How result_cache_max_size parameter works

Can you please explain the result_cache_max_size parameter in oracle 11g. If we increase or decrease this paramater value what will be the result in terms of performance..
sga is 3GB
result_cache_max_size is 5mb
result_cache_mode is manual
OS is AIX5.3
Oracle version is 11.2.0.1

Our presnt size is 5mb and if we increased it to 250mb will it work, how to calculate the size? pls guide. it should work,by default it use below.
When using the MEMORY_TARGET initialization parameter to specify the memory allocation, Oracle allocates 0.25% of memory_target to the result cache.
When you set the size of the shared pool using the SGA_TARGET initialization parameter, Oracle allocates 0.5% of sga_target to the result cache.
If you specify the size of the shared pool using the SHARED_POOL_SIZE initialization parameter, then Oracle allocates 1% of the shared pool size to the result cache.
http://docs.oracle.com/cd/B28359_01/server.111/b28274/memory.htm#BGBBIACC
and check "7.3.4.1.3 Allocating Additional Memory to the Result Cache"
Thanks
Kuljeet Pal Singh
Edited by: Kuljeet Pal Singh on May 17, 2012 12:14 PM

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