Download e-book for iPad: Database Concurrency Control: Methods, Performance, and by Alexander Thomasian (auth.)

By Alexander Thomasian (auth.)

ISBN-10: 144195161X

ISBN-13: 9781441951618

ISBN-10: 147572473X

ISBN-13: 9781475724738

Database Concurrency keep an eye on: tools, functionality and Analysis is a evaluate of advancements in concurrency regulate tools for centralized database platforms, with a short digression into allotted databases and multicomputers, the emphasis being on functionality.
the most pursuits of Database Concurrency keep watch over: tools, Performanceand Analysis are to succinctly specify a number of concurrency keep watch over equipment; to explain versions for comparing the relative functionality of concurrency regulate equipment; to show troublesome areas in past functionality analyses; to introduce queuing community types to guage the baseline functionality of transaction processing structures; to supply insights into the relative functionality of transaction processing platforms; to demonstrate the appliance of easy analytic the right way to the functionality research of assorted concurrency regulate equipment; to study transaction versions that are meant to alleviate the impact of lock competition; to supply directions for making improvements to the functionality of transaction processing structures as a result of concurrency keep an eye on; and to show parts for additional research.
This monograph might be of direct curiosity to computing device scientists doing learn on concurrency keep an eye on equipment for prime functionality transaction processing platforms, designers of such structures, and pros taken with enhancing (tuning) the functionality of transaction processing systems.

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Download e-book for kindle: Database Concurrency Control: Methods, Performance, and by Alexander Thomasian (auth.)

Database Concurrency keep an eye on: tools, functionality and research is a overview of advancements in concurrency regulate equipment for centralized database platforms, with a short digression into disbursed databases and multicomputers, the emphasis being on functionality. the most ambitions of Database Concurrency keep an eye on: tools, Performanceand research are to succinctly specify a number of concurrency keep an eye on equipment; to explain versions for comparing the relative functionality of concurrency keep watch over tools; to indicate areas of difficulty in past functionality analyses; to introduce queuing community types to guage the baseline functionality of transaction processing structures; to supply insights into the relative functionality of transaction processing platforms; to demonstrate the appliance of easy analytic the way to the functionality research of assorted concurrency keep an eye on equipment; to check transaction versions that are meant to alleviate the impact of lock rivalry; to supply guidance for making improvements to the functionality of transaction processing structures as a result of concurrency keep an eye on; and to indicate components for extra research.

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Extra resources for Database Concurrency Control: Methods, Performance, and Analysis

Sample text

Figure 3 in [WHMZ94]). In fact, simulationll results show that the effective throughput characteristic remains flat up to M' > M, before dropping. 2 in Chapter 113 that the system is more susceptible to thrashing as M is increased beyond M. , This is an instance of taking into account passive resources, such as the main memory in the analysis. In fact database locks also belong to this category. , an 1/0 path (channel) is required in order to transmit data to/from disks [LZGS84). 9 That this is so can be ascertained from the fact that the transition rates for both hierarchical models are the same, which implies the same mean number of transactions and mean response time.

Ii) The system is lock contention bound and it thrashes before the hardware resource bound is attained. In the laUer case the effective throughput (T(M» increases as more transactions are activated and the peak throughput is attained when M,,( = M(1 is at its maximum. 3 [Thom93b). 3 [Thom93b). 6. 4W 1• The P» a Chapter 3: Standard Locking and Its Performance 42 effeetive throughput eharaeteristie (T(M), M ~ 1) inereases with M, reaehes a " 1\ _ A 1\ peak at

Setting q = 1/k such that the size is equal to fixed size transactions of size k. , the Pe in one case is twiee that of the other case [ThRy91]. In addition PD(2) for the geometrie distribution is an order of magnitude higher than that for fixed size transactions [ThRy91]. ,.... 9) where the approximation ignores the residual delay in the step in which the lock conflict occurred. It is shown in [Thom93b] that A~1 for the geometrie transaction size distribution. 4 Deadlock Resolution Policies A comprehensive review of work related to lock conflict and especially deadlock resolution policies appears in [ACMc87].

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Database Concurrency Control: Methods, Performance, and Analysis by Alexander Thomasian (auth.)


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