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DB2 Subsystem

The DB2 subsystem is the DB2 SYSID of the DB2 system to access for the test. The default for this field is the DB2 subsystem that is specified for your target environment. You can override the target environment specification on the Target Environment and Construction Libraries panel.

For testing, use a DB2 subsystem that is not used for production. This is especially important when testing changes to a program that is also running in production.

More information:

Specify Target Environment for HE