Answered: Which of the following is true? 1) the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Which of the following is true?

1) the 80/20 rule states that 80% of the instructions is excutede and 20% of the instruction is generated.

2) in von Neumann architecture, external bus is for data memory only

Expert Solution

Step 1

80/20 rule:

80/20 rule is also called as pareto principle, and this rule states that 20 % effort is made for generating 80% results.
This rule is also used in marketing, research and finance etc. This rule states that by focusing on the 20 % of its instructions 80% of results are achieved.
This rule is a perception and not a hard and fast mathematical law. this rule does not say that the rest 80% efforts made are worthless or useless. but, the most probable and required results can be achieved by the first 20 % efforts.

Yes, 80 by 20 rule states that 80% of the instructions are executed by generating 20% of instruction.

Step 2

In the von Neumann architecture the external bus is used for transmitting data from one storage unit to another.

Von Neumann external bus is used as:

Data bus: it is used to carry data over the I/O device, processor, primary storage and secondary storage device etc.
Address bus: it carries address of data, between memory and processor.
Control bus: it carries control instruction to control and coordinate all the activities of the system.

Thus, In von Neumann architecture, external bus is not only for data memory only.

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