To check if your Oracle Binary is 32 bit or 64 bit
file $ORACLE_HOME/bin/oracle
oracle: executable (RISC System/6000) or object module not stripped
SQL> SELECT Length(addr)*4 || '-bits' word_length FROM v$process WHERE ROWNUM =1;
WORD_LENGTH
---------------------------------------------
32-bits
file $ORACLE_HOME/bin/oracle
oracle: 64-비트 XCOFF 실행 파일 또는 오브젝트 모듈 스트립되지 않음
SQL> SELECT Length(addr)*4 || '-bits' word_length FROM v$process WHERE ROWNUM =1;
WORD_LENGTH
---------------------------------------------
64-bits