Scott Marlowe wrote:
You can't change a table in any way without rewriting the whole thing,
resulting in a very long wait and a complete table lock on any alter
table action on big tables. Don't forget that if you've got a really
big table, you need that much space free on the drive to alter the table
for the rewrite that's going to take place.
Forgive a dumb question: What does postgresql do with ALTER TABLE?
What sort of modifications do not require time proportional to the
number of rows in the table?
Jack Orenstein
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