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Home -> Community -> Mailing Lists -> Oracle-L -> Is ALTER TABLE ADD COLUMN a time-consuming operation ?
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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Author: Shevtsov, Eduard
INET: EShevtsov_at_flagship.ru
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