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  2. MIDRANGE-L
  3. November 2017

SQL Performance issues questions

I have a few programs that are retrieving data from files with
approximately 5 to 750 million records.

The program is executing in approximately 15 seconds which in itself is not
bad. However, I would like to improve the performance by processing less
records.

A logical file may provide better performance but I would not like to use a
logical. I have a simple SELECT with JOIN retrieving the data.

I am considering using a VIEW but am wondering if a VIEW would provide
better performance from the point of view that a logical builds a permanent
index filtering the records required.

I have run PRTSQLINF and the programs are using existing logicals and is
not making any suggestions.

My question is, does a VIEW create a similar retrieval in that it will only
read the records in the filter or does it do the filtering at the time the
SELECT is executed hence possibly reading all 750 million records therefor
not gaining anything?

TIA
Darryl Freinkel

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