A fix is available
APAR status
Closed as program error.
Error description
DB2 may return SQL0901N when executing a query involving an expression index on a COALESCE function DB2 may produce -901 error with "nljn LOJ inner not nullable" when the following conditions are satisfied: 1. Query involves an outer join. 2. The inner table has an expression index or function based index defined on it. And the expression index is created on a COALESCE function (or NVL and VALUE functions). 3. DB2 Optimizer has chosen an access plan using the expression index to scan the inner table and a nested loop join to perform the outer join. For example: CREATE TABLE outer901 (COL1 DATE NOT NULL) ORGANIZE BY ROW; CREATE TABLE inner901 (DAT DATE NULL) ORGANIZE BY ROW; CREATE INDEX IOE ON inner901(COALESCE(DAT, DATE('9999-12-31')) ASC); SELECT COALESCE(B.DAT, '9999-12-31') FROM outer901 V LEFT OUTER JOIN inner901 B ON CURRENT_DATE = COALESCE(B.DAT, '9999-12-31') /*<OPTGUIDELINES><NLJOIN><ACCESS TABLE='V'/><IXSCAN TABLE='B'/></NLJOIN></OPTGUIDELINES>*/;
Local fix
Adding guideline to disable the expression index or adding guideline to force a plan using HSJN. /*<OPTGUIDELINES> <REGISTRY> <OPTION NAME='DB2_STATVIEW' VALUE='false'/> </REGISTRY> </OPTGUIDELINES>*/
Problem summary
**************************************************************** * USERS AFFECTED: * * all * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to 11.1.4.7 * ****************************************************************
Problem conclusion
Upgrade to 11.1.4.7
Temporary fix
Comments
APAR Information
APAR number
IT29641
Reported component name
DB2 FOR LUW
Reported component ID
DB2FORLUW
Reported release
B10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-07-08
Closed date
2022-04-17
Last modified date
2022-04-17
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
IT38797
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