SAP Note 15606 - Overflow of dispatcher request queue

Symptom:

SysLog Q0H (error adding a request to the dispatcher queue).

Reason and Prerequisites

Usual cause: queue defined too small.

Solution
Check the value of profile parameter rdisp/elem_per_queue. If required, increase the value.

If the problem continues to occur: check the SysLog entry to find out which queue type is involved (DIA, VB, ENQ, BTC, SPO) and find the causes why the work processes for these types do not process the requests quickly enough or check why so many requests are generated.