According to the docs - and as discussed here - , an ALTER TABLE that changes the datatype of a column will enforce a re-calculation of all computed columns of that table. I would usually try to put several modifications like changing several columns in one single ALTER TABLE statement. What implications does that have for the re-calculation:
(In my current case, the re-calculation won't change the contents, and as such it's merely a question of performance; however, in other circumstances it might matter more...) |