To Find Oracle Server bit (32 or 64bit server)

Method 1) sqlplus “/as sysdba”-> Verify the bit in the banner message of SQLPLUS OR “select banner from v$version;”

Method 2)  $ cd $ORACLE_HOME/bin
                     $ file oracle
                                OR
                     $ file `which oracle`

Method 3) Check for folders “lib” / “lib32” in Oracle Home
                    If lib alone present then its 32 bit
                    If lib32 and lib both are present then its 64 bit