I have two servers with equal specs, one of them running 8.3.7 and the new server running 8.4.4. The only tweak I have made from the default install (from Ubuntu repositories) is increasing shared_buffers to 768MB. Both servers are running 64-bit, but are different releases of Ubuntu.
This is the query I am running: SELECT DISTINCT test.tid, testresult.trscore, testresult.trpossiblescore, testresult.trstart, testresult.trfinish, testresult.trscorebreakdown, testresult.fk_sid, testresult.fk_tid, test.tname, qr.qrscore, qr.qrtotalscore, testresult.trid, qr.qrid FROM testresult, test, questionresult qr WHERE test.tid = testresult.fk_tid AND qr.fk_trid = testresult.trid ORDER BY test.tid; Results when running on the v8.3.7 server.... Total query runtime: 32185 ms. 700536 rows retrieved. Results when running on the v8.4.4 server.... Total query runtime: 164227 ms. 700536 rows retrieved. Results when running on a different v8.4.4 server with slightly faster hardware and shared_buffers at 1024MB.... (this one has a few more rows of data due to this being the server that is currently live, so it has more recent data) Total query runtime: 157931 ms. 700556 rows retrieved. Anyone have any ideas on where I should start looking to figure this out? I didn't perform any special steps when moving to v8.4, I just did a pg_dump from the 8.3 server and restored it on the new 8.4 servers. Maybe that is where I made a mistake. Thanks! Patrick
