Oracle AMM

memory_max_target >= memory_target>=sga_max_size>=sga_target

example:

ALTER SYSTEM SET memory_max_target='2147483648' SCOPE=SPFILE;
ALTER SYSTEM SET memory_target='2147483648' SCOPE=SPFILE;
ALTER SYSTEM SET db_cache_size='4194304' SCOPE=SPFILE;
ALTER SYSTEM SET java_pool_size='0' SCOPE=SPFILE;
ALTER SYSTEM SET pga_aggregate_target='0' SCOPE=SPFILE;
ALTER SYSTEM SET shared_pool_size='0' SCOPE=SPFILE;
ALTER SYSTEM SET sga_max_size='2147483648' SCOPE=SPFILE;
ALTER SYSTEM SET sga_target='0' SCOPE=SPFILE;

 '0 = auto'