3
votes
1answer
133 views

Why is add timestamp column with default not null so slow in Oracle 11g?

In Oracle I need to add a new column with type timestamp with time zone to a large table (80 million rows). I cannot have more than 30 - 60 seconds of downtime when I run it in production. This ...
1
vote
2answers
2k views

How to set addtime(current_timestamp, '15:00:00') as MySQL timestamp column default value?

I want to set `addtime(current_timestamp, '15:00:00') as the default value of one MySQL table column. I tried to do this with the following command but failed: mysql> alter table mytable change c1 ...