今天有时间对“ORACLE_HOME”环境变量进行了如下测试：
[oracle@linux ~]$ export ORACLE_HOME=/u01/app/oracle//product/10.2/db_1
[oracle@linux ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.3.0 - Production on Mon Jun 1 13:13:07 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to an idle instance.
SQL> Disconnected
[oracle@linux ~]$ export ORACLE_HOME=//u01/app/oracle/product/10.2/db_1
[oracle@linux ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.3.0 - Production on Mon Jun 1 13:13:18 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to an idle instance.
SQL> Disconnected
[oracle@linux ~]$ export ORACLE_HOME=/u01/app/oracle/product/10.2/db_1/
[oracle@linux ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.3.0 - Production on Mon Jun 1 13:13:31 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to an idle instance.
SQL> Disconnected
[oracle@linux ~]$ export ORACLE_HOME=/u01/app/oracle/product/10.2/db_1
[oracle@linux ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.3.0 - Production on Mon Jun 1 13:13:42 2009
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning and Data Mining options
SQL>
测试结果显示，ORACLE_HOME环境变量中对“/”符号要求严格，不能在该字符串变量的值中出现多余“/”符号（虽然这样写在linux下是合法的），否则可能引起连接数据库异常。对于初学者需要提高警惕