Manually uninstall Oracle Database 11gR2 using the command line

You can use the command line to manually uninstall Oracle Database 11gR2. One is to use DBCA to automatically uninstall the Oracle Database, and the other is to manually uninstall the Oracle Database using the command. The following describes the procedure of the second method: 1. log on to the database as sysdba $ sqlplus/as sysdba 2. make the database in the mount status SQL> select open_mode from v $ database; check the open_mode status. If it is not "mount", run the following command: SQL> shutdown immediate; SQL> startup mount; 3. enable restricted session mode SQL> alter system enable restricted session; 4. delete database SQL> drop database; Note: 1. the database must be closed. 2. the restricted session mode must be enabled for the database. command Line drop database will delete Oracle database files (control, redo, datafile, SPFILE) 4. archivelog and rman backup files can be deleted by running the rman command. the command line drop database does not delete any data files on raw disk. You need to manually delete 6. instance registration (/etc/oratab) needs to be manually deleted