A fix is available
APAR status
Closed as program error.
Error description
REORG spends a very long time in the Log Iteration and causes timeout in the application transactions.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All Db2 11 for z/OS and Db2 12 for z/OS * * users of REORG SHRLEVEL CHANGE or REFERENCE * * utility * **************************************************************** * PROBLEM DESCRIPTION: * * Extended duration of REORG last log * * iteration resulted in application * * timeout * **************************************************************** * RECOMMENDATION: * * Apply corrective PTF when available * **************************************************************** During a REORG execution with log phase processing, the utility decided to break-in on the very first major log iteration in the LOG phase. However, due to the short elapsed time of the REORG job to the start of the LOG phase, coupled with a high volume of log records generated in the same period of time, REORG was not able to process the last log iteration within the effective MAXRO value and subsequently caused concurrent applications to timeout due to the extended outage. The reported problem was caused by inaccurate and missing historical iteration statistics for REORG to correctly estimate the projected elapsed time of the very first major log iteration. This problem can happen for REORG SHRLEVEL CHANGE as well as REORG TABLESPACE PART SHRLEVEL REFERENCE execution when there is a LOG phase. Additional keywords: RC00C900BA DSNT500I SQLCODE-911
Problem conclusion
Code has been modified to alleviate the aforementioned scenario by ensuring REORG does not begin the last read-only iteration when it is the very first major log iteration.
Temporary fix
Comments
APAR Information
APAR number
PH19594
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
B10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-11-24
Closed date
2020-04-15
Last modified date
2020-05-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI69028 UI69030
Modules/Macros
DSNURLOG
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
Fix is available
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Document Information
Modified date:
04 May 2020