Although there are differences between the batch and
CICS®
runtime
components in the way that they intercept application program VSAM calls,
functionally they are equivalent. This component performs a number of
functions:
- It intercepts the VSAM calls within your application programs.
- In CICS programs,
it analyzes the call to decide if the target file has been migrated
to DB2®.
If the file has been migrated, it loads and processes the appropriate
CICS VT
driver modules. In batch programs,
CICS
VT is enabled via JCL changes.
- It accesses
DB2 to process the data.
- It builds the equivalent of the VSAM or
CICS
return codes that drive your program logic.