Database design by Gio Wiederhold

By Gio Wiederhold

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2-1-4 Large-Capacity Storage Devices To provide mass storage at low cost, two approaches are followed: 32 Hardware and Its Parameters 1 Increased storage capacity per unit to reduce storage cost per character 2 Reduction of dependence on manual operation and mechanical parts to achieve more reliability and compactness Magnetic disks are nearing their limits of storage capacity because of limits in the size of the magnetizable area, which is determined by the surface coating and by the physical dimensions of the read-write heads.

The number of pages actually required will vary from slice to slice. The pages are generally brought in on demand. Pages which show heavy recent usage are kept in core memory if possible. Paging capability can also aid the allocation process when multiprogramming in general. 1-7-5 Transaction Processing The most important operating system approach for interactive databases is called transaction processing. This method assumes that the computations are naturally small, in terms of both space and time.

The data will be shifted to the edges where amplifiers and connectors extract the data. Another alternative considered is to have the data processed within the arrays so that only results will have to be transferred out of the semiconductor chips. Economies can accrue because the space required for access paths to the data and for control of individual bits of storage can be minimized. One specific architecture of this type, associative memory, is presented in Chap. 12. Semiconductor technology proposed for secondary storage includes common MOS memory, charge-coupled devices, and shift registers.

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