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DB2 - Problem description

Problem IC74565 Status: Closed

DB2 might abend while creating MQT whose definition is recursive and has
common table expression as well as IN predicate

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
MQT creation might trap with infinite recursive calls of 
sqlnq_reroutable_ast_rec in the trap file. This happens only 
when MQT definition has the following characteristics: 
1. MQT definition has CSE (Common Sub Expression), called V1 
2. MQT has recursive UNION ALL construct, called V2. V2 has two 
union all branches. The first union branch references V1 and the 
second branch references V1 and V2 of course. 
3. V2 second branch has IN predicate and the element list 
consists of multiple values or expressions. 
 
Example: 
-- create a base table 
create table t1(c1 int, c2 int); 
-- mqt creation traps 
create table mqt as ( 
with v1(c1, c2) as (select * from t1), 
      v2(level, c1, c2) as (select 1, v1.* from v1 union all 
                                  select parent.level+1, 
parent.c1, parent.c2 from v2 parent, v1 child 
                                  where parent.c1 = child.c1 and 
child.c2 in (1,2) and parent.level < 10) 
select c1, c2 from v2 
) data initially deferred refresh deferred;
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See error description above.                                 * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.1 Fix Pack 11.                      * 
****************************************************************
Local Fix:
Make V1 a regular view and change MQT definition to reference V1 
instead of common table expression.
available fix packs:
DB2 Version 9.1 Fix Pack 11  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 12  for Linux, UNIX and Windows

Solution
First fixed in DB2 Version 9.1 Fix Pack 11.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC78347 IC78348 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
18.02.2011
08.12.2011
08.12.2011
Problem solved at the following versions (IBM BugInfos)
9.1.FP11
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.11 FixList
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