Database Configuration Assistant (DBCA) in Oracle
reads the ORATAB file (/etc/oratab) to abatain the database list.
If no entries were found in /etc/oratab, then "Delete a Database" option would not be available (gray out).
Therefore, the entry can be added to /etc/oratab to delete a unused database.
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TESTDB: /u01/app/oracle/product/11.2.0/dbhome_1: N
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