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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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Similar questions

1) Given an O/S with soft timers using a single clock, consider a situation where the event list looks like this: Current time = 4105; Next Signal = 6; Clk Header → 6 → 1 → 3 → 12 → 5 a. What will current time be when the “12” signal is dispatched = b. At time 4113 a new signal arrives to be scheduled for 4125, fill in the following to reflect this signal being added at that time: Current time = ; Next Signal = ; Clk Header → 2) Given a disk with 100 tracks, Consider the following disk request sequence (track numbers): 45, 20, 90, 10, 50, 60, 80, 25, 70. The initial position of the R/W head is on track 50. Determine the distance that will be traversed by the R/W head when the Shortest Seek Time First (SSTF) algorithm is used and the Elevator algorithm (note -the Elevator algorithm will move towards 100 when it starts execution). Which algorithm will move the fewest tracks , SSTF or Elevator: , and by how many fewer tracks: tracks less than the other algorithm.
2. We examine how pipelining affects the clock cycle time of the processor. Problems in this exercise assume that individual stages of the datapath have the following latencies: IF ID EX МЕМ WB 200 ps 300 ps 150 ps 250 ps 200 ps Also, assume that instructions executed by the processor are broken down as follows: alu (i.e. add, sub,...) beq Iw sw 45 % 20 % 20 % 15% a. What is the clock cycle time in a pipelined and non-pipelined processor?
Let there be four fog nodes F1, F2, F3, F4, connected with several IoT devices. The data generated from the IoT devices can be processed either in single or multiple fog nodes. The Fog node can accommodate up to 20 GB, 90 GB, 28 GB, and 46 GB respectively. Further these Fog nodes F1, F2, F3, F4 take 12µs, 18 μs, 28 us, and 22 us to complete 10 GB task. A cloud architecture is also available to execute different tasks, it can process 20 GB of task in 8 us. An IoT device requires 246 GB of data. The time taken to transmit data packets to the cloud is longer than the time taken to transmit data packets to fog nodes. However, device is associated with a critical application. Assume that the device can split the data into multiple segments and segments can be assigned among the fog nodes and the cloud for processing. For the given scenario, compute the total time required to process 246 GB of data.

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