Freeradius 3.0.4 - CentOS7 - no SQL log will be create

Hello, When i activate the SQL log, still no log file is created. Am I doing something wrong or is it a bug? The following parameters are active logfile = /var/log/radius/sqllog.SQL driver = "rlm_sql_mysql" and is test logfile = /var/log/radius/sqllog.SQL driver = "rlm_sql_null" but with the second Settings i get a reject from the SQL Server. With the first all works fine, but no log was created. Regardes Andre