OBJECT_CACHE_OPTIMAL_SIZE

Parameter type	Integer
Default value	102400 (100K)
Parameter class	Dynamic: ALTER SESSION, ALTER SYSTEM ... DEFERRED
Range of values	10 KB to operating system-dependent maximum

The object cache is a memory block on the client that allows applications to store entire objects and to navigate among them without round trips to the server. OBJECT_CACHE_OPTIMAL_SIZE specifies (in bytes) the size to which the session object cache is reduced when the size of the cache exceeds the maximum size.