This is a command that will create log files for different events occurring on your server. The logs are stored to WEBMASTER/DB/CRACCESS.LOG and you will need to shut down the server to open the logs.
0 = Log nothing
1 = Log local clients
2 = Log local errors
3 = Log local clients and local errors
/as security set loglevel 2
Logs can be useful if your server goes down, to see what was happening just before it stopped running.