Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
Expert Solution & Answer
Book Icon
Chapter 17, Problem 21E

Explanation of Solution

a.

Example of a schedule using pred_read operation:

The Phantom phenomenon occurs when two transactions do not access a common record and yet conflict.

Suppose the given additional operation pred_read(r, P) on relation r with predicate P.

Consider the example of a schedule which depicts the phantom phenomena:

T1T2
pred_read(t, P) 
 

insert(r)

write(B)

commit

read(B)

comm...

Explanation of Solution

b.

Example of a schedule:

Consider the example of a schedule where one transaction makes use of the operation pred_read(r, P) and another transaction deletes a tuple from relation r, and still a phantom conflict is not exhibited:

T1T2
pred_read(t, t...

Blurred answer
Knowledge Booster
Background pattern image
Recommended textbooks for you
Text book image
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Text book image
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Text book image
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
Text book image
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Text book image
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Text book image
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education