Limit watchdog table in size?

Hi, is it possible to limit the _size_ of the watchdog table other than the time limit (delete entries older than 1h/3h/1d etc.)?

A crashed cache table filled up my watchdog table with loads of "Table cache s marked as crashed and should be repaired" messages. Actually full 3 GB worth of these messages until out provider shut us down.

Puzzled
Markus