Because its 11gR1 and RAC, I wonder how much time is *wait for scn ack* contributing to the log file sync wait? There are few bugs on top of 11gR1 related to broadcast on commit scheme of SCN propagation, that you might want to check: Bug 8490879 ? Long ?log file sync? latencies due to broadcast on commit scheme Bug 7716356 ? Long ?log file sync? latencies with broadcast on commit scheme in RAC Bug 7610362 ? Long ?log file sync? waits in RAC with broadcast on commit in RAC Regards, Saurabh Manroy In case you are interested, I have written about log file sync waits in rac here: http://tinyurl.com/89k6jem <http://tinyurl.com/89k6jem> On Mon, Apr 30, 2012 at 4:56 PM, CRISLER, JON A <JC1706@xxxxxxx> wrote: > Interesting thoughts Tanel: in this case of this specific app, the > majority of the work is made of up small commits to a handful of tables on > a 6 node RAC cluster. I/O times are generally quite good, and with 32 > cores per node the CPU and load average is very low. Its 11gR1 - I was > wondering if some of the tweaks to put LGWR at "real time" priority that > are mentioned for 10g also apply to 11g. > > -- //www.freelists.org/webpage/oracle-l