The parameter disk_async_io is set to True by default and I had set dbwr_io_slaves is set to 1. I just read that if disk_async_io is set to true, then dbwr_io_slaves should not be used. Is this correct?? The problem is that I notice a bottleneck with the DBWR and even with the LGWR. Is there a way to tune this?? I have only 1 CPU on the server. thanx.