Shrinking PGA of snp processes

I noticed some of the snp processes take a LOT of memory, probably their PGA
grows to accommodate the largest nightly jobs.

Looks like the PGA never shrinks back down, is there a way to force
processes to release PGA memory once they're done using it (in 8i -- we're
upgrading soon)?

Other than setting a lower sort_area_size.

Patrice. 
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