> My argument was that datasets allocated via IEFBR14 are not *physically* > allocated on DASD
What is I/O to the VTOC and VTOCIX, chopped liver? That's as physical as it gets. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of CM Poncelet <[email protected]> Sent: Thursday, August 8, 2019 9:45 PM To: [email protected] Subject: Re: CPU time cost of dynamic allocation I mentioned "temp datasets" because Charles' post referred to them as such: On 08/08/2019 20:17, Charles Mills wrote: > I see > > IEF285I SYS19218.T143507.RA000.xxx00114.R0105346 PASSED > IEF285I SYS19218.T143507.RA000.xxx00114.R0105347 PASSED > IEF285I SYS19218.T143507.RA000.xxx00114.R0105348 PASSED > ... > > And > > IEF285I SYS19218.T143507.RA000.xxx00114.R0105346 DELETED > IEF285I SYS19218.T143507.RA000.xxx00114.R0105347 DELETED > IEF285I SYS19218.T143507.RA000.xxx00114.R0105348 DELETED > ... > > So it looks to me like DSCBs were actually created. > > Charles Meanwhile, yes, they (as temp datasets) are not actually catalogued - but are "PASSED" via the JFCB or JFCBX, or whatever similar else, to subsequent JCL steps. My argument was that datasets allocated via IEFBR14 are not *physically* allocated on DASD - and that this could be checked as per the example JCL and then cross-checked (after the IEFBR14) via ISPF "3.2" and "3.4". Yes, I did suggestDSORG=PS in my example JCL "// DCB=(RECFM=VBA,LRECL=137,BLKSIZE=27998,DSORG=PS)" OPENing such a dataset for READ (rather than WRITE) would probably hit an abend as well as, if not before, hitting the EODAD. HTH Cheers, Chris Poncelet (retired sysprog) On 09/08/2019 00:30, Paul Gilmartin wrote: > On Thu, 8 Aug 2019 23:52:25 +0100, CM Poncelet wrote: > >> FWIW I hesitate to believe that PASSED/DELETED implies that the temp >> datasets were ever physically created on DASD - unless they were OPENed >> for OUTPUT in-between. I think the *physical* alloc happens only on an >> OPEN DCB with MACRF=(PM/L). >> >> Have you tried something like the following with IEFBR14? >> >> '//WHATEVER DD DISP=(,CATLG), >> '// ... > I don't believe temp data sets can be catalogued. > > I'd consider the proof to be whether the data set can be OPENed in a > later step. I'd expect a READ to enter EODAD instantly. > > Specifying DSORG=PS might make a difference. > > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > . > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
