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Most bene t factors can only be estimated, but the fact that they are estimates does not at all diminish the importance of assigning quantitative values to all important parameters in a system design The use of speci c, documented, and consistent values for these quantities allows analysis of the decision and the comparison of system and nonsystem alternatives When design decisions are made which are based on unrecorded assumptions, the probability of design errors is high, and correction of assumptions to improve the design is impossible If we have to make very many assumptions, then our conclusions will be mainly of a relative rather than absolute nature This state will become obvious during the estimation process Figure 5-1 provides an overview of the analysis process



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Sec 5-1

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42 8.75 8.75F 132 'JOneS' 'GEN' '132'

Section 5-1 of this chapter deals with the estimation of system use, whereas the three sections following will deal respectively with system bene ts, storage costs, and production costs Section 5-4 includes considerations of multiprogramming, use of multiple processors, and data distribution Section 5-5 presents the problems of integrating these factors and ensuring the robustness of the nal results We will frequently relate the analysis to the seven performance parameters obtained in Chap 3 and listed on the inside covers These parameters describe the following: 1 The required data storage: ntotal R 2 The expected search times: TF , TN , TX 3 The expected update times: TI , TU 4 The time required for reorganizations: TY 5-1 THE ESTIMATION OF SYSTEM USAGE





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In order to extract bene ts out of a database, it has to be used The bene ts which may be obtained, the e ectiveness with which they are obtained, and the cost of the database operation are all related to the load placed on the system The load consists of demands on data storage and on operations requested by the transactions A primary aspect of the load is the volume of stored data required for an e ective operation In many environments the volume of data is expected to increase steadily The estimation of the load placed on the le system in terms of volume is controlled on the number of records n, the total number of attributes a, and the average number of attributes in a record a The lengths of the value elds V and the attribute description elds A also play a role The various le designs will combine these common parameters in di erent ways, so that at this point we are not prepared to evaluate the le size, since the design decision is yet to be made If we cannot contain our anxiousness, we may quickly check the magnitude of the storage demand presented by a pile organization of the proposed data

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DATE '2004-02-09' TIMESTAMP '2004-09-05 11.42.59.00000' INTERVAL '2' SECOND INTERVAL '1-3' YEAR TO MONTH

The retrieval of data elements is the central objective of a le system A transaction may require data from more than one le We stated earlier that a collection of related data forms a database If it is made accessible to a set of transactions, we can speak of a database system The primary objective of database systems is the synthesis of data and, hence, the creation of information Some measure of what this means in terms of the utilization of the le system is required We consider rst the load on systems by data requests for services for operational purposes The operational load is provided by an estimate of the number of service requests to a le made by the transactions in a given period The distribution of these requests over a daily or monthly cycle should also be estimated to determine periods of high demand The load and time of busy intervals are used to verify that the proposed system is adequate at those times

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