Differentiate between distributed data processing and time-sharing.
During data entry, Anne typed the letter S instead of 5. What type of error is this? (1mark)
What is the difference between a logical file and a physical file?
Distinguish between real-time and distributed operating systems (KCSE 2018)
Distinguish between real time processing and interactive processing
Describe the difference between distributed and sequential processing on how they process instructions
List Three file organisation methods in a computer
State advantages of batch processing
State four threats that compromise data integrity and state ways that can be used to minimise these threats
State four threats that compromise data integrity
How threats to data integrity can be minimised:
State what is meant by each of the following modes of data processing
(i) Batch processing.
(ii) Real-time processing.
(iii) Online processing.
(iv) Off-line processing.
(i) Jobs collected together for processing at a later time
(ii) Output produced quickly enough to affect the next input
(iii) User has direct contact with the processor
(iv) User cannot communicate directly with the processor
Explain how the techniques of
are used to ensure that the stored data is as accurate as possible.
Dual input of data
Rules are given to the processor
Drop-down list/radio buttons
When a new student is enrolled, a new record is added to the file immediately. The examination grades of all students are updated twice a year. Discuss the processing implications of these two requirements.
- Data input on line
- Individual records validated
- Speed mismatch implications
- Indexes updated immediately
- Data input twice
- Off line
- Run as a batch
- At otherwise downtime
State two reasons why the data in fields such SEX field in a database should be coded.
Lucy wrote: “I should validate the input into my database by typing in the same data twice”.Why was her statement incorrect?
Distinguish between transcription and transposition types of errors and give an example of each (4mks)
Transcription Errors: Transcription errors involve the incorrect entry of data due to mistakes made during the copying or typing process. These errors can occur when transferring information from one source to another.
Transposition Errors: Transposition errors specifically refer to errors where the order of characters or digits is accidentally reversed or swapped. This can happen during manual data entry or when processing information.