
330 Introduction to the New Mainframe: z/VSE Basics
databases by reorganizing and restructuring them and facilities to provide
diagnostic and statistic (performance) information.
12.11 Summary
Data can be stored in a flat file, but this usually results in lots of duplication,
which may result in inconsistent data. Therefore, it is better to create central
databases, which can be accessed (for reading and changing) from various
places. The handling of consistency, security, and so on, is done by the
database management system. The user/developer does not need to worry
about it.
IBM DB2 implements the relational principles, where the fundamental ...