DB2 - Problem description
Problem IT11990 | Status: Closed |
QUERY COMPILATION MAY FAIL WITH: -901 SQLNO_GET_BEST_PLAN[200] WHEN ZIGZAG JOIN (ZZJN) IS CONSIDERED | |
product: | |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 | |
Problem description: | |
A query compilation might fail with SQL0901N ( sqlno_get_best_plan) if a ZigZag join is considered. FODC_AppErr data is written and the following can be seen in db2diag.log: 2015-03-02-12.38.45.394532+060 I142140A919 LEVEL: Severe PID : 10354794 TID : 263679 PROC : db2sysc 0 INSTANCE: db2inst1 NODE : 000 DB : SAMPLE APPHDL : 0-25631 APPID: 199.99.66.94.36392.150302113429 AUTHID : USER12 HOSTNAME: myhost EDUID : 263679 EDUNAME: db2agent (SAMPLE) 0 FUNCTION: DB2 UDB, relation data serv, sqlrr_dump_ffdc, probe:300 DATA #1 : SQLCA, PD_DB2_TYPE_SQLCA, 136 bytes sqlcaid : SQLCA sqlcabc: 136 sqlcode: -901 sqlerrml: 58 sqlerrmc: sqlno_get_best_plan [200]:rc( 0) sqlerrp : SQLNN067 sqlerrd : (1) 0x803100AF (2) 0x000000AF (3) 0x00000000 (4) 0x00000000 (5) 0xFFFFFDA8 (6) 0x00000000 sqlwarn : (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 2015-03-02-12.38.53.068015+060 E202409A2288 LEVEL: Info (Origin) PID : 10354794 TID : 263679 PROC : db2sysc 0 INSTANCE: db2inst1 NODE : 000 DB : SAMPLE APPHDL : 0-25631 APPID: 199.99.66.94.36392.150302113429 AUTHID : USER12 HOSTNAME: myhost EDUID : 263679 EDUNAME: db2agent (SAMPLE) 0 FUNCTION: DB2 UDB, SW- common services, sqlnn_cmpl, probe:650 MESSAGE : ZRC=0x803100AF=-2144272209=SQLNN_E_BADNEWS "unexpected error but state is OK" DATA #1 : String, 62 bytes An unexpected error was detected during statement compilation. DATA #2 : Boolean, 1 bytes false DATA #3 : Boolean, 1 bytes false DATA #4 : Boolean, 1 bytes true DATA #5 : Boolean, 1 bytes false DATA #6 : Hex integer, 4 bytes 0x00000000 DATA #7 : SQLCA, PD_DB2_TYPE_SQLCA, 136 bytes sqlcaid : SQLCA sqlcabc: 136 sqlcode: -901 sqlerrml: 58 sqlerrmc: sqlno_get_best_plan [200]:rc( 0) sqlerrp : SQLNN067 sqlerrd : (1) 0x803100AF (2) 0x000000AF (3) 0x00000000 (4) 0x00000000 (5) 0xFFFFFDA8 (6) 0x00000000 sqlwarn : (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) sqlstate: DATA #8 : Hex integer, 4 bytes 0x00000040 DATA #9 : String with size, 451 bytes SELECT ... DATA #10: String, 445 bytes Compiler error stack for rc = -2144272209: sqlnn_cmpl[380] sqlno_exe[900] sqlno_planning_phase[200] sqlno_planning_scan[400] sqlno_scan_utils_qgm[200] sqlno_each_qur[400] sqlno_top_qtb[100] sqlno_each_opr[200] sqlno_walk_qun[100] sqlno_each_opr[1200] sqlno_plan_end_opr[100] sqlno_gen_partitions_for_Q[300] sqlno_open_part[410] sqlno_generate_zzjn_plans[40] sqlno_generate_single_fact[80] sqlno_zzjn_generate_snowfl[10] sqlno_get_best_plan[200] ... | |
Problem Summary: | |
**************************************************************** * USERS AFFECTED: * * ALL * **************************************************************** * PROBLEM DESCRIPTION: * * See Problem Description above. * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 Version 10.5 Fix Pack 7. * **************************************************************** | |
Local Fix: | |
disable ZigZag joins by setting the following keyword db2set DB2_REDUCED_OPTIMIZATION='ZZJN OFF' | |
Solution | |
First fixed in DB2 Version 10.5 Fix Pack 7. | |
Workaround | |
not known / see Local fix | |
Timestamps | |
Date - problem reported : Date - problem closed : Date - last modified : | 27.10.2015 20.01.2016 20.01.2016 |
Problem solved at the following versions (IBM BugInfos) | |
Problem solved according to the fixlist(s) of the following version(s) | |
10.5.0.7 |