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If you are using 10g then use the Database Clone feature. You can access this via the "Database Control" console. Go to the "Maintenance" page for the database you want to clone and select "Clone Database."
You can also use the RMAN duplicate command to clone a database.
Or you can take a cold/hot backup and restore it manually.
If you are unsure then I suggest you take a look at Metalink for the full set of procedures.
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