SQL> @system_times

EVENT                                                            TIME_WAITED
---------------------------------------------------------------- -----------
CPU used by this session                                             9243158
db file sequential read                                              2413689
db file parallel write                                               1482705
db file scattered read                                                630769
log file sync                                                         484700
log file parallel write                                               462048
control file parallel write                                           188444
enqueue                                                               102925
db file single write                                                   81853
log file switch completion                                             50042
buffer busy waits                                                      35364
SQL*Net message to client                                              23856
write complete waits                                                   14239
rdbms ipc reply                                                         8742
latch free                                                              7675
SQL*Net more data from client                                           4673
switch logfile command                                                  4624
SQL*Net more data to client                                             3132
log file single write                                                   1526
control file sequential read                                             652
log file sequential read                                                 239
library cache pin                                                        162
process startup                                                           53
undo segment extension                                                    39
library cache load lock                                                   33
control file single write                                                 32
buffer deadlock                                                           25
SQL*Net message to dblink                                                  3
SQL*Net break/reset to client                                              2
instance state change                                                      0
SQL*Net more data from dblink                                              0
row cache lock                                                             0