On Oct 21, 2007, at 12:56 PM, Gregory Stark wrote:
"Rajarshi Guha" <[EMAIL PROTECTED]> writes:
The table itself is about 10M rows corresponding to 14GB.
Each row is on average 1.4kB ?
Yes, though some rows may 10's of Kb
Perhaps you should send more details of the
table definition and the typical size of each column. It's possible
you have
the columns you're selecting on being stored out of line
("toasted") which
would hurt performance if you're often accessing many of those
columns.
The SELECT is simply selecting the cube column and another text
column which just contains ID's. One of the columns can be large and
does involve toasting - but that column is never selected in the query
However, after running a few random queries, it appears that the
index is loaded into memory after which all my queries (I tested
10,000) run in under 10 sec. Even for relatively large bounding boxes
I get under 60 sec query times.
Thanks to everybody for pointing me in the right direction!
-------------------------------------------------------------------
Rajarshi Guha <[EMAIL PROTECTED]>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
-------------------------------------------------------------------
The Heineken Uncertainty Principle:
You can never be sure how many beers you had last night.
---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faq
