Improving DBCTL performance

You can tune your CICS®-DBCTL setup to make efficient use of resources to help you reach performance objectives.

Performance parameters in CICS
System design considerations for CICS with DBCTL are similar to the design considerations that applied to local DL/I. For example, do not allow excessive database accesses or updates in a single UOW. However, some system design considerations are specific to CICS with DBCTL.
Performance parameters in IMS
From an IMS point of view, tuning DBCTL is much like tuning an IMS system.
Using DEDBs
Using DEDBs can provide performance improvements in a number of areas, including a reduction in path length, parallel processing capability, less I/O processing, and a reduced logging overhead.
IMS asynchronous database buffer purge facility
IMS includes the asynchronous database buffer purge facility.
Virtual storage usage
CICS regions that previously used local DL/I can obtain considerable virtual storage constraint relief because the following storage areas reside in the DBCTL address spaces: all DL/I and DBRC code and control blocks, OSAM and VSAM buffer pools and related control blocks, PSB, DMB, and ENQ pools.
Improved throughput on multiprocessors
You can obtain throughput improvements on multiprocessors when using IMS Version 12 or later by using the CICS open transaction environment (OTE), providing that the application code is threadsafe.

Parent topic: Improving performance

Related information

Monitoring IMS
Data available for a CICS-DBCTL system
Monitoring DBCTL: transaction level data