A fix is available
APAR status
Closed as program error.
Error description
DB2 may select N access type instead of IN access type on V11, while the access path with IN access type performs better.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All users of DB2 11 for z/OS whose query * * contains more than one IN-list predicate. * **************************************************************** * PROBLEM DESCRIPTION: DB2 may not choose an efficient * * access path utilizing either access * * type 'N' or access type 'IN' when the * * query contains more than one IN-list * * predicate. * **************************************************************** * RECOMMENDATION: * **************************************************************** DB2 may not choose an efficient access path utilizing either access type 'N' or access type 'IN' when the query contains more than one IN-list predicate. For example, SELECT * FROM T1 WHERE C1 IN (?, ?) AND C2 IN (?, ?) AND C3 = ? AND C4 = ? If there is an index defined on T1(C1,C2,C3,C4) and the index is selected to access T1, the DB2 optimizer may choose 'N' access type with only 1 matching predicate instead of an access path using 'IN' access type with 4 matching predicates. Additional Keywords: SQLACCESSPATH SQLPERFORMANCE SQLIN
Problem conclusion
The DB2 optimizer is enhanced to choose the number of matching predicates based on cost estimation when there are multiple IN list predicates that can be matching.
Temporary fix
Comments
APAR Information
APAR number
PI23765
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
2014-08-13
Closed date
2014-10-31
Last modified date
2014-12-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI22692
Modules/Macros
DSNXOGBM
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RB10 PSY UI22692
UP14/11/18 P F411
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.
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEPEK","label":"Db2 for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
06 May 2020