A Closer Look at How to Set up a Parsing-Only Workload - comment by carrie

Roberto,
 
There is no "default"  workload for just parsing.   Parsing will happen at the same workload that the session's logon uses.   Depending on the number of workloads defined and their characteristics, it is likely that there will be different workloads selected for parsing across different applictions.  But it is possible parsing could be centralized on on or just a few workloads.  Look at the SessionWDID in DBQLogTbl to validate where parsing took place.
Parsing will only happen in H-WD for a query if the session had an account string that started with $H and there were no other workloads at  a higher priority that the session information could have matched to.
 
Thanks, -Carrie