DB2 - Problembeschreibung
Problem IC81222 | Status: Geschlossen |
A QUERY WITH OLAP FUNCTION OVER(PARTITION BY ...) MAY HANG IN SQLRI_BUFFER_DISK_WRITE() | |
Produkt: | |
DB2 FOR LUW / DB2FORLUW / 910 - DB2 | |
Problembeschreibung: | |
A query with OLAP function OVER(PARTITION BY ...) may encounter a hang in sqlri_buffer_disk_write() function. This may happen if there is not enough APPLHEAP available and the rows have a very high number of the same partition values (high data skew) . A typical stack trace obtained would show: <StackTrace> -------Frame------ ------Function + Offset------ 0x090000000BA5D39C sqlri_buffer_disk_write__FP16sqlri_buffer_mgrPP14sq 0x090000000BA5D534 sqlri_buffer_disk_write__FP16sqlri_buffer_mgrPP14sq 0x090000000BA5E358 @66@sqlri_buffer_get_new_page__FP16sqlri_buffer_mgr 0x0900000009FFECF0 sqlri_buffer_add__FP16sqlri_buffer_mgrP10sqlri_sqzo 0x090000000AE2DEB4 sqlri_scalag__FP8sqlrr_cb - 0x55C 0x090000000AE3FDC8 sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x94 0x090000000A52B8D8 sqlrr_dss_router__FP8sqlrr_cb + 0x230 0x0900000009C4BC60 sqlrr_subagent_router__FP20sqle_agent_privatecbP10s 0x0900000009D449C8 sqleSubRequestRouter__FP13sqle_agent_cbPUiT2 + 0x41 0x090000000A3DFF30 sqleProcessSubRequest__FP13sqle_agent_cb + 0x230 0x0900000009F4899C sqleRunAgent__FPcUi + 0x8E8 0x090000000AEEBCDC sqloCreateEDU__FPFPcUi_vPcUlP13SQLO_EDU_INFOPi + 0x 0x090000000AF563E0 sqloSpawnEDU + 0x230 0x090000000AF55F18 sqleCreateNewAgent__FiP8sqlekrcbP17sqlcc_init_struc 0x090000000AF57570 sqleGetAgentFromPool__FiP17sqlcc_init_structT1P12sq 0x090000000AF58170 sqleGetAgent__FiP17sqlcc_init_structT1P12sqlz_app_h 0x090000000AF69668 sqlccipcconnmgr_child__FPcUi + 0x340 ... In addition you will observere that the db2 agent still uses CPU cycle. | |
Problem-Zusammenfassung: | |
**************************************************************** * USERS AFFECTED: * * ALL * **************************************************************** * PROBLEM DESCRIPTION: * * See Problem Description above. * **************************************************************** * RECOMMENDATION: * * Upgrade to DB2 Version 9.1 Fix Pack 12. * **************************************************************** | |
Local-Fix: | |
Lösung | |
First fixed in DB2 Version 9.1 Fix Pack 12. | |
Workaround | |
keiner bekannt / siehe Local-Fix | |
Weitere Daten | |
Datum - Problem gemeldet : Datum - Problem geschlossen : Datum - der letzten Änderung: | 06.02.2012 02.08.2012 02.08.2012 |
Problem behoben ab folgender Versionen (IBM BugInfos) | |
9.1.FP12 | |
Problem behoben lt. FixList in der Version | |
9.1.0.12 |