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selection process manageable, we will describe and evaluate fundamental le-design alternatives Most structures used in practice either fall into one of these categories or can be reduced to combinations of these methods These fundamental types are closely related to systems in actual use The collection of these six does not represent a mathematically minimal set of independent le organization methods The selected methods are also reasonable in terms of the secondary criteria, ie, they are fairly reliable and easy to analyze and implement The six fundamental types of les are covered in the chapters as follows: Sections 3-1 and 3-2: Two basic le types, without ancillary access structures: 3-1 The pile 3-2 The sequential le Sections 3-3 1ne 3-4: Two types using indexes to aid access : 3-3 The indexed-sequential le 3-4 The multiply indexed le Sections 3-5 and 3-6: Two further types using computer-speci c methods: 3-5 The direct le 3-6 The multiring le Section 3-7: The principles and performance of sorting les Section 3-8: A summarization of the concepts introduced in this (big) chapter The sections follow a consistent organization: After a general introduction, the initial subsection describes the organization, the next one its use, and the third subsection evaluates its performance This chapter begins with a section on general performance parameters The design of databases requires analysis for the prediction of performance The formulas developed for the a performance evaluation use engineering-style approximations: They concentrate on rst-order e ects The formulas are best viewed as concise descriptions of the behavior of the les under normal conditions The notion used in the formulas is consistent throughout the text; the inside covers or Appendix B can be used to nd the signi cance of the abbreviations employed THE METHOD OF ANALYSIS For the performance analyses a variety of approaches will be used The general approach is to consider the required hardware functions step by step, consider the values of the computing times, c; any seeks, s; rotational latencies, r; and the transfer rates, t or t , applied to the blocks Often functions must be executed repetitively The sum of the values, T , provides the estimate for the cost in terms of time required for a le operation When alternative functions are required within an operation, typically dependent on the locality of the data, we have to resort to case analysis For each choice the probability of using one function on the other is estimated The expected value is found by taking the sum of the probabilities times the cost of each of the k cases, pi Ti | i = 1 k, as illustrated in Eq 3-40 To simplify the analysis ie, Te = some assumptions are made We assume often typical usage ratios of reading versus writing, balanced speed ratios of system components, and commonly seen user behavior Because of variance in these factors the results will be of typical engineering accuracy, say 20% This precision is more than adequate for predicting software performance; today, many implementors only guess the performance and results often di er by orders of magnitude from the expected value As always, any assumptions should be noted during a design process and later veri ed, so that unpleasant surprises are avoided.

Sec 3-0

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Compares a substring of str to a substring within the invoking string The substring in the invoking string begins at indx and is len characters long The substring in str begins at indx2 and is len2 characters long It returns one of the following: Less than zero if *this < str Zero if *this == str Greater than zero if *this > str Compares str to the invoking string It returns one of the following: Less than zero if *this < str Zero if *this == str Greater than zero if *this > str Compares a substring of str to a substring within the invoking string The substring in the invoking string begins at indx and is len characters long The substring in str begins at zero and is len2 characters long It returns one of the following: Less than zero if *this < str Zero if *this == str Greater than zero if *this > str Beginning at indx, copies len characters from the invoking string into the character array pointed to by str Returns the number of characters copied Returns a pointer to the first character in the invoking string Returns true if the invoking string is empty and false otherwise

The restrict (also known as select) and project operators produce subsets of a table Because users often want to see a subset rather than an entire table, these operators are widely used These operators are also popular because they are easy to understand The restrict and project operators produce an output table that is a subset of an input table (Figure 33) Restrict produces a subset of the rows, while project produces a subset of

The consistency of the formulas permits the comparison of expected performance for the fundamental le organizations presented here A nal comparative rating of performance characteristics for the six types of les is given in the introduction to Chap 4 We now introduce general concepts of le organizations and their performance These concepts will apply throughout, but will be speci cally stressed in this chapter A le will have some directory information associated with it, but the bulk of the le contains data records The analyses consider only the data portion of the les The data portion will follow certain design rules, as de ned by the le organization chosen The previous de nition of a le can now be expanded to state A le consists of similar records and has a consistent organization

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