Time T1 T2 T1 Begin_transaction Begin_transaction Avg = 0 T2 тз | Read(b) T3 Read (a) T4 b = b-10 Read (b) T5 Write (b) Т commit T7 Avg = (a+b)/2 T8 Commit

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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a = 100, b = 50

Identify what problems occur in the table above and provide solutions
using 2PL.

Time T1
T2
T1
Begin_transaction
T2
Begin_transaction Avg = 0
Read(b)
T4 b = b-10
T3
Read (a)
Read (b)
T5
Write (b)
T6
commit
T7
Avg = (a+b)/2
%3D
T8
Commit
Transcribed Image Text:Time T1 T2 T1 Begin_transaction T2 Begin_transaction Avg = 0 Read(b) T4 b = b-10 T3 Read (a) Read (b) T5 Write (b) T6 commit T7 Avg = (a+b)/2 %3D T8 Commit
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