Deleting the Registration of a Variant of the Current Database Instance 
Use
You can register several variants of one
database instance (Registering a Variant of the Current Database Instance). The difference between these variants is that they use different variants of the database kernel.
With this command, you remove the specified variant of the current database instance from the server. Once you have done this, you will not be able to start this variant of the database instance again. The deletion procedure has no effect on the current
operational state of the database instance. A database instance in ONLINE or ADMIN operational state remains active and is therefore recognized by the system.
All parameters listed here apply only for the Microsoft Windows NT/Windows 2000 operating systems. The command is ignored under the UNIX operating system.
Prerequisites
The database instance is in the
OFFLINE operational state.You have the DBM operator authorization
InstallMgm.Syntax
db_unreg <option>
Options
You use the following options (
<option>) to specify which database instance entry variant is to be deleted: -f | -fast -q | -quick -s | -slowYou should only use the options
-q | –quick and -s | –slow if errors occur and in consultation with
SAP DB Support.
db_unreg myDB -f
The registration of the
fast variant of database instance myDB is deleted.Reply
The system outputs an OK message.
In the event of errors, see
Reply Format.