Carel, You are right. I meant Standby logfile (not snapshot logfile). The 14 rows output is cut & paste mistake (it should be 12 Rows). rule of thumb: '(max.nr.of logfiles for each thread +1 ) * maximum number of threads.' So in my case I should have [ (3+1)*2=8 ] Stanby logfiles. Is that right? I can simply add 8 stanpshot logfiles as below. Right? ALTER DATABASE ADD STANDBY LOGFILE GROUP 11 ('/u01/oradata/primary/sredo11.log') size 10M; : : ALTER DATABASE ADD STANDBY LOGFILE GROUP 18 ('/u01/oradata/primary/sredo18.log') size 10M; Thanks Sami