Процедура удаления Oracle описана ниже.
1. remove all database, by running $dbca
2. stop any oracle process running:
Database Control : $ORACLE_HOME/bin/emctl stop dbconsole
Oracle Net listener : $ORACLE_HOME/bin/lsnrctl stop
iSQL*Plus : $ORACLE_HOME/bin/isqlplusctl stop
Ultra Search : $ORACLE_HOME/bin/searchctl stop
3. Start Oracle Universal installer:
$ORACLE_HOME/oui/bin/runInstaller
4. In the Welcome window, click Deinstall Products.
5. In the Inventory screen, select the Oracle home and the products that you want to remove,
then click Remove.