|
Problem IC77345
|
Status: Closed |
NEGATIVE COST OR CARDINALITY MAY BE SEEN IN ACCESS PLAN WHEN UNNEST TABLE FUNCTION IS USED IN QUERIES. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
In queries, using UNNEST table function, sometimes based on some
statistics, negative cost or cardinality may be seen in access
plan of queries.
Ex:
Access Plan:
-----------
Total Cost: -32.6706
Query Degree: 1
Rows
RETURN
( 1)
Cost
I/O
|
0.175684
TBSCAN
( 2)
-32.6706
NA
|
0.175684
SORT
( 3)
-32.671
NA
|
0.175684
UNION
( 4)
-32.6718
NA
/--------------------------------------------------+------------
---------------------------------------\
0.182813
-0.00712883
^NLJOIN
>^NLJOIN
( 5)
( 15)
31.2597
-63.9317
NA
NA
/--------------+--------------\
/-------------------------+-------------------------\
0.182813
21.7391
-0.00712883 1
NLJOIN
TBSCAN
NLJOIN FETCH
( 6)
( 14)
( 16) ( 50)
31.2545
0.112203
-79.072 22.7011 |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users on DB2 v97 Fp4 or lower *
****************************************************************
* PROBLEM DESCRIPTION: *
* NEGATIVE COST OR CARDINALITY MAY BE SEEN IN ACCESS PLAN WHEN *
* UNNEST TABLE FUNCTION IS USED IN QUERIES. *
****************************************************************
* RECOMMENDATION: *
* First Fixed in DB2 V97 fp5. *
**************************************************************** |
| Local Fix: |
No Local Fix. |
| 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 |
Apply DB2 v97 Fp5 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 05.07.2011
19.12.2011
19.12.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP5
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
|
 |
