Open Transaction Environment › Selecting the Right Options

Selecting the Right Options

The following list provides information that can help in selecting the right OTE options for CA Datacom CICS Services:

• Select the option OPENAPI=YES or NO in DBCVTPR and reassemble the macro. Consider the EXECKEY and the Concurrency value of the application programs for this selection.
• DBC request processing has Concurrency(Threadsafe) and EXECKEY=CICS. Therefore, DBC request processing starts processing on L8 TCBs if the DBCVTPR parameter is designated as OPENAPI=YES. If the DBCVTPR parameter is designated as OPENAPI=NO, execution begins on the same TCB where application is running when it is called. Give special attention to this selection as to prevent the degradation of performance by excessive TCB switching.
• Initially select applications that contain a mix of other resource managers in addition to CA Datacom/DB calls to run in OTE. Measure performance and modify as required to achieve the best throughput. In this case, the option of OPENAPI=YES should be tried in DBCVTPR for evaluating the overall performance since other resource managers may also run on L8 TCBs. Fully Threadsafe "application programs" have a better chance of achieving better performance with CA Datacom CICS Services in OTE, however that is not a requirement for selecting OPENAPI=YES. The fact that many open TCBs would be used in the OTE environment and the CA Datacom CICS Services can run on the open TCBs can greatly enhance the system performance.
• The MAXOPENTCBS system initialization parameter controls the number of CICS open TCBs permitted for this purpose. The necessary value would be set here to achieve maximum performance. For more information, see the CA Datacom CICS Services System Reference Guide.