By Philip Bernstein, Vassos Hadzilacos, Nathan Goodman
This ebook is set ideas for concurrency keep an eye on and restoration. It covers options for centralized and allotted computers, and for unmarried reproduction, multiversion, and replicated databases. those thoughts have been built by means of researchers and approach designers mostly drawn to transaction processing structures and database structures. Such platforms needs to technique a comparatively excessive quantity of brief transactions for information processing. instance functions contain digital money move, airline reservation, and order processing. The innovations are priceless for different forms of functions too, reminiscent of digital switching and computer-aided layout - certainly any software that calls for atomicity and reliability of simultaneously executing courses that entry shared facts.
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Additional info for Concurrency Control and Recovery in Database Systems
This is because serial histories must be complete by definition, and two histories can be equivalent only if they contain the same set of operations. But even assuming for the moment that we did not insist on serial histories being complete, we would still have a problem-a problem of substance and not mere definition. Namely, an incomplete execution of a transaction does not necessarily preserve the consistency of the database. Thus, serializability would be an inappropriate correctness condition if it merely stated that a history be computationally equivalent to a serial execution of some possibly partial transactions, since such a history does not necessarily represent a consistency preserving execution.
The theory gives precise properties that a history must satisfy to be serializabIe. Transactions We begin our development of serializability theory by describing how transactions are modelled. As we said in Chapter 1, a transaction is a particular execution of a program that manipulates the database by means of Read and Write operations. From the viewpoint of serializability theory, a transaction is a representation of such an execution that identifies the Read and Write operations and indicates the order in which these operations execute.
Thus, serializability would be an inappropriate correctness condition if it merely stated that a history be computationally equivalent to a serial execution of some possibly partial transactions, since such a history does not necessarily represent a consistency preserving execution. We are therefore Ied to a slightly more complex definition of serializability. Although more complex, the definition is still natural and, most importantly, sound. A history H is serializable (SR) if its committed projection, C(H), is equivalent to a serial history H,.