Transaction monitor

System Architecture III Distributed Objects presents of real time - software considerations; buffering example cd controller; continuous operation; example - routers and other network computing; example - transaction monitor; software reuse - application packages; reuse - objects basic definitions; objects distributed objects; object request broker (orb); interface definition language; distributed objects and the system life cycle

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After completing this lesson, you should be able to do the following: Describe the concept of automaticundo management Create and maintain the automatic managedundo tablespace Set the retention period Use dynamic performance views to check rollback segment performance Reconfigure and monitor rollback segments Define the number and sizes of rollback segments Allocate rollback segments to transactions

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Process Synchronization Background The Critical-Section Problem Peterson’s Solution Synchronization Hardware Semaphores Classic Problems of Synchronization Monitors Synchronization Examples Atomic Transactions Silberschatz, Galvin and Gagne ©2005 .Background Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes Suppose that we wanted to provide a solution to the consumer-producer problem that fills all the buffers.

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