When we talk about database upgrades and migrations the most important (and unfortunately time-/resource consuming) activity is testing.
But often testing resources are limited or, even worse, don’t exist. I’ve worked with customers where we migrated a core EBS system off AIX to Linux – but only got a 6 year old Tru64 box for testing purposes (where the recompilation took 20x as long as later on the production environment). Or the classic one: Database is too big thus we test only with 10% of the data.
I know that often your hands are tied. Everybody wants an 1:1 …
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