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Database technology is an important subject in Computer Science.
Every large company and nation needs a database to store
information. The technology has evolved from file systems in the
60's, to Hierarchical and Network databases in the 70's, to
relational databases in the 80's, object-oriented databases in the
90's, and to XML documents and NoSQL today. As a result, there is a
need to reengineer and update old databases into new databases.
This book presents solutions for this task. In this fourth edition,
Chapter 9 - Heterogeneous Database Connectivity (HDBC) offers a
database gateway platform for companies to communicate with each
other not only with their data, but also via their database. The
ability of sharing a database can contribute to the applications of
Big Data and surveys for decision support systems. The HDBC gateway
solution collects input from the database, transfers the data into
its middleware storage, converts it into a common data format such
as XML documents, and then distributes them to the users. HDBC
transforms the common data into the target database to meet the
user's requirements, acting like a voltage transformer hub. The
voltage transformer converts the voltage to a voltage required by
the users. Similarly, HDBC transforms the database to the target
database required by the users. This book covers reengineering for
data conversion, integration for combining databases and merging
databases and expert system rules, normalization for eliminating
duplicate data from the database, and above all, HDBC connects all
legacy databases to one target database for the users. The authors
provide a forum for readers to ask questions and the answers are
given by the authors and the other readers on the Internet.
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