Time for another of those little surprises that catch you out after the upgrade.
Take a look at this “Top N” from a standard AWR report, from an instance running 11.2.0.2
Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Avg
wait % DB
Event Waits Time(s) (ms) time Wait Class
------------------------------ ------------ ----------- ------ ------ ----------
direct path read 3,464,056 6,593 2 33.5 User I/O
DB CPU 3,503 17.8
db flash cache single block ph 2,293,604 3,008 1 15.3 User I/O
db file sequential read 200,779 2,294 11 11.6 User I/O
enq: TC - contention 82 1,571 19158 8.0 Other