If the new column is nullable, it should very little time, since all that happens is
an update to the dictionary. If it is not null, then the column will have to be
physically added to each row with a value.
>>> [EMAIL PROTECTED] 04/05/01 07:15AM >>>
Hello List
We are going to change structure of a big table (more than 250.000.000
rows).
We need to add a column with NUMBER type.
I'm unclear how Oracle do this operation.
Does it mean that Oracle have to read and reformat all table
blocks in order to update each row header?
If yes, I can suggest that estimation of the operation's time is about
time of Full Table Scan on the table.
Is it correct? Please explain.
Ed
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