Only if your SYSIN is not DUMMY. When SYSIN for IDCAMS is DUMMY it does (and can do) nothing at all, rather more expensively in CPU time than IEFBR14, but still nothing by comparison.
Only if you are allocating and using REPRO from a DUMMY to a new sequential file or an actual DEFINE for a VSAM cluster for instance would IDCAMS do what you describe. Peter -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of <David> <Mingee> Sent: Wednesday, May 11, 2022 11:46 AM To: [email protected] Subject: Re: Potential Resource Savings Techniques Thanks for your response. IDCAMS does an open and close on the new file and writes zero records, so if RLSE is coded with the SPACE for output file(s) then the unused trks or cyls Are released. Secondary space will be used if needed when data is created in the file later. -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of David Spiegel Sent: Wednesday, May 11, 2022 11:07 AM To: [email protected] Subject: Re: Potential Resource Savings Techniques HI David, I do not understand this at all. How does any program differ from IEFBR14 (with respect to allocation/freeing unused disk space by DD Statement)? Maybe your shop has an Exit or add-on product which does Storage Management? David On 2022-05-11 01:53, <David> <Mingee> wrote: > 5. Consider changing IEFBR14 for allocating new files to IDCAMS with > SYSIN DD DUMMY. This will release unused disk space. ---------------------------------------------------------------------- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
