Before converting a multiplex into a simplex database, drop all user-defined logical servers.
Use DROP MULTIPLEX SERVER clause WITH DROP LOGICAL SERVER to drop all user-defined logical servers.
The catalog retains this information:
Built-in logical servers
Root logical server policy
Login policy assignments to built-in logical servers
Logical server level overrides for the login policy option. These could exist only for the built-in logical servers.
The information is reused if you convert the simplex database back to multiplex.