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# Lesson 2 data processing

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### Lesson 2 data processing

1. 1. Data Processing<br />Lesson 2<br />
2. 2. 2 – 1 AREAS OF DATA PROCESSING<br />Business Data Processing<br />Scientific Data Processing<br />2 – 2 DATA PROCESSING OPERATIONS<br />Recording<br />Verifying<br />Duplicating<br />Classifying<br />Calculating<br />
3. 3. Calculating <br />Summarizing and Reporting<br />Merging<br />Storing<br />Retrieving<br />Feedback<br />
4. 4. 2-3 METHODS OF PROCESSING DATA<br />Batch Processing<br />On-line Processing<br />Real-time Processing<br />Distributed Processing<br />
5. 5. 2-1 AREAS OF DATA PROCESSING<br />Business Data Processing ( BDP)<br />It is characterized by the need to establish , retain, and process files of data for producing useful information.<br />It involves a large volume of input data ,limited arithmetical operations <br /> and relative large volume of output.<br />
6. 6. 2-1 AREAS OF DATA PROCESSING<br />Scientific Data Processing ( SDP)<br />In science, data processing involves a limited volume of input and many logical or arithmetic calculations.<br />
7. 7. 2-2 Data Processing Operations<br />Recording – refers to the transfer of data unto some form or document. It relates to the documentation of intermediate figures and facts resulting from calculations <br />Verifying – the checking of any possible errors in the recorded data.<br />
8. 8. 2-2 Data Processing Operations<br />Duplicating – reproducing the data unto many forms of documents.<br />Classifying – identifying and arranging items with like characteristics into groups or classes .<br />Sorting – arranging data in a specific order<br />Calculating – the arithmetic manipulation of data.<br />Summarizing and Reporting <br /><ul><li>Summarizing – reducing masses of data to a more usable form.</li></li></ul><li>Merging – this operation takes two or more sets of data and puts them together to form a single sorted set of data.<br />Storing – placing similar data into files for future reference .<br />Retrieving – recovering stored data and / or information when needed.<br />Feedback – is the comparison of the output and the goal set in advance; any discrepancy is analyzed, corrected and fed back to the proper stage in the processing operation.<br />
9. 9. 2- 3 Methods of Processing Data <br />Batch Processing – is a technique in which data to be processed or program to be executed are collected into groups to permit convenient, efficient and serial processing.<br />On-line Processing - in one which uses devices directly connected to the CPU either for data entry or inquiry purposes. <br />
10. 10. 2- 3 Methods of Processing Data <br />Real-time processing is a method of data processing which has the capability of a fast response to obtain data from an activity or a physical process , performs computations and return a response rapidly enough to affect the outcome of the activity or process. <br />Distributed Processing is the most complex level of computer processing which generally consists of remote terminals linked to a large central computer system to help the user conduct inquiries about accounts , process jobs or other data processing operations<br />
11. 11. Advantages of distributed processing system<br />Central processor time is reduced<br />Sophisticated computers and a growing library of applications program may be immediately available to end users whenever needed<br />Skilled professionals are available to help users develop their own specialized applications<br />Managers may be able to react rapidly to new development and interact with the system in order to seek solutions to unusual problems.<br />
12. 12. Possible disadvantages are: <br />The reliability and cost of the data communications facilities used and the cost and quality of the computing service received , ay be disappointing in some cases.<br />Input / output terminals are often rather slow and inefficient.<br />Provisions for protecting the confidentiality and integrity of user programs<br />