Hk, Guoping, Guoping Zhang wrote: > a) The tests consists of ten thousands very small transactions, which are > not grouped, that is why so slow with compare to set fsync off. If those transactions are submitted by concurrent applications over several simulataneous connections, playing with commit_delay and commit_siblins may improve your situation. HTH, Markus -- Markus Schaber | Logical Tracking&Tracing International AG Dipl. Inf. | Software Development GIS Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org