Standard Uninstallation with
SDBUNINST 
You can use the SDBUNINST program after you have installed Version 7.4 of the SAP DB software. You can use this program to uninstall SAP DB software from Version 7.2.

Note that the program was first delivered with SAP DB version 7.4, and is therefore only available to you if you have at least one SAP DB version 7.4 installation on your host.
During the standard uninstallation with SDBUNINST, you uninstall the entire SAP DB software on your host.
You
can also use the SDBUNINST program if you only want to uninstall individual
software components. In this case, however, you must consider sequences and
dependencies of software components. For more information about uninstalling
individual software components, see
Uninstalling the SAP
DB Software in the Installation Guide: SAP DB.
· One or more SAP DB software versions are installed on your host. There is at least one installation of version 7.4 among these, which contains the SDBUNINST program.
· You have administration rights for your host.
...
1.
On
UNIX/Linux, switch to the
rootshell.
On Microsoft Windows, open the command prompt on your server.
2.
Stop the
program V Server (service
XServer):
x_server stop
3.
Stop every
SAP DB database instance on your host with the following command:
dbmcli –d
<database_name> -u <dbm_user>,<password>
db_offline
4.
Delete every
SAP DB database instance on your host with the following command:
dbmcli –d
<database_name> -u <dbm_user>,<password>
db_drop
5.
Call the
uninstall program with the option for uninstalling all SAP DB software:
sdbuninst –all
The system
displays a list of all existing SAP DB software components.
6. Start the uninstallation by entering y.
You see a success message about the uninstallation.
All SAP DB software was deleted from your host.