> I did not mean asking for undo from a life-time log. Since FlashBack
> Technology is already there, I just mean that world's most advanced database
> (PostgreSQL, as they say), must have an optimized way for undoing of at
> least a week changes.

You're living in a dream world.  Do you know any Oracle DBs who keep
enough rollback segments to go back a week?

                        regards, tom lane

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