This extraction process provides the users
with a more sophisticated interface with online validation and editing, but it preserves
the flow of data through the entrenched batch systems. While this process
seems costly, it??™s typically more attractive than the major surgery that would replace
older systems. To compound the difficulty, in some cases the documentation of these
older systems is incomplete and the employees who understand the inner workings
have retired or moved on.
204 | Chapter 9: Oracle and Transaction Processing
The financial services industry is a leader in information technology for transaction
processing, so this notion of feeding legacy downstream applications is very common
in banks and insurance companies. For example, users often enter insurance claims
into frontend online systems. Once all the data has been entered, if the claim has
been approved, it??™s extracted and fed into legacy systems for further processing and
payment.
Oracle features such as transportable tablespaces and Streams, discussed in
Chapter 13 of this book, are aimed in part at providing the functionality required by
distributed OLTP systems in a more timely fashion than traditional batch jobs.
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