A fix is available
APAR status
Closed as program error.
Error description
ABEND04E RC00E2000C DSNXECT DSNSVSVB +0AB6 OFFSET0AB6 when parallelism is enabled .
Local fix
Disable parallelism eg. SET CURRENT DEGREE = '1'.
Problem summary
**************************************************************** * USERS AFFECTED: All DB2 11 for z/OS users who run complex * * queries on a high degree of parallelism. * **************************************************************** * PROBLEM DESCRIPTION: An ABEND04E RC00E2000C at DSNXECT. * * DSNSVSVB +0AB6 OFFSET0AB6 when a very * * complex query (more than 10 combined of * * UNION/UNION ALL/INTERSECT/INTERSECT * * ALL/EXCEPT/EXCEPT ALL legs in the * * query) runs on high degree of * * parallelism. * **************************************************************** * RECOMMENDATION: * **************************************************************** An ABEND04E RC00E2000C at DSNXECT.DSNSVSVB +0AB6 OFFSET0AB6 when a very complex query (more than 10 combined UNION/UNION ALL/ INTERSECT/INTERSECT ALL/EXCEPT/EXCEPT ALL legs in the query) runs on high degree of parallelism. When a DB2 system executing such high degree of parallelism for each UNION/UNION ALL/INTERSECT/INTERSECT ALL/EXCEPT/EXCEPT ALL leg, eventually, those parallel child tasks consume all the available system storage/memory before the complex query finishes and forces the storage manager abends when no more physical storage/memory is available to keep up with the demand. There may be other failing symptoms at different locations.
Problem conclusion
DB2 has been modified to reduce the number of parallel child tasks for every parallel group when such complex query is detected to reduce the system storage/memory usage. Additional Keywords: PARALLELISM SQLPARALLELISM DB2PARALL/K SQLUNION SQLUNIONALL SQLINTERSECT SQLINTERSECTALL SQLEXCEPT SQLEXCEPTALL SQLSTORAGE DB2STGLK/K
Temporary fix
Comments
APAR Information
APAR number
PI31442
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
2014-12-11
Closed date
2015-04-17
Last modified date
2015-06-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI26835
Modules/Macros
DSNXOGP DSNXOLCM DSNXOLDE DSNXOLM1 DSNXOMPS DSNXRSTP DSNXRSTS
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RB10 PSY UI26835
UP15/05/02 P F505
Fix is available
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Document Information
Modified date:
06 May 2020