On the positive side, having all product service and support come from a single vendor provides some consistency and simplification. However, most e-business installations today are necessarily heterogeneous - with the need to coordinate transactions or manage connectivity across several dissimilar enterprise systems. In those typical cases, you would need an application server that provides a higher level of openness and connection management across all of those systems. Vendors that primarily offer a database product (a large part of their business) tend to focus their application servers on exploiting and leveraging their own databases, rather than addressing a more open and flexible e-business platform solution.
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