DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Expert Solution & Answer
Chapter 24, Problem 1PE
Explanation of Solution
Log-Structured Merge-Tree (LSM Tree):
- The Log-Structured Merge is an important technique used in many modern data stores.
- The LSM tree is a data structure is designed to provide low-cost indexing for files experiencing a high rate of inserts. It is done over an extended period.
- The LSM trees perform better on update queries.
Reason for LSM is preferred:
- Compared to LSM trees, the buffer trees require more random I/O for insert operations. This is the major difference between buffer trees and LSM trees.
- The LSM perform more sequential I/O operations.
- LSM trees are preferred because, for Big Data setting where data is resident on magnetic disks, random I/O is significantly more expensive than sequential I/O.
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Q.1. Architecture performance [10 marks]
Answer
A certain microprocessor requires either 2, 4, or 6 machine cycles to perform various operations.
⚫ (40+g+f)% require 2 machine cycles,
⚫ (30-g) % require 4 machine cycles, and
⚫ (30-f)% require 6 machine cycles.
(a) What is the average number of machine cycles per instruction for this microprocessor?
Answer
(b) What is the clock rate (machine cycles per second) required for this microprocessor to be a
"1000 MIPS" processor?
Answer
(c) Suppose that 35% of the instructions require retrieving an operand from memory which
needs an extra 8 machine cycles. What is the average number of machine cycles per
instruction, including the instructions that fetch operands from memory?
Knowledge Booster
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