Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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...

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