CWWBB0638E A connection to the database system could not be established: 0.
Explanation
A network or database outage might have occurred, or there might be configuration errors. For more information on the reported error refer to the documentation from your database vendor. Only a system administrator can resolve this error.
User response
If the problem persists, inform your system administrator about the error. Depending on the error reported by the database system, the system administrator should check the resource configuration of the database for errors in the user ID, password, database name, database host, and check the network connectivity and the database availability.