We had a usermod that changed all shared ENQs to exclusive when a dataset was opened for update. It might even have been on the CBT mods tape.
Jon L. Veilleux [EMAIL PROTECTED] (860) 636-2683 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Black Sent: Friday, July 28, 2006 10:40 AM To: [email protected] Subject: Re: Data set ENQueues and DEQueues in Jobs > > Is is my understanding and experience that the initiator will ENQ on > all data sets referenced in the JCL (all steps) at job initiation > time. The job will not start even the first step before all ENQs have > been granted. So a job might be "WAITING FOR DATASETS" even if the one > not yet available is only referenced in step nn (nn > 1). > > At step end, the initiator will DEQ any DSNs that are no longer > needed, i.e. those which are not referenced on a DD in any later step. > > It is also my understanding that this is initiator business and > therefore works the same way in either JES2 or JES3 environments. > (I don't talk about main device secheduling in JES3, which only > handles devices, not DSN ENQs). Peter, you are 100% correct. I seem to recall that in the "old days", before OCO, there were USERMODs that changed this. Heck, I think I wrote one myself for SVS. But these have never been standard IBM operation. -- Bruce A. Black Senior Software Developer for FDR Innovation Data Processing 973-890-7300 personal: [EMAIL PROTECTED] sales info: [EMAIL PROTECTED] tech support: [EMAIL PROTECTED] web: www.innovationdp.fdr.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ----------------------------------------- This e-mail may contain confidential or privileged information. If you think you have received this e-mail in error, please advise the sender by reply e-mail and then delete this e-mail immediately. Thank you. Aetna ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
