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Can I flush the Undo tablespace by any chance... ?


You don't need to flush any thing from the undo tablespace. It will reuse the undo data automatically.

You can create a new undo tablespace and make it active for your database. Later on drop your old undo tablespace.

UNDO_RETENTION time undo tablespace is filled and any query fails, then if another query is going to do a DML and tries to use UNDO segments then, I think that will also fail because of unavailability of UNDO SEGMENTS..

> create undo tablespace undotbl_new datafile size 1m;
Tablespace created.

> alter system set undo_tablespace = undotbl_new scope=both;
System altered.

> drop tablespace undotbs;
Tablespace dropped.

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