A fix is available
APAR status
Closed as program error.
Error description
VSAM dynamic buffer addition (DBA). In z/OS 2.2 DFSMS VSAM introduced Dynamic Buffer addition (DBA) capability for LSR pools. The goal was to avoid failing a request due to buffer shortages. The solution was to add buffers to LSR pool as needed. The particular scenario targeted was upgrade set problems, due to running out of buffers half way through, having updated the AIX but not the base. If DBA is active VSAM produces a new message when buffers are added IDA9990I VSAM DBA ADDED xxxxDATA|INDEX BUFFERS of yyyyyBYTES EACH TO SHRPOOL zzzBECAUSE THERE WERE INSUFFICIENT BUFFERS TO PROCESS THE REQUEST. RECOMMENDATION: FOR PERFORMANCE, REBUILD THE SHARED POOL WITH AN INCREASE IN SIZE. The problem with DBA is that it decides how many buffers to add based on the string number and will add a significant number of buffers. These are added permanently and not deleted. Production of this new message and the addition of buffers is causing concern and generating PMRs from customers. There is no way for the user to turn off DBA.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All CICS users. * **************************************************************** * PROBLEM DESCRIPTION: Disable VSAM Dynamic Buffer Addition * * for CICS LSRPOOLs. * **************************************************************** VSAM Dynamic Buffer Addition ( DBA ) causes too many buffers to be added for CICS LSRPOOLs. DBA is not a substitute for well tuned LSRPOOLs.
Problem conclusion
CICS File Control has been changed to specify DBA=NO on the BLDVRP macros issued to build LSRPOOLs to disable Dynamic Buffer Addition.
Temporary fix
Comments
APAR Information
APAR number
PI92486
Reported component name
CICS TS Z/OS V5
Reported component ID
5655Y0400
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-01-16
Closed date
2018-02-06
Last modified date
2018-03-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI53678 UI53679 UI53680 UI53681
Modules/Macros
DFHFCL
Fix information
Fixed component name
CICS TS Z/OS V5
Fixed component ID
5655Y0400
Applicable component levels
R000 PSY UI53681
UP18/02/07 P F802
R100 PSY UI53680
UP18/02/07 P F802
R800 PSY UI53678
UP18/02/07 P F802
R900 PSY UI53679
UP18/02/08 P F802
Fix is available
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Document Information
Modified date:
01 March 2018