Hi, I've made a benchmark comparing PostgreSQL, MySQL and Oracle under three environments: GNU/Linux-x86, Solaris-x86 (same machineas GNU/Linux) and Solaris-SPARC. I think you might find it interesting: http://blogs.nologin.es/slopez/archives/17-Benchmarking-Databases-I.-Volatile-Storage..html
pgsql-performance by date:
Соглашаюсь с условиями обработки персональных данных