On Fri, Jan 12, 2007 at 09:45:28AM -0800, Mario Behring wrote:
> Simple question: once I execute the delete statement, does it free
> disk space immediatelly? Does Postgres uses something like a
> datafile with a pre-defined size like Oracle does??
What others said; but note that a vacuumed table that has a number of
now-empty slots can actually be a performance advantage, because new
rows don't need to increase the size of the table's on-disk file (so
you incur slightly less I/O). There's a "sweet spot" for this that
you can discover by testing.
A
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