• Subject: RE: Record Length - Trivia
  • From: John P Carr <jpcarr@xxxxxxxxxxxx>
  • Date: Wed, 13 Oct 1999 21:54:43 -0400


If you are doing Straight imput,  Consecutive reads,  no random access,
CPF,  I mean  OS/400 will block the imput from disk to main memory.  
(This can be enhanced/modified via OVRDBF NBRRCDS etc.)

So your program will read from memory more often, The blocks 
transfered from disk to memory will contain more records,  
you will be doing more Logical I/O's and less Physical I/O's.

May see some benefit when reading lots of records.

Same is true for Straight Output.  

TRIVIA QUESTION;

If there were such a thing as an optimal record length what would it be ?

John Carr



> From: Scott Swaim [mailto:scott@qualitycorps.com]
> Sent: Wednesday, October 13, 1999 11:23 AM
> To: Midrange List
> Subject: Record Length
> 
> 
> Is it better to have a shorter record length and more records
> or a longer record length and less records?
> 
> ex:
> 
> Rcd length =   80       # of rcds = 10,000 OR
> Rcd length = 160       # of rcds = 5,000
> 
> Scott Swaim
> scott@qualitycorps.com



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