> I guess I was wondering if there is other general tuning advice for such
> large table indexes such as increasing statistics, etc.

Well, your index use problem is being explained by Tom, Stephan and Simon; 
basically your FKed data types are incompatible for index use purposes so the 
system *can't* use an index while loading.

If you're going with the drop/load/recreate option, then I'd suggest 
increasing work_mem for the duration.  Hmmm ... or maintenance_work_mem?  
What gets used for FK checks?  Simon?

Josh Berkus
Aglio Database Solutions
San Francisco

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