On Tue, 8 Jul 2014 13:24:33 -0400, John Eells wrote: >TSO/E does not support user IDs with more than 7 characters. The reason >for this is a historical one. TSO/E user ID information was originally >stored in the user attributes data set, UADS. A PDS, UADS has an >8-character limit on member name length. To save space (remember that >2314s and core storage were prevalent when all this was designed), user >ID attributes were split into multiple members, up to 10, when all the >attributes for one user ID would not fit into one block at the block >size used to allocate UADS. If you needed more attributes than could be >contained in 10 members for one or more user IDs, you needed to increase >the block size for UADS. > I understand that those members were updated in-place, avoiding the need for compressing, but precluding overflow/extension of individual members. I suppose PDSE is not supported for UADS.
Why only 10? Up to 36 should have been practical. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
