|
Problem IT13366
|
Status: Geschlossen |
OPTIMIZER FAVOURS HSJOIN OVER A BETTER NLJOIN WHEN JOIN COLUMN HAS LESS THAN 3 DISTINCT VALUES |
| Produkt: |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 |
| Problembeschreibung: |
The optimizer might favour a HSJOIN over a better performing
NLJOIN if there are one or more equality join preds where the
join column on the outer input of the NLJOIN has less than 3
distinct values and the other has a large number of distinct
values. |
| Problem-Zusammenfassung: |
****************************************************************
* USERS AFFECTED: *
* DB2 UDB Version 10.5 *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Version 10.5 FixPack 7. *
**************************************************************** |
| Local-Fix: |
You can apply an optimization profile to request the optimizer
to choose a NLJOIN |
| Lösung |
Problem was first fixed in DB2 UDB Version 10.5 FixPack 7. |
| Workaround |
keiner bekannt / siehe Local-Fix |
| Weitere Daten |
Datum - Problem gemeldet :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
| 22.01.2016
02.06.2016
02.06.2016 |
| Problem behoben ab folgender Versionen (IBM BugInfos) |
|
| Problem behoben lt. FixList in der Version |
| 10.5.0.7
|
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