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DB2 - Problem description

Problem IT05631 Status: Closed

FIX EMP CHAIN WALKING CODE IN INCREMENTAL BACKUP CODE PATH

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
Incremental backup with tablespaces that have a very large 
number of non-headered pages (ie. type lob, clob, etc) can 
fail with a -902 error.  Stack traces will indicate 
sqlbMapIndirectEMPs, and diagnostic messages regarding bad 
page reads might occur. 
 
Example Stack 
0] 0x00002AC7188E9842 pdLog + 0x230 
  [1] 0x00002AC719100E68 _Z19sqlbGetPageFromDiskP11SQLB_FIX_CBi 
+ 0x1754 
  [2] 0x00002AC718E39940 _Z7sqlbfixP11SQLB_FIX_CB + 0x4B70 
  [3] 0x00002AC7182E0C0E _Z11sqlbFixPageP11SQLB_FIX_CBiji + 
0x33A 
  [4] 0x00002AC718EDB11D 
_Z19sqlbMapIndirectEMPsP12SQLB_GLOBALSP11SQLB_FIX_CBjPcjP16SQLB_ 
OBJECT_DESCP12SQLB_POOL_CB + 0x1F1 
  [5] 0x00002AC718EDBCE2 
_Z24sqlbMapLongObjectExtentsP12SQLB_GLOBALStPPcPj + 0x884 
  [6] 0x00002AC71A47F88C _Z12sqlubReadDMSP14SQLU_BUFMAN_CB + 
0x89C 
  [7] 0x00002AC71A47C5B4 _Z18sqlubBMProcessDataP14SQLU_BUFMAN_CB 
+ 0x9B8 
  [8] 0x00002AC71A47A750 _Z8sqlubbufP8sqeAgent + 0xA90 
  [9] 0x00002AC7198E55D6 
_Z26sqleSubCoordProcessRequestP8sqeAgent + 0x1AC 
  [10] 0x00002AC71991FA79 _ZN8sqeAgent6RunEDUEv + 0x3EB 
  [11] 0x00002AC71ECAC58C _ZN9sqzEDUObj9EDUDriverEv + 0x17C 
  [12] 0x00002AC71ECAC1B4 _Z10sqlzRunEDUPcj + 0x26 
  [13] 0x00002AC71C4A6DC3 sqloEDUEntry + 0x971 
  [14] 0x00002AC7167692A3 /lib64/libpthread.so.0 + 0x62A3 
  [15] 0x00002AC7252116DD __clone + 0x6D 
 
Example DiagProbe 
 
2013-05-14-19.42.48.963713-240 I187893E6851          LEVEL: 
Warning 
PID     : 3915                 TID : 47035097016640  KTID : 6420 
PROC    : db2sysc 
INSTANCE: shawnrr              NODE : 000            DB   : EMP1 
APPHDL  : 0-76                 APPID: 
*LOCAL.shawnrr.130514234237 
AUTHID  : SHAWNRR              HOSTNAME: hotellnx99 
EDUID   : 299                  EDUNAME: db2bm.277.1 (EMP1) 
FUNCTION: DB2 UDB, buffer pool services, sqlbGetPageFromDisk, 
probe:932 
MESSAGE : ZRC=0x87020036=-2029912010=SQLB_BADHDR "Bad Page 
Header" 
          DIA8547C An error occurred in a database page header. 
DATA #1 : String, 39 bytes 
Page from disk doesn't match obj or BPD 
DATA #2 : Page header, PD_TYPE_SQLB_PAGE_HEAD, 48 bytes 
... 
 
The number of pages required to encounter this problem is based 
on both the page size and the extent size, with the issue being 
more likely to be seen if both page size and extent size are 
small.  The issue requires there to be Level 2 EMP pages created 
to map the pages in the tablespace which is a factor of the 
afforementioned conditions. 
 
As an example for 4K pages and an extent size of 2 (the smallest 
possible combo), one requires a minimum of 3939970 pages to have 
the possibility of seeing this problem. 
 
For an 8K page, the number of pages increases to 16297114.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* See Error Description                                        * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 9.7 for Linux, UNIX, and Windows Fix Pack 11  * 
****************************************************************
Local Fix:
Solution
Problem first fixed in DB2 9.7 for Linux, UNIX, and Windows Fix 
Pack 11
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
18.11.2014
06.10.2015
06.10.2015
Problem solved at the following versions (IBM BugInfos)
9.7.
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.11 FixList
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