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DB2 - Problem description

Problem IT05753 Status: Closed

APPLICATION HUNG DOING INSERT/SELECT ON TABLE WITH XML COLUMNS AND COMPRESS
YES

product:
DB2 FOR LUW / DB2FORLUW / A50 - DB2
Problem description:
An application running inserts/updates and selects on a 
table with XML columns and compression might hang and not able 
to be forced off. 
 
The scenario is : 
 
open transaction 
  insert .. 
  select.. 
 
 
db2pd -latches will show a deadlatch on 
SQLO_LT_SQLB_BPD__bpdLatch_SX S (i.e a two threads waiting on 
each other) 
 
Database Member 0 -- Active -- Up 0 days 00:06:43 -- Date 
2014-11-21-12.16.25.721195 
 
Latches: 
Address            Holder     Waiter     Filename 
LOC        LatchType            HoldCount 
0x0780000001588440 1029       0 
../include/sqle_workload_disp.h 1389 
SQLO_LT_sqeWLDispatcher__m_tunerLatch 1 
0x0700000047C2F468 13391      0 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000053E99768 13391      0 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      13134 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      13648 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      14162 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      14419 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      14676 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      14933 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      15190 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
>>>>>>>>>> 
0x0700000047D5BC28 13391      15447 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
<<<<<<<<<< 
0x0700000047D5BC28 13391      15704 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      15961 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      16218 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      16475 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047D5BC28 13391      16732 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047C50A28 15447      0 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
0x0700000047E8D9A8 15447      0 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
>>>>>>>>>> 
0x0700000047D35DE8 15447      13391 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
<<<<<<<<<< 
0x0700000047D35DE8 15447      13905 
/view/db2_v105fp3_aix64_n140813/vbs/engn/sqb/inc/sqlbslat.h 649 
SQLO_LT_SQLB_BPD__bpdLatch_SX S 
 
Stacks for the threads will show the wait is on XML code. 
 
31 (1)   SQLO_SLATCH_CAS64::getConflictComplex 
32 (2)   SQLO_SLATCH_CAS64::getConflict 
33 (3)   sqlbfix 
34 (4)   sqldcsl_fetchDirect 
35 (5)   sqldcsl_fetchRow 
36 (6)   xmls_FetchRegion 
37 (7)   XmlrnNodeMgr::fetchNode 
38 (8)   XmlrnTreeWalker::resolveContinuationNode 
39 (9)   XmlrnSerializer::serialize 
40 (10)          XmlrnSerializer::serialize 
41 (11)          XmlrnSerializer::serialize 
42 (12)          sqlriMaterializeXml 
43 (13)          sqlribnoLobCbDrda 
44 (14)          sqlribno_work 
45 (15)          sqlribno_work 
46 (16)          sqlribno 
47 (17)          sqlriSectInvoke 
48 (18)          sqlrr_process_fetch_request 
49 (19)          sqlrr_fetch 
50 (20)          sqljsParseRdbAccessed 
51 (21)          sqljsSqlam 
52 (22)          sqljsSqlam 
53 (23)          sqljsSqlam 
54 (24)          sqljsDriveRequests 
55 (25)          sqljsDrdaAsInnerDriver 
56 (26)          sqeAgent::RunEDU 
57 (27)          sqeAgent::RunEDU 
58 (28)          sqzEDUObj::EDUDriver 
59 (29)          sqloEDUEntry
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 10.5 and Fix Pack 7                   * 
****************************************************************
Local Fix:
Do not use compression on Tables with XML columns or 
when insert - update XML tables , place a commit before doing a 
select on the table on the same transaction: 
 
open transaction 
  insert .. 
  commit 
 open transaciton. 
  select.. 
 
intead of : 
open transaction 
  insert .. 
  select...
Solution
Problem was first fixed in DB2 Version 10.5 and Fix Pack 7
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

24.11.2014
19.01.2016
27.04.2016
Problem solved at the following versions (IBM BugInfos)


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


10.5.0.7

FixList