Learn more with dummies

Enter your email to join our mailing list for FREE content right to your inbox. Easy!

Additional EII Services for Data Warehousing

By Thomas C. Hammergren

Your virtual data warehousing environment includes services that a single database would handle in a centralized environment. These true middleware services complement the traditional data warehousing middleware, such as extraction and transformation:

  • A unified metadata service: Users see a single logical view of the environment’s contents without having to know the location and particulars of each component.

  • A directory service: Individual components within the environment, even if they’re relocated or otherwise modified.

  • Security services: These services handle permissions, authentication, and other security needs in a distributed environment.

  • Synthesis services: Unlike traditional Internet usage, for example, where each hit returns information that probably won’t have to be correlated with information from other hits, a virtual data warehouse might have to combine facts from one component with facts from another.

    This figure shows a synthesis service component within the virtual data warehouse.

    image0.jpg

    If the data warehousing environment, which “knows” that it’s virtually (remotely) accessing data from multiple sources, has a component that handles the synthesis of results from the other components, the responsibility for consolidating these independent results sets can be offloaded from the requesting business intelligence tool.

  • Transaction-management services: In addition to the synthesis service, which is a type of transaction-management function, these services provide routing, load balancing, conflict resolution, and other functions necessary to ensure data integrity. (Yes, you need these services, even in a supposedly read-only environment.)