@Pierre: i know.. but first i'd have to find such a query from real-life. And also, i'm convinced that this query would be faster with a seqscan if the data wenen't cached.
@Arjen: thanks, that helps.
But that's only the OS cache. There's also the shared_buffers, which are a postgres specific thing.
I've found DISCARD in the
manual, but that only influences a single session, not the shared buffers.
I reckon restarting the cluster should help, would it wipe out the cache? (pg_ctlcluster 8.3 main restart)
Or is there a more graceful way?
Cheers,
WBL
On Thu, Aug 26, 2010 at 7:37 PM, Pierre C
<lists@peufeu.com> wrote:
The bitmap heap scan is 3% faster,
--
"Patriotism is the conviction that your country is superior to all others because you were born in it." -- George Bernard Shaw