By Dimitris N. Chorafas, Heinrich Steinmann
Whereas the appearance of desktops, communications and software program in all features of commercial and has created a increase in telecommunications, it has additionally generated a spot within the figuring out of the way most sensible to attach, community and capitalize at the starting to be variety of company databases at present in use. This publication is designed to fill this severe info hole by means of supplying readers with the basics essential to combine heterogeneous databases. in line with a study venture that concerned 70 major businesses and 250 technologists, the textual content offers an research of the way cross-database suggestions may be successfully constructed. Written through specialists with approximately forty years of expertise within the laptop and communications fields, it may end up an invaluable reduction to all these curious about subtle details know-how operations. The e-book offers uncomplicated heritage info and functional implementations and offers concepts for making the most of the additional worth precept. Emphasis is put on the constructing box of dealing with lengthy transactions
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Extra resources for Solutions for Networked Databases. How to Move from Heterogeneous Structures to Federated Concepts
Sample text
Vertical partitioning also provides a limited form of fault tolerance in the sense that the loss of a single database computer does not necessarily halt all transaction processing. If we partition the database on the basis of a number of attributes corresponding to main accounts or client entities, this will be vertical partitioning. By contrast, if the partitioning job is done along the lines of functional subsets, this will be characterized as horizontal partitioning. The possibility of both vertical and horizontal partitioning has to be carefully studied.
Developing a Corporate Database Concept With reliability statistics available, based on the measurement of performance, the favored parameter-characterized fault tolerance is avaiJabiJity. At the device level, with MTBF and MTTR, the availability of a component is given by: M T B F * A ·ι u-w Component Availability = MTBF + MTTR Estimates of the MTBF and MTTR of each component should be known before availability can be estimated. This is just as valid for system availability: c * A ·ι u^-, System Availability MTBSI MTBSI + MTOSI Availability of a fault tolerant database system can be defined by assuming that the entire networked database should be available at any time, from any place, for access by authorized users.
Some of them are long transactions, and their number is growing. COVIA started by running its long transactions under the MVS operating system and DB2, on an IBM 3090/600. They executed at the rate of less than 20 per second. To bring this example to the point of absurdity, if all of the 100,000 transactions per second were long transactions, COVIA would have needed 5,000 IBM 3090/600 mainframes at about $5 million apiece. As a result, COVIA benchmarked a full application with all inputs/ outputs on a new supercomputer (by Kendall Square Research).