deleting a database

(repost)

How do I delete a database in Oracle?

I posted this question recently, but replies wondered if I knew what 'database' means in Oracle.

I've created several databases using the 'create a database' option in Oracle Database Configuration Assistant. Now I want to delete them. I've tried using the 'delete a database' option, but it doesn't work. The folder for the database is still taking up disk space in oracle/oradata and the database is still in the tree in Oracle DBA Studio, although it seems to be inaccessible.

How do I get rid of unwanted databases completely?

(I'm using Oracle 8i Personal Edition on WinXP)

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