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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-18311] Automatic collection dropping</title>
                <link>https://jira.mongodb.org/browse/SERVER-18311</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB currently supports TTL indexes for removing old documents from a collection.  There are some use cases where it would be useful to extend the concept of TTL behaviour to the collection as a whole.&lt;/p&gt;

&lt;p&gt;A couple of examples:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Automatically dropping old collections when storing time series data using the schema advocated by our &lt;a href=&quot;https://github.com/10gen-labs/hvdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;High Volume Data Feed&lt;/a&gt; reference architecture.&lt;/li&gt;
	&lt;li&gt;Automatically cleaning up temporary aggregation results created by aggregation pipelines with the $out operator.  If each aggregation query outputs to a different temporary collection, the cached aggregation result is most efficiently cleaned up by simply dropping the collection.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="201890">SERVER-18311</key>
            <summary>Automatic collection dropping</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="jon.rangel@mongodb.com">Jon Rangel</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 May 2015 18:51:40 +0000</created>
                <updated>Tue, 6 Dec 2022 04:52:13 +0000</updated>
                            <resolved>Tue, 19 Feb 2019 21:29:57 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2156295" author="milkie" created="Tue, 19 Feb 2019 21:29:57 +0000"  >&lt;p&gt;We believe this kind of logic is better suited to be in the application instead of the server.&lt;/p&gt;</comment>
                            <comment id="904544" author="scotthernandez" created="Mon, 4 May 2015 19:04:50 +0000"  >&lt;p&gt;Assuming this was implemented, how would it work? Can you provide examples of syntax and (unambiguous) usage?&lt;/p&gt;

&lt;p&gt;This sounds like it delves into the realm of scheduled tasks or cron job land. Why should this be a database service, versus using existing application/system/etc features?&lt;/p&gt;

&lt;p&gt;Also, if drop collection is done, where does one draw the line on the next feature request? Copy-collection-ttl, update-fields-ttl, shard-collection-ttl or whatever new variant related to time and values is requested...&lt;/p&gt;</comment>
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