[syslog-ng] clearing /var/log/syslog file - its becoming bigger

Hi Guys, I installed syslog-ng and php-syslog-ng. As what I know, php-syslog-ng will get all logs files in /varlog/syslog file to mysql db. Is it possible to clear /var/log/syslog file because its getting bigger? Since all logs are been copied to the db, is it safe to clear syslog? Is this possible? Thanks! cheers, janskey