SORT_AREA_SIZE question

Hello,
 

I joined this list last week, so I apologize in advance if I'm asking a question that has previously been answered.
 

I am responsible for a reporting database/data mart that is approximately 175 GB.  Our main fact table ranges from 1-14 GB depending upon how far along we are into our financial year.  I have large reports that run full table scans on this table daily.  In an effort to keep as much of the sorting in memory as possible I have specified SORT_AREA_SIZE to be 100MB.  Some of the tuning books I am reading now are making me second-guess myself and I am wondering if this is overkill.
 

Can anyone provide some advice on how large they are setting their SORT_AREA_SIZE values for their DSS systems? 
 

Thanks in advance,
 

Bart
 

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