On Mon, 9 May 2011 08:10:57 -0700, Ron Hawkins wrote: > >I suspect that when you add a member to a PDS using ISPF that you are not >satisfying all of the conditions described in "USING DATASETS 3.2.5.4 >Releasing Space." I leave to other to define which one it may be, or >disagree. > >My guess is that when you use ISPF, the last operation before closing the >PDS is to read the directory, which means the last operation before close is >not write, stow, or put. > >I also found that Yes Immediate does not work if you update a PDS in batch >with DISP=SHR. Use IEBGENER to copy in a member with DISP=SHR does not >release space, but simply changing the JCL to DISP=OLD causes unused space >to be released. > And I believe ISPF doesn't ordinarily issue ENQ EXC on SYSDSN, but uses its own integrity mechanism. This might be relevant. An interesting experiment would be TSO ALLOCATE OLD before saving the member with ISPF to see whether Release happens.
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