import performance

Hi all,

I'm trying to work out why my 8.1 system is slower than my 7.4 system
for importing data.

The import is a lot of "insert into" commands - it's a converted
database from another system so I can't change it to copy commands.


My uncommented config options:


autovacuum = off

bgwriter_all_maxpages = 15
bgwriter_all_percent = 10.0
bgwriter_delay = 2000
bgwriter_lru_maxpages = 10
bgwriter_lru_percent = 5.0

checkpoint_segments = 10

commit_delay = 100000
commit_siblings = 500

temp_buffers = 500

wal_buffers = 16

max_connections = 16

shared_buffers = 256


(I was playing around with the bgwriter stuff to see if it made any
differences, so I could be making it worse).

It's a pretty small machine - 2.6GHz with 512M RAM.

My main concern is 7.4 on a smaller machine with less memory is faster
to import this data.


Suggestions on what I need to do would be fantastic, thanks!

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