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  1.  Home
  2. MIDRANGE-L
  3. September 2002

Master file vs. Work file

Hello everybody,

I have to create a report of most popular products based on sales amount in a 
given period.

Case 1
1.      Read an OPNQRYF based on a master file (@ 100,000 records in master 
file)
2.      Write work file based on the selection (@ 1000 records)
3.      Read work file with key1 (@ 1000 records)
4.      Do some processing
5.      Read work file with key 2 (@ 1000 records)
6.      Print report

Case 2
1.      Read an OPNQRYF based on a huge master file
2.      Write work file based on the selection (@ 10 records, yes only 10 
records)
3.      Read work file with key 1 (@ 10 records)
4.      Do some processing
5.      Read OPNQRYF based on the same huge master file (Will it read only 1000 
records selected by OPNQRYF or read again the whole file?)
6.      Print report

Which is the better option? Reading master file twice OR writing work file with 
more records (10 vs. 1000) and read it?

TIA,
Deepak

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