my postgres version is 9.1.2.my machine is dell R710.3000 sessions connect to database concurrently,then doing some insert,delete,update. your meaning my database bottleneck is disk io slowly.i use local disk.i know transaction log need to wirte to disk. thanks.i will monitor it. -- View this message in context: http://postgresql.1045698.n5.nabble.com/postgresql-log-indicate-too-many-execute-S-2-COMMIT-tp5672225p5682141.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general