DB2 FOR LUW / DB2FORLUW / A50 - DB2

DB2 may crash during query compilation when the following 
conditions are both met: 
1. Query has left outer join "TABLE_A LEFT OUTER JOIN TABLE_B ON 
..." 
2. The ON clause includes always false predicate, e.g."'a' || 
col1 = 'b' || col2" 
3. (Optional) The ON clause include OR predicates which can be 
factorized into common parts, eg. "(col1=col2 and col3 < 10) or 
(col1=col2 and col3 > 50)" 
 
A known call stack of this crash is: 
 
0        sqlnr_matchmaker::nav_assign_max_levels 
1        sqlnr_matchmaker::nav_assign_max_levels 
2        sqlnr_matchmaker::nav_assign_max_levels 
3        sqlnr_matchmaker::nav_assign_max_levels 
4        sqlnr_matchmaker::nav_assign_max_levels 
5        sqlnr_matchmaker::nav_assign_max_levels 
6        sqlnr_matchmaker::nav_init 
7        sqlnr_matchmaker::form_matches 
8        sqlnr_form_common_subexprs 
9        sqlnr_optprep 
10       sqlnr_optprep_action 
11       sqlnr_comp 
12       sqlnr_comp 
13       sqlnr_seq 
 
 
Another know call stack for this issue is the following: 
 
0        sqlnq_qnc::is_RIDC_qnc 
1        sqlnq_pid::UDT_colequiv_exp 
2        sqlnr_build_equiv 
3        sqlnr_coleq_class_action 
4        sqlnr_comp 
5        sqlnr_seq 
6        sqlnr_rcc 
7        sqlnr_endqtb_action 
8        sqlnr_comp 
9        sqlnr_seq 
10       sqlnr_rcc 
11       sqlnr_start_action 
12       sqlnr_comp 
13       sqlnr_seq 
14       sqlnr_rcc 
15       sqlnr_exe 
16       sqlnn_cmpl

**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 105 fix pack 3                        * 
****************************************************************

1) Rewrite the always false predicate "'a' || col1 = 'b' || 
col2" to "1=0". 
2) Rewrite the query to contain factorized predicate "col1=col2 
and (col3 < 10 or col3 > 50)"

DB2 Version 10.5 Fix Pack 3 for Linux, UNIX, and Windows
 DB2 Version 10.5 Fix Pack 3a for Linux, UNIX, and Windows
 DB2 Cancun Release 10.5.0.4 (also known as Fix Pack 4) for Linux, UNIX, and Windows
 DB2 Version 10.5 Fix Pack 9 for Linux, UNIX, and Windows
 

Please upgrade to DB2 version 105 fix pack 3

keiner bekannt / siehe Local-Fix

Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:

27.08.2013
27.02.2014
27.02.2014