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By D. A. Bell

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5. Incidentally, IV2 and IV3 show how this measure allows the frequency of a function to override its urgency in some cases. Function 2 has a greater IV, despite being less urgent than Function 3, owing to its higher frequency. This state of aifairs may or may not be desirable in a particular environment; we believe that this is a decision best left to the individual DBA who can alter the coefficients in the formula for IV to reflect local preferences. Definition 2: to calculate the associativity, AR, between two relations accessed during the execution of the functions considered we use the formula: AR = Σ{(ΐν/) χ (no of link occurrences between relations used in evaluation of/)} where the summation is over all functions, /, using link access mechanisms between the two relations.

The two aspects have been approached in different ways and appropriate models and tools have been provided for each aspect. Different levels of design have been suggested: user requirement analysis, conceptual design, logical design and physical design (BOU4). These abstract levels intend to make their methods as independent as possible, either of a special software and hardware support or, of any special domain of application. At each level, several methods and tools have been developed. Generally, these methods use one or several of the following four categories of tool: manual tools, algorithmic tools, interactive tools and intelligent tools.

Archiving may use either the utility supplied as part of the DBMS, or the dump/restore facilities—VSAM Back-up/Restore or DDR—offered by the host operating systems. Databases, DBS PAC Es, tables, indexes and views The SQL/DS database is divided into a number of DBSPACEs, each of which may have different characteristics as regards size, public or private accessibility and allocation to data storage devices. The physical I/O of data pages is handled by standard operating system software. DBSPACEs are stored in DBEXTENTs which are implemented as VSAM Entry Sequence Data Sets under VSE, or as CMS mini-disks in the VM environment.

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