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The development of a substantial database operation is invariably a task which requires the cooperation of a number of diverse individuals The collection will include a large number of potential users, data-analysis specialists, information scientists, experts in various aspects of computing, communication specialists, the future database administrator, and representatives from management, who will be investing resources of the enterprise in the e ort It is not unusual for potential vendors to be included in the initial discussions They can bring considerable experience to bear on problems, but their opinions have to be validated at sites of prior implementations A good deal of knowledge but relatively little experience is currently available in the academic world Experimental research on large databases is di cult because of the large cost and long time scales associated with database system development

The conceptual data modeling phase uses data requirements and produces entity relation ship diagrams (ERDs) for the conceptual schema and for each external schema Data requirements can have many formats such as interviews with users, documentation of existing systems, and proposed forms and reports The conceptual schema should represent all the requirements and formats In contrast, the external schemas (or views) represent the requirements of a particular usage of the database such as a form or report rather than all requirements Thus, external schemas are generally much smaller than the conceptual schema The conceptual and external schemas follow the rules of the Entity Relationship Model, a graphical representation that depicts things of interest (entities) and relationships among entities Figure 24 depicts an entity relationship diagram (ERD) for part of a student loan system The rectangles {Student and Loan) represent entity types and labeled lines {Receives) represent relationships Attributes or properties of entities are listed inside the

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Objective Setting The determining components of a database operation are the users and the data The users determine the objectives of their applications and the semantics of the data determines how the objectives can be satis ed The type, activity, and quantity of users and data have to be quanti ed before any speci c system design can be done The determination of these parameters is a management responsibility A group associated with a speci c system is apt to view users and data needs according to its capabilities, rather than according to the underlying user objectives Documented feedback to management is required when imposed service demands are excessively costly A constantly recurring problem is that programming sta venture opinions about cost and e ectiveness of alternatives without analysis, often using a peremptory approach, sometimes basing opinions on personal interest In order to get a development group composed of diverse individuals moving in the same direction, a de nition of the goal objectives is required Both lower and upper levels of the operational parameters to be achieved have to be speci ed Some quanti ed limits of system performance objectives for an application may be: Response Time: 90% of single-element queries are to take less than 1 s between query entry-completion and begin of response Backup: Backup is to be available for all source data which have been entered more than 3 h ago Backup is to be retained for all data which were deleted less than 3 months ago Deadlock: Less than one deadlock per year should occur Cost: A single element query should cost less than $100 Successive data elements to be obtained at less than $005 each Size: Capability to access 100 000 to 2 000 000 records of size as de ned

~balance() { cout << "Destructing "; cout << name << "\n"; } void set(double n, char *s) { cur_bal = n; strcpy(name, s); } void get_bal(double &n, char *s) { n = cur_bal; strcpy(s, name); } }; int main() { balance *p; char s[80]; double n; int i; try { p = new balance [3]; // allocate entire array } catch (bad_alloc xa) { cout << "Allocation Failure\n"; return 1; } // note use of dot, not arrow operators p[0]set(1238787, "Ralph Wilson"); p[1]set(14400, "A C Conners"); p[2]set(-1123, "I M Overdrawn"); for(i=0; i<3; i++) { p[i]get_bal(n, s); cout << s << "'s balance is: " << n; cout << "\n"; } delete [] p; return 0; }

Objectives de ned and understood at this level form the basis for mutual decision making and have to precede the exploration of the system alternatives Objectives stated without restraint, as instantaneous response, absolute reliability, perfect protection of privacy, can lead to an unbalanced e ort in system implementation

Sec 15-1

CREATE TABLE Student ( StdNo StdName PRIMARY KEY CREATE TABLE Loan ( LoanNo LoanAmt StdNo INTEGER DECIMAL(10,2), INTEGER NOT NULL, NOT NULL, INTEGER CHAR (50), (StdNo) ) NOT NULL,

Ralph Wilson's balance is: 123879 A C Conners's balance is: 144 I M Overdrawn's balance is: -1123 Destructing I M Overdrawn Destructing A C Conners Destructing Ralph Wilson

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