Fixes are available
APAR status
Closed as program error.
Error description
When a query has always-false predicates or EXISTS predicates, we may get wrong results. More specifically, we may get more rows returned than anticipated. Another example with always-false predicates: create table t1 (c1 int); create table t2 (c1 int); insert into t1 values (5); insert into t2 values (5), (5); -- Bad query with "always false" predicate, should return 1 row, returns 2 select * from t1 where ((t1.c1 < 1 and t1.c1 > 2 ) -- Always false predicate or (exists(select * from t2 where t2.c1=t1.c1))); C1 ----------- 5 5 2 record(s) selected. -- Same query without "always false" predicate, correctly returns 1 row select * from t1 where exists(select * from t2 where t2.c1=t1.c1); C1 ----------- 5 1 record(s) selected.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to Db2 version 11.1.4.6 * ****************************************************************
Problem conclusion
Fixed in Db2 version 11.1.4.6
Temporary fix
Comments
APAR Information
APAR number
IT35118
Reported component name
DB2 FOR LUW
Reported component ID
DB2FORLUW
Reported release
B10
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-12-01
Closed date
2021-03-16
Last modified date
2021-03-29
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
DB2 FOR LUW
Fixed component ID
DB2FORLUW
Applicable component levels
RB10 PSN
UP
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
04 May 2022