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At 10:30 AM 01/21/2000 -0500, you wrote:
Typically RPG programs are written to read and
lock data areas at program
initialization and not release the locks until termination with LR
on. Vendor
programmers rarely seem to realize the operational implications of such
things.
Save-while-active (SWA) is more like save-while-almost-active.
If you use it properly, you typically have to quiesce the system for a
short period of time. Otherwise you have to journal and use
commitment control, have somewhat more difficult save procedures and
significantly more difficult restore procedures.
If you are using SWA today, and you don't use journaling and commitment
control in every multi-file program, then your backup is not valid!
SWA is one of the few parts of OS/400 that permits you to shoot yourself
in the foot. I have asked Rochester for SWA enhancements to
alleviate this, and they are being considered. I think that we can
except SWA improvements, but unfortunately out many releases.
IMHO, SWA today is likely not properly implemented at most
accounts. Last Fall COMMON, "Ask the Experts" night at
CUDS was immediately after my SWA pitch, and I had no less than 35
accounts come up to me and admit that their SWA strategy was
broken. (If anyone wants a copy of my COMMON presentation on SWA
and the article that I wrote for AS/400 experts journal last year, please
send private mail to me
at my other address [barsa@ibm.net].
Midrange Computing also sells a video of my pitch, although that was shot
prior to the significant enhancements in SWA V4R1, so it is heavily
discounted.)
Al
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Al Barsa, Jr. - Account for Midrange-L
Barsa Consulting, LLC.
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Phone: 914-251-1234
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