DF12196 TPFDF ? Allow Parallel IO with LRECS (non-LLR)

TPFUG_Req_Number: DF12196
ORIGIN DATE: 10/23/2012
REQUIREMENT ABSTRACT (required)

TPFDF Parallel IO – TPFDF should provide an option so that normal subfiles can be retrieved using IOs done in parallel rather than sequential.


REQUIREMENT DESCRIPTION (required)

Provide an option within DBDEF so that the file is stored in a format conducive for parallel IO. The file can then be retrieved by doing say up to 16 FINDCs followed by a single WAITC within TPFDF. The application would still continue to read one record at a time as is done today. A copy of the LREC to heap, as is done in case of LLRs BAM, is not needed in this case since the LRECs are small and should be optional.


CRITICAL SUCCESS FACTORS (optional)



ALTERNATIVE SOLUTIONS (optional)

LLRs could be used to implement a solution at the application level. Application will have to do its own management of the smaller lrecs within the LLR. Searching using keys, order of lrecs will again need to be handled by the application. This would be very in-efficient.
SOLUTION CONSIDERATIONS (required)

TPFDF needs to store file pointers multiple file pointers in the 4k block, instead of just the forward chain. This may be stored as TLRECs. Re-coup will also need to be modified to handle this scenario.