Lizette, the default DISP for existing datasets is OLD,KEEP, not OLD,DELETE.
-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] Sent: Thursday, December 08, 2005 10:22 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: 'ALLOCATE' a data set in my TSO/E session Johnny, When allocating any dataset under TSO or BATCH I always ensure the DISP parameter is properly set. If you just code a DD statement of //DD1 DD DSN=datasetname Then the default DISP is OLD,DELETE. That means at job termination the data set will be deleted. I will let others on the list address how DFSMS might change that statement. So if you are using ALLOOCATE DSN(CENTER.UADS) DD(SYSUADS) During the time of your TSO session, the CENTER.UADS data set is allocated with OLD which is an EXCLUSIVE enq and not SHARED. I would use instead ALLOCATE DSN(CENTER.UADS) DD(SYSUADS) SHR REUSE To make sure the defaults are not used and a data sets is not accidentally deleted. I am not sure if the default for ALLOCATE under TSO is OLD,DELETE as well. If it is, then you also risk accidentally deleting the data set when it is freed from your TSO session. The whole point is if you do not specify a DISP parm then the default of OLD is usually used. That creates an exclusive ENQ and no one else can use the file until it is released. Second, you probably need to review the TSO/E REXX and TSO CLIST manuals. They have many examples on how to set up CLIST and REXX execs that run in Batch or TSO. Lizette Koehler ---------------------------------------------------------------------- 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 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: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
