Hence an application designer must evaluate the

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Unformatted text preview: s are categorized according to the way the application uses them. A file management system typically supports the following types of files: 1. Transaction File. A transaction file is used to store input data until it can be processed. For example, in a payroll processing application for generating payslips of employees on a weekly basis, the transaction file will contain weekly data of each employee such as details of hours worked this week, normal and overtime, and if piecework is involved, the quantity of goods made. 2. Master File. A master file contains all the current data relevant to an application. For example, in the payroll processing application mentioned above, the master file will contain the permanent details about each employee (his/her name, address, employee code, pay-rate, income tax rate, and so forth), and also the current gross-pay-to-date total and the tax paid-to-date total. When the payroll program is processed, both the master file and the current week's transaction file are consolidated to generate this week's pay-slips, and the master file is updated in readiness for the following week. 3. Output File. Some applications use multiple programs for data processing. In such applications, often the output produced by one program is used as input to another program. Hence the produced output by the former program is stored in a file known as output file, which is later on used by the latter program. 4. Report File. A report file holds a copy of a report generated by a data processing application in computer-accessible form until it is convenient to print it. It is often advantageous to keep report files instead of paper documents because the files are easier to store and carry. 5. Backup File. A backup file is a copy of a file, created as a safety precaution against loss of data caused due to corruption or inadvertent deletion of the original file. Regular creation of backup files is extremely important. File Organizations File organization deals with the physical organiz...
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