As per the oracle recommendation the minimal settings for sga_target should be 800MB and shared_pool_size should be 200MB for all 10G databases to overcome most of the memory related issues in the database.
oracle memery pool

As per the oracle recommendation the minimal settings for sga_target should be 800MB and shared_pool_size should be 200MB for all 10G databases to overcome most of the memory related issues in the database.