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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-18624] listCollections command should not be O(n^2) on MMAPv1</title>
                <link>https://jira.mongodb.org/browse/SERVER-18624</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it gets the list of namespaces then gets the CollectionOptions for each namespace. The second step involves a table-scan of system.namespaces. Due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18622&quot; title=&quot;listCollections command should special-case filtering by name.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18622&quot;&gt;&lt;del&gt;SERVER-18622&lt;/del&gt;&lt;/a&gt; this happens even if you are only requesting information for a single namespace.&lt;/p&gt;

&lt;p&gt;Instead, the storageEngine API should have a way to get all namespaces and their CollectionOptions in one pass. This should speed up both MMAP and KVCatalog-based engines.&lt;/p&gt;</description>
                <environment></environment>
        <key id="205889">SERVER-18624</key>
            <summary>listCollections command should not be O(n^2) on MMAPv1</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 May 2015 21:44:42 +0000</created>
                <updated>Wed, 7 Oct 2015 21:35:58 +0000</updated>
                            <resolved>Mon, 21 Sep 2015 15:46:54 +0000</resolved>
                                                    <fixVersion>3.0.7</fixVersion>
                    <fixVersion>3.1.9</fixVersion>
                                    <component>Performance</component>
                    <component>Storage</component>
                                        <votes>2</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1038942" author="xgen-internal-githook" created="Mon, 21 Sep 2015 20:58:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18624&quot; title=&quot;listCollections command should not be O(n^2) on MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18624&quot;&gt;&lt;del&gt;SERVER-18624&lt;/del&gt;&lt;/a&gt; Track location of collection in system.namespaces&lt;/p&gt;

&lt;p&gt;This makes it constant time to get the collection options for a collection,&lt;br/&gt;
reducing the complexity of the listCollections command and other operations.&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/72db604ab2c9a4425f5876c0cbe021c709d67fa4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/72db604ab2c9a4425f5876c0cbe021c709d67fa4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1038418" author="xgen-internal-githook" created="Mon, 21 Sep 2015 15:45:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18624&quot; title=&quot;listCollections command should not be O(n^2) on MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18624&quot;&gt;&lt;del&gt;SERVER-18624&lt;/del&gt;&lt;/a&gt; Track location of collection in system.namespaces&lt;/p&gt;

&lt;p&gt;This makes it constant time to get the collection options for a collection,&lt;br/&gt;
reducing the complexity of the listCollections command and other operations.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d08604d76f5d419cd2d210b3199f8912de33db9c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d08604d76f5d419cd2d210b3199f8912de33db9c&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="229076">SERVER-20336</issuekey>
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            <issuekey id="205887">SERVER-18622</issuekey>
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