Hi all , one of my team member is arguing the following parameters may be help to improve performance to use in RAC 1. _Interconnect_Checksum= FALSE 2. _Cr_Server_Log_Flush= FALSE 3. _immediate_Commit_Propagation= FALSE 4. Commit_Write= "BATCH, NOWAIT" 5. _Optim_Peek_User_Binds= FALSE I wander if anyone has experience with those parameters. (I'm aware the setting hidden parameters is not good practice :-) We've RAC 10.2.0.2 on hp-itanuim Amihay Gonen Dba Team Leader PD Division ECTel Ltd.