如何卸载APEX

To remove Oracle Application Express from the database:

1. Change your working directory to the apex directory where you unzipped the Oracle Application Express software.

2. Start SQL*Plus and connect to the database where Oracle Application Express is installed as SYS specifying the SYSDBA role:

   • On Windows:

     SYSTEM_DRIVE:\ sqlplus /nologSQL> SQL> CONNECT SYS as SYSDBAEnter password: SYS_password

   • On UNIX and Linux:

     $ sqlplus /nologSQL> SQL> CONNECT SYS as SYSDBAEnter password: SYS_password

3. Execute the following command:

   SQL> @apxremov.sql

参考：http://docs.oracle.com/cd/E17556_01/doc/install.40/e15513/trouble.htm#BABDJIFE