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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-49929] Policy for placing system collections in admin or config DB</title>
                <link>https://jira.mongodb.org/browse/SERVER-49929</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &quot;admin&quot; and &quot;config&quot; databases each contain a handful of system collections, holding replica set or sharding state. I think the admin and config DBs were historically distinguished by different locking rules, but these days there is no rationale for keeping them separate.&lt;/p&gt;

&lt;p&gt;Let&apos;s consider merging them. However, it seems likely that merging them is more difficult than it&apos;s worth. In that case, let&apos;s add to the Replication Architecture Guide some information about these two databases, and a policy for where new system collections are placed as we develop new features in the future.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1422128">SERVER-49929</key>
            <summary>Policy for placing system collections in admin or config DB</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="13201">Fixed</resolution>
                                        <assignee username="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Jul 2020 17:34:19 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:14 +0000</updated>
                            <resolved>Mon, 5 Oct 2020 17:33:20 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="3425873" author="xgen-internal-githook" created="Mon, 5 Oct 2020 17:26:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;username&apos;: &apos;ajdavis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49929&quot; title=&quot;Policy for placing system collections in admin or config DB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49929&quot;&gt;&lt;del&gt;SERVER-49929&lt;/del&gt;&lt;/a&gt; Describe system collections in arch guide&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/03b9dce2762f3ebc8989f9802f982eb7e855a2be&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/03b9dce2762f3ebc8989f9802f982eb7e855a2be&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3311295" author="kaloian.manassiev" created="Wed, 29 Jul 2020 06:57:35 +0000"  >&lt;p&gt;I don&apos;t think it is true that we don&apos;t allow transactions on the config database. We certainly use transactions for refining the document shard key (&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt; to confirm). Perhaps it&apos;s only certain &lt;tt&gt;config&lt;/tt&gt; collections that disallow it?&lt;/p&gt;</comment>
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