You have give the table names (Fact and dimension tables) to your DBAs and ask them to update stats for those tables. They will be able to do it through OS console.
General guideline is, more frequent/more volume/more diverse changes to the cube data would need more frequent DB stat update.
I have not seen any recommendation till now to run DB stat updates every day, A weekly update itself would be an overkill.
Just having an updated stats alone will not guarantee you an optimized performance on the cube.
I would suggest you search the forums(SCN and database specific forums) and understand how a DB stat helps achieve performance improvement. This will help you implement right approach in your scenario.
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