> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Black > Sent: Wednesday, November 22, 2006 4:55 PM > To: [email protected] > Subject: Re: Data Retention Question > > > > > > I've also seen it done by accident. Part of the > > production run deletes and redefines a dataset > > (IEFBR14). Next, program 1 updates it, then program 2 > > reads it. One day, program 2 got the previous day's > > data. User tried again with same result. As it turned > > out, there was only the one area available to reallocate > > the dataset - right where it was, before. Program 1 had no > > data for that dataset, so it never opened and closed it, so > > there was no EOF written. Program 2 read the old data. > You could consider this to be a flaw in program 1. If it has > no data to > output, it should still open and close the output file to > indicate this. > > -- > Bruce Black
I remember in the deep, dark past, that we did this sort of thing with TAPE datasets and UNIT=(TAPE,DEFER) in order to "save a tape mount" for datasets which were rarely produced. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. ---------------------------------------------------------------------- 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
