Why does OWB 9.2 generate UK's on higher levels of a dimension?

When you specify levels in a dimension, OWB 9.2 generates unique key constraints in the table properties for every level, but only the UK on the lowest level is visible in the configuration properties. Why then are these higher level UK's generated? Is this a half baked attempt to implement the possiblility to generate a snow flake model in OWB?
Jaap.

Piotr, Roald and others,
This is indeed a topic we spend a lot of our time on these past months. We are addressing this as (in my old days I had the same problem as a consultant) we know that this is a common problem.
So the solution is one that goes in 2 directions:
- Snowflake support
- Advanced dimension data loading
Snowflake is obvious, may not be desired for various reasons but we will start supporting this and loading data for it in mapping.
If you want a star table, you will know that a completely flattened table with day at the lowest level will not be able to get you a unique entry for month. So what people tend to do is one of the following:
- Proclaim the first of the month the Month entry point (this stays closest to the star table and simply relies on semantics on both ETL and query side).
- Create extra day level entries which simbolize the month, so you have a day level with extra entries
- Create views, extra tables etc to cover the extra data
- Create a data set within the tables that solves the key problem
We have opted for the last one. What you need to do for this is a set of records that uniquely identify any record in any level. Then you add a key which links to the dimension at the same point (a dimension key), so all facts always use this surrogate key to link (makes life in query tools easier).
For a time dimension you will have a set of day records with their months etc in them (the regular star). Then you add a set of records with NULL in the day having months and up. And you go up the hierarchy. For this we will have the ETL logic (in other words you as a designer do not worry about this!). On the query tool you must be a little cautious on counts but this is doable and minor.
As you can see none of the solutions are completely transparent, but we believe this is one that solves a lot of problems and gives you the best of all worlds. We will also support the same data structure in the OLAP dimensions for the database as well in the relational dimension. NOTE that there are some disclaimers with this as we are doing software here...
In principal however we will solve your problem.
Hope this explains some of our plans in this area.
Jean-Pierre

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