11.03.2016 13:39, liviuslivius wrote: > > I see that in FB3 this was changed and before apply not null to column - > all existed data are validated.
Correct. > Is three some possibility to disable this behavior? Nope. > On my big table with 910 468 710 records this operation take 72 minutes. > I am sure that all records contain value in this field and this check is > then "useless". But Firebird is not that sure. You may forget something and get inconsistent database as a result. Out of curiosity, how often do you change NULL <-> NOT NULL on such big tables? ;-) Dmitry
