fix:

Set back db_cache_advice to OFF.
Enable this parameter only when you want to estimate the db_cache_size
parameter value.
'Cas latch' is used to simulate an atomic "compare and swap"
functionality" for those platforms that are thought not to support this
feature in the native
operating system. If the operating system does offer this support then this
latch is unused.
HP does not support CAS so this latch is used.
'Simulator' latches are also used for buffer cache simulation when enabling the
db_cache_advice parameter.

References
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For more information on this init.ora parameter please take a look at Metalink
Note:223299.1: Top Oracle 9i init.ora Parameters Affecting Performance