A fix is available
APAR status
Closed as program error.
Error description
DB2 may choose an inefficient access path for the predicates referencing a column with frequency, histogram statistic, and the predicates are range predicates or predicates with subquery( the subquery is not in subquery)
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 when a user issues a query with a * * predicate or predicates that satisfy * * the conditions below: * * * * 1. The predicate refers to a column or * * columns where frequency or histogram * * statistics have been collected. * * 2. The predicate is a range predicate * * with parameter marker (or parameter * * markers) or host variable (or host * * variables) , or the predicate refers * * to a subquery (except an EQUAL or * * NOT EQUAL subquery). * **************************************************************** * RECOMMENDATION: * **************************************************************** DB2 may choose an inefficient access path for a query with a predicate or predicates referencing a column where frequency or histogram statistics have been collected. The predicate or predicates are range predicates with parameter markers or host variables, or include subuqueries (except EQUAL or NOT EQUAL subqueries).
Problem conclusion
The problems mentioned above are fixed so that DB2 will choose a more efficient access path in that situation. ADDITIONAL KEYWORDS: SQLACCESSPATH SQLPERFORMANCE SQLBETWEEN SQLSUBQUERY SQLPMK PARAMETERMARKER SQLPMARKER SQLHOSTVAR SQLLT SQLGT
Temporary fix
Comments
APAR Information
APAR number
PM74991
Reported component name
DB2 OS/390 & Z/
Reported component ID
5740XYR00
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-10-15
Closed date
2012-12-19
Last modified date
2013-02-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK90518
Modules/Macros
DSNXODFB DSNXODFR DSNXODFT
Fix information
Fixed component name
DB2 OS/390 & Z/
Fixed component ID
5740XYR00
Applicable component levels
RA10 PSY UK90518
UP13/01/04 P F301
Fix is available
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Document Information
Modified date:
04 February 2013