DB2 FOR LUW / DB2FORLUW / 980 - DB2

DB2 uses the individual column statistics to correct the 
cardinality estimate for predicates applied to columns in views 
enabled for optimization (statistical views, or statviews for 
short). When the predicate involves combinations of AND and OR 
predicates, the correction is not applied properly. 
 
For example, the statview column statistics would be used to 
estimate the filtering for predicates like: 
"column1 >= 7 and column1 <= 9", or 
"column1 = 7 or column1 = 9" 
 
However, it would not be used to estimate the filtering for 
predicates like: 
"column1 >= 7 and column1 <= 9 or 
 column1 >= 15 and column1 <= 18" 
 
This fix addresses the filtering estimate for the more complex 
predicate with predicates combined with OR and AND.

Will not be fixed in V9.8.

keiner bekannt / siehe Local-Fix

Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:

28.07.2010
01.12.2011
01.12.2011