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Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - z Systems Software
Product - z/TPF
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Transaction Processing
Product - z/TPF
Supporting ZVFAC would be too much overhead to VFA. Data collection/reduction gives this information.
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - WebSphere
Product family - Transaction Processing
Product - z/TPF
Component - z/TPF
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Transaction Processing
Product - z/TPF
Component - Runtime
VFA tuning based on ACCESS rates is not enough, if the majority of accesses are FILEs on a VFA IMMediate record ID then you draw a different conclusion than if they are FINDs.
ZVFAC USAGE also shows statistics at the File Address level which is interesting to see how a database is updates, i.e. are the FILE requests for different addresses or concentracted on the same prime ordinal or chain.
Please provide more details on what you are trying to determine/do. The best way to determine if a record is a good VFA candidate is to look at hit rate versus flush rate.
ZVFAC USAGE entry reports VFA buffer accesses by record ID, something Data Collection only does at the system level, this detail is useful as it shows how many buffers (i.e. file addresses) were accessed and which of the addresses were accessed most frequently.
The raw figures cannot be compared to Data Reduction since access count data is lost when a buffer is flushed, so the total is more an indication of VFA efficiency and how the I/O is distributed amongst the records database.
Running data collection with the file collector provides this information.
Running data collection with the file collector provides this information.