Removing Your Oracle Database
The task of removing an Oracle database differs based on what OS you are running on. For example, if you are running on UNIX, generally you must remove the related database files (database data files, online redo logs, and control files), files in the admin directories related to the database (database parameter files, trace files, etc.), and entries in ancillary database files such as the oratab, tnsnames.ora, and listener.ora files. If you are running on Windows, you need to make the same changes required on UNIX systems, but you also need to remove the database services for the database that you are removing. This will prevent errors from occurring when you start your Oracle database.
You can also use the DBCA to remove a database. The DBCA can be used to drop a database that you created with the DBCA or one that you manually created.
Oracle Database 10g offers a new command, drop database, that takes care of dropping your database for you. You still need to perform ancillary tasks, such as removing the database service and changing database files such as oratab, tnsnames.ora, and listener.ora.
Removing an Oracle database is quite different than removing the Oracle database software. If removing the software is your quest, you should first remove all Oracle databases on your system, and then use the Oracle Universal Installer to remove the Oracle RDBMS software. To completely remove the Oracle RDBMS software, you will probably have to manually remove files from the old ORACLE_HOME, as the installer is not always perfect in its removal process.
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