A fix is available
APAR status
Closed as program error.
Error description
DB2 may choose an ineffective access path for the predicates referencing a column with frequency, histogram.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: DB2 for z/OS users with queries containing * * predicates on columns where frequency or * * histogram statistics have been collected. * **************************************************************** * PROBLEM DESCRIPTION: DB2 may choose an inefficient access * * path for query with predicates * * referencing a column or columns where * * frequency or histogram statistics have * * been collected. * **************************************************************** * RECOMMENDATION: * **************************************************************** DB2 may choose an inefficient access path for query with predicates referencing a column where frequency or histogram statistics have been collected. When the problem occurs, it might result in a poorly performing access path being selected by the optimizer.
Problem conclusion
The problems mentioned above are fixed so that DB2 will not give incorrect filter factor estimation in that situation. ADDITIONAL KEYWORDS: SQLACCESSPATH SQLPERFORMANCE
Temporary fix
Comments
APAR Information
APAR number
PM54681
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2011-12-20
Closed date
2012-01-13
Last modified date
2012-02-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK75450
Modules/Macros
DSNXODFB DSNXODFE DSNXODFR DSNXODFT DSNXODFX
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RA10 PSY UK75450
UP12/01/31 P F201
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 February 2012