Hi Dmitry,

> Anyway, I have a test case when 2 databases with the same data
> gives different plans. If I change bad plan at DB 1 to the good plan
> from DB2, query time will be same and the best.
> So, we have case when optimizer incorrectly uses cost estimation.

Could you publish the scripts somewhere or send them to me privately? I'd
like to take a detailed look.

Cheers,
Dmitry