Role administrators are responsible for granting and revoking user-defined roles to users and other roles. You can add and remove role administrators as needed. There is no maximum number of role administrators that can be granted to a single role. However, there is a minimum number, as specified by the min_role_admins database option.
There are also global role administrators, which are any users that have the MANAGE ROLES system privilege. Global role administrators can administer user-defined roles for which no administrator has been specified.
Global role administrators are the sole administrators of the system roles.
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