Structure of Data management system:

These notes attempt to discuss issues that are independent of which operating system strategy is adopted. No substances how the system is structured there are certain problems it should solve. The general structure common to numerous data management systems is presented. Then two particular problems inside the transaction management component are discussed in detail- concurrency control (locking) as well as system reliability (recovery).

This presentation decay the system into four major components-

a) Dictionary- the central arsenal of the description as well as definition of all persistent system objects.

b) Data Communications- supervise teleprocessing lines as well as message traffic.

c) Data Base manager- supervise the in sequence stored in the system.

d) Transaction Management- handles system resources as well as system services such as locking as well as recovery.

Every of these components calls one another and in turn depends on the basic operating system for services.

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