A fix is available
APAR status
Closed as program error.
Error description
Poor SQL performance when range list access is used and PTF UI22717 is applied .
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of DB2 10 and DB2 11 for z/OS * * who have queries eligible for range list * * access and have PI15740 applied * * (UI22717 on DB2 10; UI22718 on DB2 11) * **************************************************************** * PROBLEM DESCRIPTION: Poor query performance can occur for a * * query using range list access when the * * query contains both BETWEEN and range * * predicates on the same column * **************************************************************** * RECOMMENDATION: * **************************************************************** Poor query performance can occur after PI15740 is applied for a query using range list access when the query contains both BETWEEN and range predicates on the same column. The range predicate can be chosen as the best matching predicate even when the BETWEEN predicate provides better filtering. The difference in predicates chosen as best-matching is not distinguishable from the PLAN_TABLE after an Explain. Additional Keywords: SQLPERFORMANCE SQLACCESSPATH RANGELIST SQLBETWEEN SQLLT SQLGT SQLLE SQLGE
Problem conclusion
DB2 code is updated to correct the selection of best matching predicates in the situation described above. This can lead to better query performance.
Temporary fix
Comments
APAR Information
APAR number
PI53169
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
A10
Status
CLOSED PER
PE
YesPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-11-25
Closed date
2016-01-30
Last modified date
2016-03-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI34917 UI34918
Modules/Macros
DSNXOGBM
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
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:
02 March 2016