idle events in 10gR2

I just noticed this morning that idle events are very easily identifiable by a new column called wait_class in 10gR2

To ignore idle event, I just wrote

select WAIT_CLASS, event
from (
  select * 
  where WAIT_CLASS#!=6
  order by TIME_WAITED_MICRO desc)
where rownum<6 ;

------------- ----------------------------------------
System I/O    log file parallel write                  
Configuration log file switch (checkpoint incomplete)
Configuration log file switch completion             
System I/O    db file parallel write                 
System I/O    control file parallel write            

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