A fix is available
APAR status
Closed as program error.
Error description
When INSERT transaction running parallel using Insert Algorithm 2 in a data sharing environment, there is timing window that transaction can referencing down level space map page without page latch. As a result, insert can encounter various forms of data corruption detection abends. Additional symptoms: ERQUAL5001 DSNKINSL 5033 ERQUAL5033 00C90207 DSNIOW 5003 ERQUAL5003 DB2IAG2/K
Local fix
Disable IAG2 - DEFAULT_INSERT_ALGORITHM With PH02052/UI61453 applied, then the -SET SYSPARM command will support the online change of DSN6SPRM.DEFAULT_INSERT_ALGORITHM
Problem summary
**************************************************************** * USERS AFFECTED: * * Db2 12 for z/OS using Insert Algorithm 2 * * (IAG2) with tables defined with APPEND * * NO attribute. * **************************************************************** * PROBLEM DESCRIPTION: * * When inserting into a table defined * * as APPEND NO and Insert Algorithm 2 * * (IAG2) is used, the following errors * * were encountered: * * * * 1. ABEND04E RC00C90101 AT DSNIDM. * * DSNISFPI:5001 * * 2. ABEND04E RC00C90101 AT DSNIDM. * * DSNKINSL:5033 * * 3. ABEND04E RC00C90207 AT DSNIDM. * * DSNIOW:5003 * **************************************************************** * RECOMMENDATION: * * Apply corrective PTF when available * **************************************************************** When insert or load data into a table defined with APPEND NO, using Insert Algorithm 2 (IAG2), Db2 scanned all existing space map pages to fill a set of pipes with available data pages. When this process was completed, the space map page was unlatched, and the write intent was released on the page. However, the internal control flag indicating the write intent status of the space map page was still held, as a result, the subsequent process got the down-leveled space map page without refreshing it from the buffer pool. This caused various Db2 abends (mentioned in Problem Description section).
Problem conclusion
Data Manager module is modified to reset the flag indicating that no write intent of the space map page after it is unlatched.
Temporary fix
Comments
APAR Information
APAR number
PH14585
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
C10
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-07-16
Closed date
2019-08-09
Last modified date
2020-07-21
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI64682
Modules/Macros
DSNISFAS DSNISFRO
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RC10 PSY UI64682
UP19/08/27 P F908
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
22 July 2020