Functional components of database management system:
(i) Authorization
and integrity manager, which tests for the satisfaction of integrity
constraints and checks the authority of users to access data.
(ii) Transaction
manager which ensures that the database remains in a consist ant state despite
system failures.
(iii) File manager
which manages the allocation of space on disk storage and the data structures
used to represent information stored on disk.
(iv) Buffer manager
which is responsible for fetching data from disk storage into main memory and
deciding what data to cache in main memory. The manager is a critical part of
the database system, since it enables the database to handle data sizes that
are much larger than the size of main memory.
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