I will get the trace files
> > error 481 detected in background process > ORA-00481: LMON process terminated with error > ksuitm: waiting for  seconds before killing DIAG
...and I forgot to mention that this 5 second delay is quite often not enough time to get all the DIAG output....especially in chaotic scenarios... you might consider setting the following so you at least get some info... as always, the standard "underbar" parameter setting taboos apply
_ksu_diag_kill_time = 30
> > I understand that error should apply to a RAC database. I am not able > to find out why the database failed. Any lights?