we have 16GB RAM in a server HPUX 11.11 SAP R3 Enterprise 4.70 2.00 / Oracle 9i and we want to add another 16GB
what are the correct settings profiles SAP and Oracle that has to change when you add another 16GB of RAM
from Database perspective you should consider DB_BLOCK_BUFFERS or DB_CACHESIZE (as of Oracle 9i, alternative to DB_BLOCK_BUFFERS) and SHARED_POOL_SIZE.
SAP will have many parameters major one would be extended memory parameters, buffer size and no of work process. It depends on many factors like SAP application installed, number of users, OS and DB requirements.