pg_log

Hi my name is Sylvain
I use Postgres 6.5.3-3
Why is the pg_log???

I have a program than run 24hrs/day and many transaction has been send
to postgres
eg (select, insert, update, vacuum, (begin work-commit work)...)

At begin, with a new database the pg_log are 40k
After many days my pg_log is come 3884k

It's possible to initialize it? If yes how...
It's possible to do anything to don't pg_log come bigger and bigger...

thanks a lots in advance for your help
Sylvain
sylvain@luxolith.com