I'm analyzing my database in order to understand where DB2 spends his time at the system level.
I have not created other user defined service class so I focused only on SYSDEFAULTUSERCLASS service class and I executed the following query:
select * from table(mon_get_service_subclass_details(null,null,n ull)) as s,
where (metric_name='TOTAL_RQST_TIME') OR (parent_metric_name='TOTAL_RQST_TIME')
According to the Figure 2 of the Hierarchy of time-spent monitor elements
each of the total_*_proc_time metric is part of the corresponding parent total_*_time metric.
You can see the difference using MON_FORMAT_XML_COMPONENT_TIMES_BY_ROW function.
So it seems that we should assume that
TOTAL_WAIT_TIME + TOTAL_*_TIME = TOTAL_RQST_TIME
But often there is a noticeable difference between this sum and total_rqst_time.
Probably those "Other[1|2]" are not so tiny...