The SESAM/SQL DBH normally processes requests with varying BS2000 priorities in the order in which they are received. System administrators can modify this approach by enabling priority control with the DBH option REQUEST-CONTROL when they start the independent DBH. Priority control is unavailable in connection with the linked-in DBH.
Priority classes and weights
Using the independent DBH's priority control capability, it is possible to relativize BS2000 priorities for requests and to adapt them to the requirements of the DBH session. To do this, system administrators divide the full range of BS2000 priorities (priorities 30 through 255) into three priority classes. By assigning a weight to each priority class, they can control the processing sequence for requests in the different priority class in accordance with requirements.
Intervention in operations
If necessary, system administrators can intervene in and tune priority control during the current session with the aid of different administration statements (see section “Administration statements and commands”).