The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main as well.
"F" <[EMAIL PROTECTED]> writes: > We have IMS 9 on z/OS and I am fairly new to the platform and have a > vested interest in fixing it. Every night we have batch programs that > run which in return keeps our databases offline for a long time and as > a result our applications are not available for processing. > > I want to know why batch programs and databases cannot both be online > at the same time ? If the batch programs read the databases, then why > are they offline ? > > Anyways, what are some ways of ensuring that batch jobs and databases > can both run and be online at the same time ? some recent discussions about "overnight batch window" ... which requires exclusive access to all the information ... as opposed to "online". http://www.garlic.com/~lynn/2008b.html#74 Too much change opens up financial fault lines http://www.garlic.com/~lynn/2008c.html#92 CPU time differences for the same job http://www.garlic.com/~lynn/2008d.html#30 Toyota Sales for 2007 May Surpass GM http://www.garlic.com/~lynn/2008d.html#31 Toyota Sales for 2007 May Surpass GM http://www.garlic.com/~lynn/2008d.html#73 Price of CPU seconds http://www.garlic.com/~lynn/2008d.html#87 Berkeley researcher describes parallel path http://www.garlic.com/~lynn/2008d.html#89 Berkeley researcher describes parallel path http://www.garlic.com/~lynn/2008g.html#55 performance of hardware dynamic scheduling http://www.garlic.com/~lynn/2008h.html#50 Microsoft versus Digital Equipment Corporation there were some number of efforts in the 90s (billions of dollars) that looked at business process re-engineering to leverage killer micros and distributed object-oriented technology to implement "straight-through processing" (eliminating the "overnight batch window"). It turns out that many of these had grandious failures when nobody bothered to do any speeds&feeds until very late in the effort ... frequently belatedly discovering that the distributed object-oriented technology had a factor of 100 times increase in overhead (compared to the typical Cobol batch implementation), totally obliterating any hopes of throughput improvements. ---------------------------------------------------------------------- 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
