DFsort evaluates the status of the system at each run, so different runs will 
produce different results and predicting is difficult.
DFsort statistics will show how the sort ran:

ICE055I 0 INSERT 442351, DELETE 442351                               
ICE054I 0 RECORDS - IN: 0, OUT: 0                                    
ICE134I 0 NUMBER OF BYTES SORTED: 84931392                           
ICE253I 0 RECORDS SORTED - PROCESSED: 442351, EXPECTED: 442351       
ICE165I 0 TOTAL WORK DATA SET TRACKS ALLOCATED: 0 , TRACKS USED: 0   <==
ICE199I 0 MEMORY OBJECT USED AS MAIN STORAGE = 0M BYTES              
ICE299I 0 MEMORY OBJECT USED AS WORK STORAGE = 84M BYTES             
ICE180I 0 HIPERSPACE STORAGE USED = 0K BYTES                         
ICE188I 0 DATA SPACE STORAGE USED = 0K BYTES          

This one did not use SORTWKs.               

Kees.

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
> Behalf Of Bill Ashton
> Sent: 09 November, 2018 17:09
> To: [email protected]
> Subject: How to calculate records sorted in memory
> 
> Is there a way that I can determine if my SORT can be done in memory, or
> if
> I will use SORTWK files? I am running IBM DFSORT if that matters.
> 
> For example, I am playing with a file that has about 15 Million records
> (FB, len 49), and the key is the whole 49-byte record. How can I
> determine
> if the whole file can be sorted in memory or not - is there something in
> the output in one of those "x - #######" diagnostic fields that tells me
> anything useful? (BTW, is there any explanation of all those fields?)
> 
> By the way, this is only in my test system. My production file has
> upwards
> of 250 Million records.
> 
> Thank you for whatever you can tell me about this.
> Billy
> 
> --
> Thank you and best regards,
> *Billy Ashton*
> 
> ----------------------------------------------------------------------
> For IBM-MAIN subscribe / signoff / archive access instructions,
> send email to [email protected] with the message: INFO IBM-MAIN
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