I have been using PostgreSQL (currently 7.4.7) for several years now and
am very happy with it but I currently run a website that has had a
little bit of a boost and I am starting to see some performance problems
(Not necessarily PostgreSQL).
PostgreSQL 8.1.1 should give you greater performance...
The database has been allocated 2Gb worth of shared buffers and I have
tweaked most of the settings in the config recently to see if I could
increase the performance any more and have seen very little performance
gain for the various types of queries that I am running.
That sounds like far too many shared buffers? I wouldn't usually use
more than a few tens of thousands, eg. 10k-50k. And that'd only be on
8.1 that has more efficient buffer management.
Get it into RAM hence the slight delay here. This delay has a serious
impact on the user waiting in the web application.
# select * from test where text = 'uk' ;
Time: 477.739 ms
You need to show us the explain analyze plan output for this. But 477ms
is far too slow for an index scan on a million row table.
max_fsm_pages = 500000 # I am thinking this might be a bit low.
max_fsm_relations = 1000
Maybe do a once-off vacuum full to make sure all your tables are clean?
Chris
