Accounting is not working. Please help.

[alex]

Hey guys, i just follow this guide.
http://www.frontios.com/freeradius.html
and everything looks ok, the users are already working and login without problem.
But the accounting is not working, the mysql tables are empty, i checked when i user access and everything looks ok, and the radacct still empty.

In my radiusd.conf i have
accounting {
        detail
        radutmp
        sql
}
Other guy is checking in the AP, but i wanna be sure i have the correct values in the server.

Any  comment is appreciated.
Alex