We use one global subschema for every ADS dialog and COBOL program.
What are the pros and cons of using a large global subschema versus a smaller tailored subschema?
Global subschemas are easier to maintain but require more storage space. Tailored subschemas require more work to maintain but need less storage space.
The size of the subschema affects the following:
The larger the subschema the more ADS storage is allocated per task and the more database storage is allocated per run-unit.
To prevent resource contention and poor performance it is always best to use a tailored subschema rather than one big global subschema.