A=......................? B Your Comment: .?
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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Transcribed Image Text:T1: Move $100 from account (A) to account (B).
T2: Compute the total amount in all accounts and return it to the application.
The initial values for A, B for all the following schedules are 1000, 1000
T1
T2
BEGIN
BEGIN
A=A-100 ECHO
B=B+100 A+B
COMMIT COMMIT
S3
T1
BEGIN
X-LOCK(A)
R(A)
A=A-100
W(A)
X-LOCK(B)
R(B)
B=B+100
W(B)
UNLOCK(A)
UNLOCK(B)
COMMIT
T2
BEGIN
S-LOCK(A)
R(A)
S-LOCK(B)
R(B)
UNLOCK(A)
UNLOCK(B)
ECHO A+B
COMMIT
A=.....................? B=
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