postmaster freeze

Hello pgsql-general,

I have problem with my postgres server. I am running postgres
7.3.4 on RedHat9 (shrike) on dual processor machine.
Sometimes (cca 3 times per day) postmaster service will freeze
with 100% CPU load with SELECT statement (statement is never
finished). If I try the same action again without restarting
server, it works (but freezed postmasted still consume 100% CPU).
It seems that something in postgres is locked, because
if I run command vacuum when this situation happens,
psql will freeze too. I defined also statement_timeout=600000
(10 minutes) in config, but It seem does not work.

Did somebody have the same problem?
Please, help, this db is productive...

--
 Vladimir Drobny                          mailto:vladimir.drobny@vvexpert.sk