|
Problem IC84265
|
Status: Closed |
DB2 MAY PANIC DURING ATTEMPT TO UNFIX (SQLBUFIX) A PAGE FROM BUFFERPOOL |
| product: |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 |
| Problem description: |
When INSPECTing a damaged object DB2 may read bad pages into the
bufferpool without detecting them.
This happens with pages that belong to the same object and
therefore look like a valid page.
The actual corruption is the data pages being out of sync with
the objects EMPs.
A possible sequence of events that may result in the above
corruption and instance PANIC is:
- a not logged operation (NLI) against an object is
aborted/rolled back
- the object is in drop pending state after the NLI operation
- INSPECT with option ERROR STATE ALL is executed against the
object
- error SQL1224N is hit and instance is brought down
A possible stack may look like following:
...
sqlb_panic
sqlbufix
dartCall_sqlbUnFixPage
dartUnfixPage
dartScanDAT
dartScanTable
dartScanTablespace
dartInspect
This APAR will ensure DB2 detects the corruption upon fixing the
page (sqlbfix) instead of successfully loading it into
bufferpool and fail upon releasing/unfixing the page from
bufferpool. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Version 10.1 Fix Pack 1 *
**************************************************************** |
| Local Fix: |
1) For objects with questionable states, do not use the FOR
ERROR STATE ALL clause with INSPECT.
2) For objects with questionable states, use db2dart to inspect
them. |
| available fix packs: |
DB2 Version 10.1 Fix Pack 1 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 2 for Linux, UNIX, and Windows
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 |
First fixed in DB2 Version 10.1 Fix Pack 1 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 13.06.2012
02.11.2012
02.11.2012 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.1.0.1
|
 |
| 10.5.0.1
|
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