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Do we have to code specifically for multiple cores or does the OS handle using multiple cores transparently?

The system limitation is that one single active thread can use maximum one core.
Likely your payload consists of more than one thread so in general you don't have to care.
The limitation normally shows up on single-threaded batch jobs that are unable to use more than one core.
Unless you have option 26 ( DB2 Symmetric Multiprocessing ) installed, then the database can use more than one core for data retrieval for a single requester thread.

Best regards

Stefan


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