Do your research before signing up. There are many options when it comes to dashDB and you should try to anticipate growth. However, with compression, I find most can leverage the 1TB dedicated environment.

I was not involved in the licensing but I'd advise doing your best comparison with similar platforms. If you are looking to go 100% IBM (IBM Cognos and other IBM tools as well as cloud database and analytics), it should be easier from the support and contractual standpoint.

If you know your data is large to begin with and will grow quickly, dashDB pricing is in comparison to the other service providers in the market.

If your going to go with warehouse DB/dashDB, use the cloud or Sailfish version.