|
Problem IC67420
|
Status: Closed |
DB2 ABENDS USING SCALAR AGGREGATION FUNCTION WITH CONNECTION CONCENTRATOR ENABLED |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
PROBLEM DESCRIPTION:
====================
When using Scalar Aggregation functions with Connection
Concentrator enabled, memory allocated for the scalar
aggregation execution may become invalid when the connection is
serviced by different agents, causing DB2 to trap/abend. An
additional requirement is that "with hold cursors" are being
used, but this is common.
Connection Concentrator is enabled when the database manager
configuration parameter MAX_CONNECTIONS exceeds MAX_COORDAGENTS.
This criteria applies when these parameters are set to
AUTOMATIC, in which case the criteria applies to the underlying
values.
For example, this configuration shows Connection Concentrator
enabled:
Max number of coordinating agents (MAX_COORDAGENTS) =
AUTOMATIC(200)
Max number of client connections (MAX_CONNECTIONS) =
AUTOMATIC(1000)
Example diagnostic trap files will include the keyword/function
sqlriScalagClose:
Example 1:
<StackTrace>
...
sqloEDUCodeTrapHandler + 0x0107
address: 0x00002AAAAABD4C00
sqldmcloP8sqeAgentPP8SQLD_CCBi + 0x002a
sqlriScalagCloseDropTempP8sqlrr_cbP16sqlri_buffer_mgr + 0x007f
sqlri_buffer_closeP8sqlrr_cbP15sqlri_scalagobj + 0x021d
sqlriScalagCloseP8sqlrr_cbP15sqlri_scalagobj + 0x003c
Example 2:
<StackTrace>
...
sqloCrashOnCriticalMemoryValidationFailure + 0x1C
diagnoseMemoryCorruptionAndCrash__13SQLO_MEM_POOLFUlCPCc + 0x260
sqloDiagnoseFreeBlockFailure__FP8SMemFBlk + 0x748
sqloDiagnoseFreeBlockFailure__FP8SMemFBlk@glue69E + 0x74
sqlofmblkEx + 0x48
sqlri_buffer_close__FP8sqlrr_cbP15sqlri_scalagobj + 0xB0
sqlriScalagClose__FP8sqlrr_cbP15sqlri_scalagobj + 0x2C
sqlriScalagClose__FP8sqlrr_cbP15sqlri_scalagobj@glue10D1 + 0x70
sqlricjpInfrequent__FP8sqlrr_cbPP12sqlri_opparml + 0x4
sqlricjp__FP8sqlrr_cbP12sqlri_opparmilT4 - 0x170
sqlricls_simple__FP8sqlrr_cbil + 0xCC |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Systems with Connection Concentrator using ScalarAggregation *
****************************************************************
* PROBLEM DESCRIPTION: *
* See error description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to a level of DB2 containing the APAR *
**************************************************************** |
| Local Fix: |
Disable Connection Concentrator:
db2 update dbm cfg using MAX_CONNECTIONS -1 automatic
db2stop;db2start
This results in the following standard configuration:
Max number of coordinating agents (MAX_COORDAGENTS) =
AUTOMATIC(200)
Max number of client connections (MAX_CONNECTIONS) =
AUTOMATIC(MAX_COORDAGENTS) |
| available fix packs: |
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
Problem first fixed in DB2 Version 9.5 Fix Pack 6 |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC67425 IC67426
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 24.03.2010
14.06.2010
14.06.2010 |
| Problem solved at the following versions (IBM BugInfos) |
9.5.FP6
|
| Problem solved according to the fixlist(s) of the following version(s) |
