|
Problem IT20574
|
Status: Closed |
QUERY MIGHT TRAP IN DATA PARTITION ELIMINATION OF A ZIGZAG JOIN |
| product: |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 |
| Problem description: |
A query involving zigzag join might result in segmentation
violation (SEGV) during data partition elimination phase
(sqlri_datapart_elimination). The stack of the process will
involve the following functions:
ossDumpStackTraceInternal
ossDumpStackTraceV98
OSSTrapFile::dumpEx
sqlo_trce
sqloEDUCodeTrapHandler
_intel_fast_memcmp
sqlrxcp2
sqlri_choose_tree_cmp
sqlri_datapart_elim_evalkey
sqlri_datapart_elim_set
sqlri_datapart_elimination
sqlriZZInit
sqlriZigZagJoin
sqlrihsjn
sqlriSectInvoke
sqlrr_smp_router
sqlrr_subagent_router
sqleSubRequestRouter
sqleProcessSubRequest
sqeAgent::RunEDU
sqzEDUObj::EDUDriver
sqlzRunEDU
sqloEDUEntry
pthread_tryjoin_np
clone
To temporarily circumvent the issue, you can disable zigzag
join: DB2_REDUCED_OPTIMIZATION=YES,ZZJN OFF either via db2set or
via an optimizer profile so that it is applied only for
this specific query. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* all *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to version 10.5 fix pack 9 *
**************************************************************** |
| Local Fix: |
|
| Solution |
First fixed in version 10.5 fix pack 9 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 12.05.2017
27.09.2017
27.09.2017 |
| Problem solved at the following versions (IBM BugInfos) |
9.0.
|
| Problem solved according to the fixlist(s) of the following version(s) |
