DB2 - Problem description
Problem IT36320 | Status: Closed |
QUERY EXECUTION MAY FAIL FOR OUTER JOIN QUERIES WITH PREDICATES WITH CAST FUNCTIONS | |
product: | |
DB2 FOR LUW / DB2FORLUW / B50 - DB2 | |
Problem description: | |
If you have a DPF system and a query that meets the following conditions : - query references multiple Outer joins - predicates in the ON clause reference Cast functions it may trap in sqlnr_OJ_semi_join() Example query: SELECT T1.C1 FROM T1 LEFT OUTER JOIN T2 ON T2.C1 = 'ITRA' LEFT OUTER JOIN T3 ON T3.C1 = CAST(T1.C1 AS VARCHAR(200)) ; Example stack trace for the failing query: sqlnr_OJ_semi_join sqlnr_qrwprep_phase2 sqlnr_prep2_action sqlnr_exe sqlnn_cmpl | |
Problem Summary: | |
**************************************************************** * USERS AFFECTED: * * all * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to 11.5.6 or later * **************************************************************** | |
Local Fix: | |
Set the following registry - with the optimization guideline to the affected queries: /* */ or - at the instance level: db2set DB2COMPOPT=NOOJSJ -im | |
Solution | |
Workaround | |
**************************************************************** * USERS AFFECTED: * * all * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to 11.5.6 or later * **************************************************************** | |
Comment | |
Upgrade to 11.5.6 or later | |
Timestamps | |
Date - problem reported : Date - problem closed : Date - last modified : | 23.03.2021 21.06.2021 21.06.2021 |
Problem solved at the following versions (IBM BugInfos) | |
Problem solved according to the fixlist(s) of the following version(s) |