SQL> @resource_waits

EVENT                                    TIME_WAITED AVERAGE_WAIT
---------------------------------------- ----------- ------------
write complete waits                         3816218       212.02
buffer busy waits                            1395921        21.79
enqueue                                       503217       529.15
log file switch completion                    144263        90.11
latch free                                     31173         0.61
free buffer waits                              19352       302.38
row cache lock                                   876        73.00
library cache pin                                131        18.71
library cache load lock                           29         2.64