For me is just the best Oracle Book that I saw ever (and I saw many in 10 years working exclusively with Oracle databases). The only book that teaches well the diference between the two Oracle 8 parameters "db_writer_processes" and "dbwr_io_slaves". All the other books that I saw, say that "db_writers" in 7 is now called "dbwr_io_slaves" in 8, and they don't even mention the "db_writer_processes" parameter, and that's wrong. If your O.S. takes good advantage of async.io use "db_writer_processes" (multiple DBWR processes), if not, use "dbwr_io_slaves" (uses only one DBWR process no matter what you put on "db_writer_processes", the "dbrw_io_slaves" are slaves of that process, in this way oracle simulates async.io, but if your O.S. takes advantage of async.io and you use "dbwr_io_slaves", the performance can be a disaster). Waiting for another great book from you and thank you very mutch.