Select Data From Huge Fact Tables

Hi,

I have a situation where I have 4 tables:

1. 2 Dimensional tables(Parent), DIM1 with 50000 rows, and DIM2 with 1000 rows

2. Fact 1 with 50 columns, 25 Million rows and with FK to DIM1 and DIM2

3. Fact 2 with 40 columns, and 25 Million rows and with FK to DIM1 & DIM2 tables.

Actually the fact 1 and fact 2 have same related data but since our Analysis cube person wanted the fact table not to have more than 50 columns we divided the tables into 2, but they have the same compound key.

Above said, I have a situation where I have to select all the columns, in both fact tables, and do a group by. I wrote the query and ran "Analyze Query in the Database Engine Tuning Advisor" for it. It gave bunch of recomendations about the statistics and indexes which I created. When I executed the query the result came up in matter of seconds, which was good.

In the query I had a condition having MarketName='Bridgeview' and DateID = 344 (FK of today-1).

When I wanted the data for last 30 days I changed to DateID in ( > FK of today -32 and < FK of today), the query responded and worked fine.

But when I changed the query to get MarketName='Aurora' (other than I used when I ran Tuning Advisor), the result returned is empty set. When I removed the MarketName condition, it is supposed to return all markets' data, but it returns only Bridgeview data.

I know the data is in the table for all markets, since reports are rendered from these fact tables for all of these markets(also ran queries to check the fact table data).

I am unable to point out the reason why the query behaves like this. It responds to the date change, but not to the MarketName change.

I really appreciate if anyone can help me point out the problem.

Thanks,

Venkat