A fix is available
APAR status
Closed as program error.
Error description
A Range list access path could be chosen when a more efficient access path is available. Additional symptoms and search keywords: SQLPERFORMANCE SQLACCESSPATH SQLRANGELIST
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: DB2 11 for z/OS users who have a query with * * OR predicates that can map to a single * * index. * **************************************************************** * PROBLEM DESCRIPTION: DB2 may favor range list index scan * * with data page access over index access * * when the index access plan is more * * efficient but with higher uncertainty. * **************************************************************** * RECOMMENDATION: * **************************************************************** DB2 may favor range list index scan with data page access over index access when the index access plan is more efficient but with higher uncertainty. For example, SELECT C4 FROM T1 WHERE C1 > ? AND (C2 > ? OR (C2 = ? AND C3 > ?)) If an index IX1 is defined on (C1) and another index IX2 is defined on (C2, C3), DB2 may favor a range list index scan using IX1 even though an index access using IX2 is more efficient. Additional Keywords: SQLACCESSPATH SQLPERFORMANCE SQLRANGELIST SQLOR
Problem conclusion
Code has been modified to solve the problem described as above. DB2 will not favor range list index scan with data page access over index access when the index access plan is more efficient but with higher uncertainty.
Temporary fix
Comments
APAR Information
APAR number
PI64234
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
2016-06-15
Closed date
2016-09-06
Last modified date
2016-10-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI40644
Modules/Macros
DSNXOCSC
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RB10 PSY UI40644
UP16/09/21 P F609
Fix is available
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Document Information
Modified date:
03 October 2016