On 3/28/06, Jim C. Nasby <jnasby@xxxxxxxxxxxxx> wrote: > Heh, too quick on the send button... > > On Tue, Mar 28, 2006 at 09:42:51PM +0200, PFC wrote: > Actually, it's entirely possible to do stuff like web counters, you just > want to do it differently in PostgreSQL. Simply insert into a table > every time you have a hit, and then roll that data up periodically. > > And using MyISAM is no panacea, either. Trying to keep a web counter in > a MyISAM table means you'll serialize every web page on that counter > update. if you want raw speed, use a sequence for a hit-counter. sequences are wonder-tools and very lightweight. Explain analyze for a sequence nextval on my desktop box reports 47 microseconds. thats 200k sequence updates/second. insert into a table (fsync off/cache write, no keys) is not much slower. PostgreSQL 8.1 saw a lot of performance improvements...but the most important (and least publicized) is the reduced latency of simple queries in high cache enviroments. merlin
