Hi everyone,
I found that performance get worse as the size of a given table 
increases. I mean, for example Ive just run some scripts shown in 

http://www.potentialtech.com/wmoran/postgresql.php

I understand that those scripts are designed to see the behavior of postgresql under 
different filesystems. However, since them generate
a lot of I/O activity, I think they can be used to adjust some 
configuration parameters. In that way, I increased the number of tuples inserted in 
the initial table to 2000000 and 3000000. What 
I saw is that the running time goes from 3 min., to 11 min. My question is, is it 
possible to use that test to tune 
some parameters?, if the answer is yes, what parameters should I change to get shorter 
running times?

Thanks a lot

Nestor

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