Occurs when a request for a lock times out because of a blocking lock that is being held by a different resource. This event ...

Occurs when a request for a lock times out because of a blocking lock that is being held by a different resource. This event is identical to lock_timeout, but excludes cases in which the time-out value is 0, such as when lock probes are used. Time-outs with a duration of 0 do not necessarily indicate a blocking problem.