DB_BLOCK_LRU_LATCHES LRU latch contention has always been a source of frustration on multiprocessor machines; this parameter relieves much of the pain. Set it to your number of CPUs, and watch the MISSES and IMMEDIATE_MISSES columns in the V_$LATCH table diminish.Version: V7.3 Default Value: CPU_COUNT/2 Values: 1 to the number of CPUs
http://community.freebsdchina.org/document.php?topic=1738&forum=41
Default Value: CPU_COUNT/2
Values: 1 to the number of CPUs