SQL> @catperf
...
SQL> SELECT name,1 - (physical_reads / (db_block_gets +consistent_gets)) "HIT_RATIO"
2 FROM sys.v$buffer_pool_statistics
3 WHERE db_block_gets + consistent_gets > 0;
NAME HIT_RATIO
------------------ ----------
KEEP .983520845
RECYCLE .503866235
DEFAULT .790350047