Alex Turner wrote:
I am also very interesting in this very question.. Is there any way
to declare a persistant cursor that remains open between pg sessions?

Not sure how this would work. What do you do with multiple connections? Only one can access the cursor, so which should it be?

 This would be better than a temp table because you would not have to
 do the initial select and insert into a fresh table and incur those
IO costs, which are often very heavy, and the reason why one would
want to use a cursor.

I'm pretty sure two things mean there's less difference than you might expect:
1. Temp tables don't fsync
2. A cursor will spill to disk beyond a certain size

  Richard Huxton
  Archonet Ltd

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