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    <title>MongoDB Jira</title>
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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-21680] Cannot drop oplog.$main</title>
                <link>https://jira.mongodb.org/browse/SERVER-21680</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After converting master/slave replication to replica set (as described on &lt;a href=&quot;https://docs.mongodb.org/manual/core/master-slave/#convert-a-master-slave-deployment-to-a-replica-set&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.org/manual/core/master-slave/#convert-a-master-slave-deployment-to-a-replica-set&lt;/a&gt;), I cannot drop local.oplog.$main collection:&lt;/p&gt;

&lt;p&gt;Error: drop failed: &lt;/p&gt;
{
        &quot;ok&quot; : 0,
        &quot;errmsg&quot; : &quot;can&apos;t drop collection with reserved $ character in name&quot;
}

&lt;p&gt;I need to drop it since &lt;br/&gt;
   1. it has allocated around 4 GB of space&lt;br/&gt;
   2. it is not needed (local.oplog.rs used instead)&lt;br/&gt;
Renaming an oplog is not possible.&lt;/p&gt;

&lt;p&gt;Could you please advise on how to drop it?&lt;/p&gt;

&lt;p&gt;Thank you.&lt;/p&gt;</description>
                <environment></environment>
        <key id="241222">SERVER-21680</key>
            <summary>Cannot drop oplog.$main</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="stephen.steneker@mongodb.com">Stennie Steneker</assignee>
                                    <reporter username="markus714">Marek Jurco</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Nov 2015 09:29:21 +0000</created>
                <updated>Thu, 7 Jan 2016 03:45:37 +0000</updated>
                            <resolved>Thu, 7 Jan 2016 03:45:24 +0000</resolved>
                                    <version>3.0.6</version>
                                                    <component>Admin</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1099384" author="stennie" created="Fri, 27 Nov 2015 01:00:46 +0000"  >&lt;p&gt;Hi Marek,&lt;/p&gt;

&lt;p&gt;It looks like the procedure for converting a master/slave deployment to a replica set is missing a step to remove the &lt;tt&gt;local&lt;/tt&gt; database before initiating the replica set.&lt;/p&gt;

&lt;p&gt;Since newer versions of the MongoDB server have stronger enforcement for collection name validation, there isn&apos;t a straightforward way to drop or rename &lt;tt&gt;local.oplog.$main&lt;/tt&gt; because it includes a reserved character ($).&lt;/p&gt;

&lt;p&gt;A suggested workaround is to &lt;a href=&quot;https://docs.mongodb.org/manual/tutorial/resync-replica-set-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;re-sync a replica set member&lt;/a&gt; that still has the old &lt;tt&gt;local.oplog.$main&lt;/tt&gt; collection.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Stephen&lt;/p&gt;</comment>
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