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DB2 - Problem description

Problem IC93811 Status: Closed

IN ENVIRONMENTS WHERE SORT MEMORY IS CONSTRAINED SEGV CAN HAPPEN ON HASH
JOIN QUERIES DOING AGGREGATION

product:
DB2 FOR LUW / DB2FORLUW / A10 - DB2
Problem description:
1.  Problem description 
 
DB2 can SEGV when a query does a hash join followed by 
aggregation. The typical stack will look like: 
 
?unknown + 0x0 
sqlriPeaItr__FP8sqlrr_cbP9sqlri_agoPl + 0xDDC 
sqlripea2__FP8sqlrr_cb + 0xCC 
sqldEvalDataPred__FP13SQLD_DFM_WORKPUlP10SQLD_DPRED + 0x304 
@113@sqldRIDlistFetch__FP8SQLD_CCBP12SQLD_ID_LIST + 0x118 
sqldRowFetch__FP8sqeAgentP8SQLD_CCBUlT3PP10SQLD_VALUEP8SQLZ_RIDT 
3P12SQLD_ID_LISTP9SQLP_LSN8 + 0x14C 
sqlriListFetch__FP8sqlrr_cb + 0x200 
sqlrihsjn__FP8sqlrr_cb + 0x3C 
sqlrievl__FP8sqlrr_cb + 0x20 
sqlriunn__FP8sqlrr_cbP10sqlri_stob + 0x21C 
sqlriset__FP8sqlrr_cb + 0x18 
sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x24 
sqlrr_process_fetch_request__FP14db2UCinterface + 0xF60 
sqlrr_fetch__FP14db2UCinterfaceP15db2UCCursorInfo + 0xE9C 
sqljs_ddm_cntqry__FP14db2UCinterfaceP13sqljDDMObject + 0x178C 
sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UC 
interface + 0x1F8 
.sqljsParse.fdpr.clone.102__FP13sqljsDrdaAsCbP14db2UCinterfaceP8 
sqeAgentb + 0x13A4 
@73@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0x280 
@73@sqljsDriveRequests__FP8sqeAgentP14db2UCconHandle + 0xB4 
@73@sqljsDrdaAsInnerDriver__FP18SQLCC_INITSTRUCT_Tb + 0x4E8 
sqljsDrdaAsDriver__FP18SQLCC_INITSTRUCT_T + 0x21C 
RunEDU__8sqeAgentFv + 0x584 
EDUDriver__9sqzEDUObjFv + 0x13C 
sqlzRunEDU__FPcUi + 0x10 
sqloEDUEntry + 0x264 
 
There will two important messages in db2diag.log which will 
point to the issue. 
 
Message#1 
-------------- 
 
2013-06-19-04.50.47.802165-240 E14241455A535        LEVEL: 
Warning 
PID     : 44761092             TID : 33677          PROC : 
db2sysc 0 
INSTANCE: edad01               NODE : 000           DB   : 
TEDADB 
APPHDL  : 0-27015              APPID: 
30.135.65.102.52961.130617051714 
AUTHID  : WBIDBWEB             HOSTNAME: va10duvdb2006 
EDUID   : 33677                EDUNAME: db2agent (TEDADB) 0 
FUNCTION: DB2 UDB, runtime interpreter, sqlriPEXInitHashTable, 
probe:3229 
MESSAGE : Partial Early Aggregation/Distinct running with 
reduced memory 
 
Message#2 
---------------- 
2013-06-19-04.50.47.801532-240 I14240780A674        LEVEL: 
Warning 
PID     : 44761092             TID : 33677          PROC : 
db2sysc 0 
INSTANCE: edad01               NODE : 000           DB   : 
TEDADB 
APPHDL  : 0-27015              APPID: 
30.135.65.102.52961.130617051714 
AUTHID  : WBIDBWEB             HOSTNAME: va10duvdb2006 
EDUID   : 33677                EDUNAME: db2agent (TEDADB) 0 
FUNCTION: DB2 UDB, runtime interpreter, sqlriPEXInitHashTable, 
probe:3194 
DATA #1 : unsigned integer, 4 bytes 
2 
DATA #2 : unsigned integer, 4 bytes 
2 
DATA #3 : unsigned integer, 8 bytes 
4294975487  << This value indicates the defect has been hit ( 
Value is too large ) 
DATA #4 : unsigned integer, 8 bytes 
12497 
DATA #5 : unsigned integer, 8 bytes 
4181203339 << This value indicates the defect has been hit
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 v10.1 FP3                                     * 
****************************************************************
Local Fix:


available fix packs:


DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows
 DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
 DB2 Version 10.1 Fix Pack 3a for Linux, UNIX, and Windows
 DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows
 


Solution


Fixed in DB2 v10.1 FP3.


Workaround


not known / see Local fix


Timestamps


Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

28.06.2013
25.09.2013
25.09.2013


Problem solved at the following versions (IBM BugInfos)




Problem solved according to the fixlist(s) of the following version(s)


10.1.0.3

FixList



10.1.0.3

FixList