|
Problem IC99956
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Status: Closed |
CONCURRENT REORGS ON DIFFERENT DATA PARTITIONS OF THE SAME PARTI TIONED TABLE MIGHT EXECUTE SEQUENTIALLY DURING IDXRECREAT PHASE. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
Once you execute concurrent REORG operations like:
db2 "reorg table T1 allow no access on data partition PART0"
db2 "reorg table T1 allow no access on data partition PART1"
on table T1 meting criteria required for parallel reorg, you may
notice that IdxRecreat phase is being sequential.
The problem is caused by latching during the processing what
prevents parallel execution.
The problem can only be hit when INTRA_PARALLEL is turned on or
when using database partitioning feature.
Observable symptoms:
1. You might notice unexpected difference between REORG finish
times for partitions similar in size by observing REORG command
finish time or db2pd -reorg output.
2. You might notice in db2top output that only one REORG at the
time utilizes IO, while REORG for other partitions are idle.
3. In stacks collected during the issue occurrence, you can
notice that one REORG thread is holding
SQLO_LT_SQLD_TCB__loadInProgress latch, while other parallel
threads are waiting for the latch in subject. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* INTRA_PARALLEL ON or when using DPF *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 version 9.7 fixpack 10 *
**************************************************************** |
| Local Fix: |
|
| Solution |
Problem was first fixed in DB2 version 9.7 fixpack 10 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 10.03.2014
10.11.2014
10.11.2014 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP10
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.10
|
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