Real storage performance checklist

Note:

Adequate central and expanded storage is vital to achieving good performance with CICS®.

Item Topic
MVS™ considerations
Make CICS nonswappable Making CICS nonswappable
Move CICS code to the LPA/ELPA Using modules in the link pack area (LPA/ELPA)
   
VSAM considerations
Review the use of Hiperspace™ buffers Using Hiperspace buffers
Use VSAM LSR where possible Using VSAM local shared resources (LSR)
Review the number of VSAM buffers Defining VSAM buffer allocations for NSR (INDEXBUFFERS and DATABUFFERS)
Review the number of VSAM strings Defining VSAM string settings for NSR (STRINGS)
   
Task control considerations
Adjust maximum tasks (MXT) Setting the maximum task specification (MXT)
Control certain tasks by transaction class Using transaction classes (MAXACTIVE) to control transactions
   
MRO/ISC considerations
Implement MVS cross-memory services with MRO CICS intercommunication facilities and performance: overview
Implement MVS cross-memory services with shared database programs
Use CICS intercommunication facilities CICS intercommunication facilities and performance: overview
   
Database considerations
Replace DL/I function shipping with IMS™ DBCTL facility Setting DBCTL minimum threads (MINTHRD)
Review use of DB2® buffers and threads Tuning the CICS DB2 attachment facility: Introduction
   
Temporary storage and transient data
Reduce temporary storage strings or buffers Tuning the use of CICS temporary storage (TS)
Reduce transient data strings or buffers Optimizing the performance of the CICS transient data (TD) facility
   
Journaling
   
Increase activity keypoint frequency (AKPFREQ) value Setting the activity keypoint frequency (AKPFREQ)
   
Terminal, VTAM® and SNA
Reduce terminal scan delay Adjusting the terminal scan delay (ICVTSD)
Reduce concurrent VTAM inputs Setting the size of the receive-any pool (RAPOOL)
Reduce VTAM input message size Setting the size of receive-any input areas (RAMAX)
Prioritize transactions Prioritizing tasks
Reduce concurrent VTAM logon/logoffs Limiting the number of concurrent logon/logoff requests (OPNDLIM)
   
Applications
Use PL/I shared library facilities Using the PL/I shared library
   
Miscellaneous
Decrease region exit interval Tuning the region exit interval (ICV)
Reduce trace table size CICS trace: performance considerations
Use only required CICS recovery facilities CICS recovery: performance considerations

Related tasks
Performance checklists
Input/output contention performance checklist
Virtual storage above and below 16MB line performance checklist
Processor cycles performance checklist
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