Answered: data compression"

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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Hi can you help me with these 4 questions please I really appreciate it thank u

Transcribed Image Text:1. Which of the following is NOT true about data compression? Data compression affects the data's integrity only if compressed with a lossy compression technique. b. Data compression is useful when posting on social media platforms. c. Using a lossless data compression, can restore data to its original state. d. It is necessary to understand the different compression techniques as there are trade-offs to using one over another when storing and transmitting compressed files. e. All of the selections are true. a. 2. Banks have all types of online services for their customers. Some documents require a lossless compression while others can be lossy when storing them online for customer access. Select the file that should be saved with lossless compression. a. photo image of check from mobile upload b. bank website photos bank commercials posted on social media d. bank app profile pictures C. е. None of the above. 3. When using a lossless compression, redundant words and/or character pairs are removed and replaced with a single character to represent those repeated characters. If a certain passage originally had 493 characters and the compression algorithm created a key with 37 and a new passage of 308 characters, what percentage of the passage was compressed? a. around 8% b. about 30% c. approximately 62% d. roughly 70% e. Not enough information 4. Which of the following compression techniques reduces the files size the most? a. refiner b. lossless sifter d. lossy C.

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