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1528&quot; title=&quot;with new index skipping, nscanned may not accurately predict time cost of a query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1528&quot;&gt;&lt;del&gt;SERVER-1528&lt;/del&gt;&lt;/a&gt; account for expensive skipping operations in nscanned&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/701dc65282b7e154aca20ae1882ae7962c11e0b2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/701dc65282b7e154aca20ae1882ae7962c11e0b2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="16371" author="eliot" created="Mon, 2 Aug 2010 17:07:49 +0000"  >&lt;p&gt;going to make just 1.7 early for now.&lt;br/&gt;
if patch doesn&apos;t seem to bad - then can do earlier perhaps&lt;/p&gt;</comment>
                            <comment id="16345" author="eliot" created="Sat, 31 Jul 2010 18:29:38 +0000"  >&lt;p&gt;Yes but don&apos;t want to change that for 1.6. &lt;/p&gt;</comment>
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