Christophe <xof(at)thebuild(dot)com> writes:
> On Apr 21, 2009, at 12:28 PM, Peter Eisentraut wrote:
>> Yes, but if you are asking that question, you probably really want
>> to use TRUNCATE.
> The advantage of DROP TABLE being, of course, that DROP TABLE is
> transactionally-safe, while TRUNCATE is not.
The above is complete nonsense. They're both going to drop data that
might conceivably be visible in the snapshot of some concurrent
transaction that hasn't yet touched the table (else it would have lock)
but might wish to do so later.
If you use DELETE, you'll be transactionally safe, but the cost is
concomitantly a lot higher than either DROP or TRUNCATE.
regards, tom lane