Does anyone know why sql doesnt have a recorded last batch time for some spids? 
select spid,last_batch from master..sysprocesses
will once in a while report results like this...
307  1900-01-01 00:00:00.000 
238  2006-04-27 15:49:08.333 
192  2006-04-28 06:48:05.477 
the transactions usually complete without error, but I was curious to know why this happens or if its indicative of a real problem.