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Status Under review
Workspace z/TPF Product Family
Categories z/TPFDF
Created by Guest
Created on Apr 22, 2024

RELATED IDEAS

zTPFDF should maintain a count of chain blocks in the prime block trailer

As a database administrator, I need the ability to quickly determine how many chains or data blocks a TPFDF sub-file has, so that I can more easily trouble-shoot excessive I/O, queuing, or contention problems.

The chains would be counted when a PACK operation is triggered during a file CLOSE. The count can be maintained in the trailer section of the prime block of the sub-file.

There is a 4-byte spare area in both the standard TPFDF (STDHD) and the expanded 8-byte address format (ISTD8) block trailers. This will avoid the need to change the layout of either trailer or to expand the block header to make space for this data.

STDSPA DS XL4 S P A R E F I E L D S

ISTD8_SPA DS XL4 <Reserved IBM>

The ZUDFM OAB functional entry would be enhanced to include the chain count in the trailer display.

Idea priority Low

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