方法一：使用sqlplus

###64位：
[oracle@db01 ~]$ sqlplus / as sysdba
 
SQL*Plus: Release 11.2.0.3.0 Production on Fri Oct 318:44:05 2014
 
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
 
Connected to:
Oracle Database 11g Enterprise Edition Release11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and RealApplication Testing options
 
SQL> 
如果是64位，用sqlplus 连上之后会显示具体的位数信息，32位则不会显示。
 
 
###32位：
[oracle@db01 ~]$sqlplus/ as sysdba;
 
SQL*Plus: Release 11.2.0.1.0 Production onSun Sep 2508:55:48 2011
 
Copyright (c) 1982, 2010, Oracle.  All rightsreserved.
 
Connected to:
Oracle Database 11g Enterprise EditionRelease11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Miningand RealApplication Testing options

方法二：查看v$version 视图

###32位：
SQL> select * from v$version;
 
BANNER
--------------------------------------------------------------------------
Oracle Database 11g Enterprise EditionRelease11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE   11.2.0.1.0     Production
TNS for 32-bit Windows: Version 11.2.0.1.0- Production
NLSRTL Version 11.2.0.1.0 - Production
 
###64位：
SQL> select * from v$version;
 
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE   11.2.0.3.0      Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 – Production

方法三：查看v$sql 视图

###32位：输出为8位16进制数
SQL> select address from v$sql whererownum<2;
 
ADDRESS
--------
B50ACDAE
 
###64位：输出为16位16进制数
SQL> select address from v$sql whererownum<2;
 
ADDRESS
----------------
00000000C18D79C8

查看Oracle 32位还是64位(x86 or x64)