Zhang, Anna wrote: > Hi, > I just got a new Penguin machine with 2 processors and 2G RAM. After > installed postgres 7.2, I started to modify postgresql.conf to get max > performance. I read Adm Guide and Bruce's article: PostgreSQL Hardware > Performance Tuning, in my understanding, shared_buffers is similar to > Oracle's db_block_buffers, but also sometimes I feel it sounds like oracle's > SGA. When I reached effective_cache_size, don't know what's that, docs can't > help, it seems for optimizer, but how big should I set? no feeling! Does > anyone can compare this paremeter to oracle's so I can understand better. > > If I set SHARED_BUFFERS = 131072, what effective_cache_size should be?
My guess is that effective_cache_size is an estimate of the amount of OS caching memory available, rather than PostgreSQL shared buffers. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026 ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
