Oracle Database Discussions

I have a large long running (1 hour) data warehouse query in a materialized view.
If I parallelize it using the parallel hint then I run out of temporary tablespace.
I've tried creating a bunch of temporary tablespaces and putting them into a temp tablespace group but it still runs out of space. Parallel execution seems to use up way more temp tablespace than sequential execution.

I know it is a very general question, but what are the tips for parallelizing a long running query with respect to temporary tablespace management?
I've tried searching on the interwebs but I don't find anything that addresses this particular issue.