Larry Prikockis wrote: > ok... so maybe a better question would be: other than cases of power > failure or something else that caused the server to shut down > unexpectedly and uncleanly, what is the actual risk of data loss? In > my case, the possibility of losing a recent transaction or two in > the hopefully uncommon case of some catastrophic failure might very > well be acceptable in exchange for increased write performance. > > random/unpredictable risk of data loss or corruption for other > reasons is probably NOT acceptable to me though, regardless of the > performance gain. [Barring software bugs,j asynchronous commit does not cause data corruption or unpredictable data loss. You can lose the last batch of transactions on a crash, but even if you do, the data written by previous transactions is valid. Worst case of # of transactions lost is determined by 3x wal_writer_delay. -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
