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We wish to design a booking system for a small airline We have studied the operation and can summarize the result as follows: The number of salable items we have is determined by the number of ights between two adjacent points and the number of available seats With 3 aircraft of 70 seats each, which complete 20 ight segments per day, nearly 30 000 units are for sale each week The average ticket sale represents 27 units because people y more than one segment and use return ights The average number of people ying and booking together is 161 A survey shows that 20% of all reservations are subsequently changed During the process of selling a ticket, typically three possible ight schedules are explored The load L on the system is stated in terms of fetch and get-next accesses for ticket sales 30 000 12LF = 120 3 = 25 000 27 161 LN = 30 000 120 3 LF = 83 000 We have to note for the subsequent le-design phases that additional segments of a ight schedule and additional people on a ight are accommodated through get-next searches

The estimates used in the example may be rough, but it is important that they have been made and have been written down A change in projected system usage can be accommodated only if the original assumptions are known In addition, it is desirable to redo the complete evaluation for both high and low usage estimates in order to be assured that the e ects of misestimation are neither fatal in terms of cost nor disastrous in terms of performance

Sort on GROUP BY columns Compute aggregates and reduce each group to 1 row Restriction on HAVING conditions

After the call to print_upper( ), the contents of array s in main( ) have also been changed to uppercase If this is not what you want, you could write the program like this:

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Load for Information Retrieval For a database system which is to produce primarily information, rather than produce data to control sales of services or equipment, the estimation of the load is considerably more di cult The extent of its use is mainly dependent on user satisfaction Satisfaction in turn depends on human factors, utility, and performance A retrospective health-status report on a patient loses its value quickly if the e ort to obtain it is greater than the desire of the physician to have the past record available during the encounter with the patient Such a health report only occasionally contains information which is not obvious to the physician at the time of the visit The average bene t may be quite low

For information systems the estimation of load may require investigations of similar systems If no similar situations exist, the operation of a pilot model can provide data for load projections In a pilot model, di erent technology can be employed, since it is allowable to operate at much higher unit cost per query in order to minimize the initial investment, while obtaining performance parameters which match the intended nal form of the proposed system A prediction based on a pilot model requires re ection and insight when the pilot model was operated with a limited database The designer can only conjecture how system bene ts, and hence usage patterns, are related to le size A careful analysis of the information-producing potential and the power this information provides for the users may be required Usage patterns also change over time A exible design is needed to allow the system to grow and adapt

TABLE 413 Partial Result of Step 1 for First Two Offering Rows (1111 and 2222)

6:

Sec 5-1

The outcome of the above considerations should be the frequency of all types of retrieval: Fetch requests LF Requests for next records LN Exhaustive searches LX both in terms of averages over long periods (days, weeks, or months), as well as the maximum rates for short, high-intensity periods that may be expected

StdSSN 111-11-1111 111-11-1111 111-11-1111 111-11-1111 222-22-2222 222-22-2222 333-33-3333 111-11-1111 111-11-1111 111-11-1111 111-11-1111 222-22-2222 222-22-2222 333-33-3333

void print_upper(char *string); int main(void) { char s[80]; gets(s); print_upper(s); printf("\ns is unchanged: %s", s); return 0; } void print_upper(char *string) { register int t; for(t=0; string[t]; ++t) putchar(toupper(string[t])); }

Update Load The frequency of updates of the system also will be considered in the estimation of system volume We wish at this point to break down the update frequencies into types of tasks that represent:

Addition of a new record LI Change of a eld in a record LU Extension of a record LZ Deletion of a record LD

numbers beginning with IS match this condition Table 4 1 4 s h o w s that the result o f the cross product (35 rows) is reduced to six rows 3 The third step sorts the result o f step 2 by the columns specified in the G R O U P B Y clause The G R O U P B Y clause indicates that the output should relate to groups o f rows

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