At 01:58 PM 12/2/2005, Rick Schumeyer wrote:
I installed another drive in my linux pc in an attempt to improve performance
on a large COPY to a table with a geometry index.
Based on previous discussion, it seems there are three things
competing for the hard drive:
1) the input data file
2) the pg table
3) the WAL
What is the best way to distribute these among two drives? From
Tom's comments
I would think that the pg table and the WAL should be
separate. Does it matter where the input data is?
Best is to have 3 HD or HD sets, one for each of the above.
With only 2, and assuming the input file is too large to fit
completely into RAM at once, I'd test to see whether:
a= input on one + pg table & WAL on the other, or
b= WAL on one + pg table & input file on the other
is best.
If the input file can be made 100% RAM resident, then use
c= pg table on one + WAL and input file on the other.
The big goal here is to minimize HD head seeks.
Ron
