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Problem IC76214
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Status: Closed |
Select from MON_BP_UTILIZATION might return SQL0413N due to overflow in ASYNC_NOT_READ_PERCENT column |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
The ASYNC_NOT_READ_PERCENT column is calculated as
(unread_prefetch_pages / total_async_reads). In some cases the
accounting of these two counters are incorrect, causing the
ratio to be > 1. This usually happens when a prefetcher
encounters an error during the read request, which causes DB2 to
skip updating the total_async_reads, but not the
unread_prefetch_pages.
This problem usually happens after crash recovery or
rollforward recovery because a prefetcher could encounter errors
trying to prefetch pages that not yet exist. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All user *
****************************************************************
* PROBLEM DESCRIPTION: *
* The ASYNC_NOT_READ_PERCENT column is calculated as *
* (unread_prefetch_pages / total_async_reads). In some cases *
* the accounting of these two counters are incorrect, causing *
* the ratio to be > 1. This usually happens when a prefetcher *
* encounters an error during the read request, which causes *
* DB2 to skip updating the total_async_reads, but not the *
* unread_prefetch_pages. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to db2 Version 9.7 FixPak 5 *
**************************************************************** |
| Local Fix: |
Do not perform a select * from MON_BP_UTILIZATION, skip the
ASYNC_NOT_READ_PERCENT column in the select. |
| available fix packs: |
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
Problem was first fixed in Version 9.7 FixPak 5 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 05.05.2011
23.12.2011
23.12.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
|
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