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Mike Cunningham wrote:
Does anyone know the system internals well enough to know what might cause the first system backup after an IPL to run longer? We IPL weekly (lets not get into a discussion of this being necessary) and we have a backup script that runs one series of saves Monday night through Friday night and a compressed one on Sat and Sun (we are not open weekends). Sunday we IPL. Every monday night the backup takes 4 hours, tuesday-friday it's 3 1/2 hours. I know some database stats get cleared on an IPL. Could this be causing longer backups?
There has been comments here to the fact the IBM tags an object the first time it is touched after an IPL. This overhead is what some people say makes a backup longer After an IPL. For best perfomance they say Backup then IPL.


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