Which free database would you use for a relatively small datawarehouse system?

Are there any 'special' databases e.g. multidimensional databases freely available?

Which of the free relational databases is best suited for the job?

By datawarehouse system I mean a system that will receive some inserts, few updates, next to no deletes and plenty of complex selects. Structured in star schemas (if the database is relational).

By small I mean about 100.000 records in the main fact table, maybe 10 dimensions, the largest containing 5.000 records.

Be free I mean free of charge of internal commercial use.

Edit: Since so far I mostly only got a list of free databases, let me specify some features that would be interesting / needed:

* outer joins (must)
* inlineviews / subselects (almost must)
* materialized views (nice)
* smart query optimizer (the smarter the better)
* support for dimensions, roll up, cube queries (nice)
* analytic functions (that's the name in oracle, don't know how they are named in other databases)(nice)