This is probably nit-picking, but what purpose does step 2 (add
constraint disable) serve?
Wouldn 't this be effectively the same? Or is there some subtlety that is
going over my head?
add column
update the column where null in batches - committing
add the default
add constraint enable novalidate
update any columns still null
validate the constraint
=20
-- --Original Message-- --
Jonathan Lewis
One thought about adding a column with a default:
the table has to be locked while every row is updated,
and if the update fails, you have a massive rollback.
If this is not something you can spare the time for,=20
you might still want to do something like the following:
add column
add constraint disable novalidate
update the column where null in batches - committing
add the default
enable the constraint novalidate
update any columns still null
validate the constraint
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