|
Problem IC83906
|
Status: Closed |
OPTIMIZER NOT DETECTING THAT A TEMP TABLESPACE OF SUFFICIENT SIZE DOES NOT EXIST WHEN RUNNING WITH INTRA_PARALLEL ON |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
For queries containing a group-by clause, if a SORT operation is
not required, as determined by the DB2 Optimizer, you might
encounter the following error in the db2diag.log if the
intra-partition parallelism feature is used:
FUNCTION: DB2 UDB, trace services, sqlt_logerr_string (secondary
logging fu, probe:0
MESSAGE : Sort reclen limit exceeded
DATA #1 : String, 157 bytes
Sort. In function sqlsTableInfoSetup( ) Line 800
Record length exceeds <k> -- the maximum allowed for this
temporary tablespace.
Sort record length <m>
where <k> and <m> are integer values, with <m> greater in value
than <k>.
You can verify the access plan chosen by the optimizer might
result in this error by collecting an EXPLAIN of the query and
checking for a SORT operator between two GRPBY operators, with
cardinality and cost values set to the maximum float value, such
as in the following example:
124177
GRPBY
( 5)
INF
3.40282e+38
|
3.40282e+38
TBSCAN
( 6)
3.40282e+38
3.40282e+38
|
3.40282e+38
SORT
( 7)
3.40282e+38
3.40282e+38
|
124177
GRPBY
( 8)
45239.9
16870
It is also possible that the instance could crash as a result of
the above error. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Intra-partition parallelism environment *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to version 9.7 Fix Pack 7 *
**************************************************************** |
| Local Fix: |
Avoid this problem by setting the current degree special
register to 1 prior to compiling the affected statement(s) or
turn off the intra_parallel database configuration. |
| available fix packs: |
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 |
This problem is first fixed in DB2 Version 9.7 Fix Pack 7 |
| Workaround |
See Local Fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 01.06.2012
20.10.2012
20.10.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP7
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.7
|
 |
