syslog no data issue

[samuelronny]

Guys ,
I try to monitor the servers syslogs with syslogs plugins .But it fails to dislplay the logs in the web while it exists in the syslog_incoming table . And the cacti log shows that 'SYSTEM SYSLOG STATS:Time:0.1 Deletes:0 Incoming:0 Removes:0 XFers:22 Alerts:0 Alarms:0 Reports:0'
.The logs are put into a seperated database 'syslog' ,and I have already changed file 'config.php' as following:
$use_cacti_db = false;

if (!$use_cacti_db) {
$syslogdb_type = 'mysql';
$syslogdb_default = 'syslog';
$syslogdb_hostname = 'localhost';
$syslogdb_username = 'cacti';
$syslogdb_password = 'cacti';
$syslogdb_port = 3306;
So does anyone confronted with this issue before ? Thanks a lot !