I think they are talking about two different things here. 1) recapturing the de-occupied space in the data portion of a PDS 2) consolidating the multiple extents of a PDS
1) Unless things have changed a lot, PDS inserts and replacements, and even those of the same size, always get put at the end. Although, I believe IBM's PDS update program shipped with software distributions had code to update in place; I am not sure that TSO edit has that functionality. Why else did they come up with PDSEs ( and use VSAM )? Which I think might have performance issues. 2) Using FDRs defrag pulls the various extents together; defragging the dataset. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
