Radoslaw Skorupka wrote:

>We have two output files, rather huge ones (rather gigabytes than MB's) with 
>LRECL~1500, FB.
>The goal is to compare them and find different records.
>While I have some ideas how to do it (even ISPF Compare or ICETOOL) I don't 
>think it would effective.

>Any clues?

Since you don't say what will happens when you get a record which appears in 
file 1 or file 2 or in both files, look at 

https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.icea100/ice2ca_Example_3_-_Create_files_with_matching_and_non-matching_records.htm

I quote from above URL: 

This example shows how you can match records in input data sets 1 and 2 to 
produce three output data sets with:

    ON fields that appear in both input data set 1 and input data set 2
    ON fields that appear only in input data set 1
    ON fields that appear only in input data set 2

HTH! 

Groete / Greetings
Elardus Engelbrecht

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