NET
leads some firms to J2EE, while others prefer the tight integration of Microsoft??™s
offerings. A detailed discussion of the relative merits of J2EE and .NET, and application
server technology in general, is beyond the scope of this book. Suffice to say that
application servers play an extremely important role in today??™s systems environment,
and database management personnel need to understand N-tier systems
architecture.
* TP monitors usually control transactions using the X/Open Distributed Transaction Processing standard
published by the X/Open standards body. A database that supports the XA interface can function as a
resource manager under control of a TP monitor, which acts as a transaction manager.
210 | Chapter 9: Oracle and Transaction Processing
Figure 9-4 depicts an N-tier system with a client, web server, application server, and
DBMS server.
The Grid
Oracle Database 10g introduced focus on another architecture variation, grid
computing. The actual topology of the grid is not relevant to the discussion in this
chapter, because the point of the grid is to provide an extremely simple user interface
that transparently connects to a highly flexible source of computing power.
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