MauMau, 10.05.2012 13:34:
Today, they told me that they ran the test on two virtual machines on a single physical machine.
Which means that both databases shared the same I/O system (harddisks). Thererfor it's not really surprising that the overall performance goes down if you increase the I/O load. A more realistic test (at least in my opinion) would have been to have two separate computers with two separate I/O systems -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
