Segregating Datacom data buffers by individual DBID

Products

• Datacom
• Datacom/DB
• Datacom/AD

Issue/Introduction

This article explains how overall Datacom Multi-User (MUF) performance can be increased by using adequate buffer allocations per database-id (DBID) to protect business critical DBIDs from other MUF buffer users.

Environment

z/OS

 

Resolution

Define alternate buffer pools to be assigned to specific DBIDs or areas. Alternate buffer pools are defined with the MUF startup option BUFFER_POOL_DEF. See MUF Startup Options member DBDATIN2/AXDATIN2 which has some sample statements commented out: 

*BUFFER_POOL_DEF IXX01,4,15 POOL-NAME,BUFFER-SIZE,BUFFER-COUNT 
*BUFFER_POOL_DEF DXX01,4,15 POOL-NAME,BUFFER-SIZE,BUFFER-COUNT 
*BUFFER_POOL_DEF DATA1,4,15 POOL-NAME,BUFFER-SIZE,BUFFER-COUNT 

Then assign an area or DBID to the pool with the BUFFER_POOL_CONTENT startup option, for example: BUFFER_POOL_CONTENT DATA1,22 

MUF console commands BUFFER_POOL_CONTENT and BUFFER_POOL_COUNT can be used to make changes to the buffer configuration. 

Additional Information

For further information, please see BUFFER_POOL_DEF and BUFFER_POOL_CONTENT.