Specifying Compare Block 2 name

If Compare Block 2 does not have the same member name as Compare Block 1, you must code either the PSB2, DBD2, DIR2 or ACB2 keyword to specify the Compare Block 2 name or list of names.

These keywords allow the same values as the PSB, DBD, DIR and ACB keywords.

Related topic

Coding-the-COMPARE-statement

If you do not specify the PSB2, DBD2, DIR2 or ACB2 keyword, or if you specify them without a value, Database Integrity uses the member name(s) specified for Compare Block 1 with the PSB, DBD, DIR or ACB keyword. In this case, if Compare Block 1 has been specified as ALL, Database Integrity compares each member of the Compare Block 1 library with a like-named member in the Compare Block 2 library. Note that the two compare blocks do not have to be of the same type; for instance, Compare Block 1 can be a DBD and Compare Block 2 can be its corresponding ACB.

Unless you know that the two control blocks have different names, it is usually best to use the Compare Block 1 specification instead of specifying the PSB2, DBD2, DIR2, or ACB2 keyword. It is possible to get invalid results by specifying a list for both keywords. Database Integrity compares the first item in the Compare Block 1 list with the first item in the Compare Block 2 list, the second with the second, and so on. If one list contains a member that is not in the other list, the two Compare Blocks selected for comparison would likely be very different.

 

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