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            <title>[SERVER-2145] Unique queries when missing in cache</title>
                <link>https://jira.mongodb.org/browse/SERVER-2145</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Welcome&lt;br/&gt;
Problem&lt;br/&gt;
Applications are cached query. Some queries are common and relatively long time. When the cache expires, they get to the base. In the same time many customers in cache misses, and asks the same query directly to the database.&lt;br/&gt;
During this time the database gets a big load, and performs the same query to multiple clients in several threads simultaneously causing a decrease database performance.&lt;/p&gt;

&lt;p&gt;Solution&lt;br/&gt;
Useful to a flag (perhaps might get for queries with the flag slaveOK) which allowed the connection to the server queue which performed the same query to the query execution time. Data from this question were to be returned to all customers.&lt;/p&gt;

&lt;p&gt;Place of Implementation&lt;br/&gt;
Mongos sharding or mongod for the replica set&lt;/p&gt;</description>
                <environment></environment>
        <key id="13797">SERVER-2145</key>
            <summary>Unique queries when missing in cache</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ppalka@gratka-technologie.pl">ppalka</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Nov 2010 21:30:12 +0000</created>
                <updated>Fri, 30 Jun 2017 14:29:35 +0000</updated>
                            <resolved>Fri, 30 Jun 2017 14:29:35 +0000</resolved>
                                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="20694" author="eliot" created="Thu, 25 Nov 2010 04:25:12 +0000"  >&lt;p&gt;This is generally something we think is better for the app layer to do  - possibly storing the data in mongo, but controlled by app.&lt;br/&gt;
If people really want this (votes) then perhaps something to look at.&lt;/p&gt;</comment>
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