"Database Time Spent Waiting (%)" alerts

Hi all,

I have noticed the following alert trace pattern, occurring at the top of every hour :

Metrics "Database Time Spent Waiting (%)" is at 0 for event class "Other"
Metrics "Database Time Spent Waiting (%)" is at 100 for event class "Other"

I have also noticed somewhat of a performance hit client-side, but what I would really like to know is what exactly do these alert levels, and occurring at this 0-100 pattern, mean ?

Thanks in advance,

Travis Weir

what is generating these messages?