Neco 2020 Data Processing Question 50
Practice objective / multiple choice question 50 from the 2020 Neco Data Processing examination.
A file holds 10,000 records, each 100 bytes long, on a disk whose block size is 4,096 bytes. The system uses an indexed‑sequential access method (ISAM) with a single‑level primary index of 200 entries (each entry 12 bytes). The probability that a requested index block is already in cache is 0.25. Disk seek time = 5 ms, rotational latency = 4 ms, and transfer time per block = 0.1 ms. Compute the average time (in milliseconds, to two decimal places) required to retrieve a randomly requested record.
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About This Question
This is Neco 2020 Data Processing Question 50. It is one of the objective questions from the 2020 Neco Data Processing examination.
Difficulty level: Medium .
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