I got a task to go find all transactions that have failed due to a bug, and retry them at night. It sounds simple enough. The retry really means to reimplement the logic that the application would have done at the hands of a user.
My only real concern was what would happen if one of those transactions ran into a problem at night. Sounds like a job for exception processing. At first I just stuck an EXCEPTION handler in the middle of the loop. Of course that resulted in compilation errors.
Well what was I to do? Had to recall that the EXCEPTION is a part of a BEGIN-END pair. So I slapped a BEGIN-END block in the middle of my loop. Within that I added my exception handler. Now the code is rock solid. That is, even if there are some errors, this script will go on.
Good-fast-cheap. Pick two. - I got invited to a meeting with the customer today. There was a problem in production. And the customer wanted answers. When it came time, I explained wha...