How to purge an already dropped table?

I dropped a table but didn't purge it. How can I purge it, so I can release the tablespace that the table uses?

PURGE TABLE test;

or

PURGE RECYCLEBIN;

From docs:


The following statement removes the table test from the recycle bin.
If more than one version of test resides in the recycle bin, Oracle
Database removes the version that has been there the longest:

PURGE TABLE test;

To determine system-generated name of the table you want removed from
your recycle bin, issue a SELECT statement on your recycle bin. Using
that object name, you can remove the table by issuing a statement
similar to the following statement. (The system-generated name will
differ from the one shown in the example.)

PURGE TABLE RB$33750$TABLE$0;

Remove the Contents of Your Recycle Bin:


Example To remove the entire contents of your recycle bin, issue
the following statement:

PURGE RECYCLEBIN;

http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9018.htm

StackExchange Database Administrators Q#122153, answer score: 4