64位：
SQL*Plus: Release 10.2.0.5.0 - Productionon Sun Sep 25 08:57:22 2011
Copyright (c) 1982, 2010, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise EditionRelease 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Miningand Real Application 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：
C:\Users\Administrator.DavidDai>sqlplus/ as sysdba;
SQL*Plus: Release 11.2.0.1.0 Production onSun Sep 25 08:55:48 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise EditionRelease 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Miningand Real Application Testing options
32位：
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------
Oracle Database 11g Enterprise EditionRelease 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for 32-bit Windows: Version 11.2.0.1.0- Production
NLSRTL Version 11.2.0.1.0 - Production
64位：
SQL> select * from v$version;
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise EditionRelease 10.2.0.5.0 - 64bi
PL/SQL Release 10.2.0.5.0 - Production
CORE 10.2.0.5.0 Production
TNS for Linux: Version 10.2.0.5.0 -Production
NLSRTL Version 10.2.0.5.0 – Production
和第一种方法一样，64位会显示具体的位数信息，32位不会显示。
32位：输出为8位16进制数
SQL> select address from v$sql whererownum<2;
ADDRESS
--------
B50ACCAC
64位：输出为16位16进制数
SQL> select address from v$sql whererownum<2;
ADDRESS
----------------
0000000196FDF7D8