Summary
To find the Hardware-Operating System of the database execute:
SELECT DBMS_UTILITY.PORT_STRING FROM DUAL;
Examples
IBMPC/WIN_NT-8.1.0 - IBM with Windows
x86_64/Linux 2.4.xx - Intel with Linux
HP9000/800-64.0.8.1.0 - PA-RISC HP-UX
IA64/HPUX 64.0.9.0.1 - Itanium2 HP-UX