DB2 for z/OS is the database supported on z/OS. The WebSphere Application Server for z/OS administrative console can be used to configure a login alias for the DB2 for z/OS data sources as follows:
Procedure
Navigate to Security > Global security;
Expand the Java Authentication and Authorization Service option in the Authentication box and select the J2C authentication data option;
Click the New button to open the Configuration screen;
Set the following fields:
Alias = dbadmin
User ID = <database username>
Password = <database password>
Description = The database security alias
where <database username> and <database password> are set to the username and password used to login to the database;