PPDS Optimizer does it use strategy settings at all

Question

Hi. Does the PPDS optimizer use the strategy settings at all? in foreground DS planning board or background?
I am thinking not as changing any of the settings does not seem to make any difference.
eg block use or block ignore, it still puts orders into block.
Thanks
j

Answer 1

ron_bigman wrote:
Hi Sven,
Thank you for your answer.
The logic behind using bitmap index in the dimension table is the ability to use several indexes together.This is also possible with normal indexes. in fact the CBO might decide to change aon or more normal b*tree indexes into a bitmap index on the fly and combine both, if this is a sensible/fast way.
>
So if I run such a query
select *
from dim_tab1 d1 on d1.id1 = fd.id1
where d1.dim_col1='value1'
and d1.dim_col2='value2'
It will use both indexes, the one on dim_col1 and the one on dim_col2.
I noticed now that this query doesn't work as expected as well, which confirm my belief that the problem is not in the query it self but in the DB configuration.
Thanks
RonI doubt that it is a configuration issue. But possible is everything.
The problem is often that it is very difficult to predict how many values are returned for two different filter criteria. And especially not if these filter criteria are on another (dimension) table. Also for your tests it might be important whether the query gets the 'value1' literally as it is written or as a bind parameter ( dim_col1 = :1).