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  Data management system as subsystem

Data management system as subsystem:

It has been the new experience of general-purpose operating systems that the operating system is extended or enhanced by some ‘application program’ like a data management system or a network management system. All of these systems often have very clear ideas about resource management and scheduling. It is nearly impossible to write such systems unless the basic operating system

a) Permits the subsystem to appear to users as an extension of the basic operating system.
b) Permits the subsystem to participate in major system events such as system shutdown/restart, process termination,....

To manage with these problems operating systems have either made system calls indistinguishable from other calls (example MULTICS) or they have reserved a set of operating systems calls for subsystems (example user SVCs in OS/360.) These two approaches address merely the first of the two problems above.

The notion of subsystem is set up to capture the second notion. For illustration in IBM's operating system VS release 2.2 notifies each known subsystem at significant system events (example start-up, memory failure, checkpoint,...) usually a user might install a Job Entry Subsystem, a Text Processing Subsystem, a Network Subsystem and perhaps several different Data Management Subsystems on the same operating system, The basic operating system provides as a coordinator among these sub-systems.

a) It exceeds calls from users to these subsystems.
b) It broadcasts events to every subsystems.

The data manager proceeds as a subsystem of the host extending its basic facilities.

The data management component is in twirl comprised following is a partial list of the components in the bottom half of the data base component of System R:

a) Catalog manager keep up directories of system.

b) Call analyzer controls system entry-exit.

c) Record manager take out records from pages.

d) Index component maintains catalogue on the database.

e) Sort component preserve sorted versions of sets.

f) Loader performs bulk placing of records into a file.

g) Buffer manager maps database pages to as well as from secondary storage.

h) Performance monitor maintain statistics about system performance and state.

i) Lock component retains the locks (synchronization primitives).

j) Recovery manager executes the notion of transaction COMMIT, ABORT, and handles system restart.

k) Log manager retain the system log.

Notice that archaic forms of these functions are present in most general-purpose operating systems. In the future one may perhaps expect to see the operating system subsume most of these data management functions.

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