A company maintains the stock of six produ Initial stock was as follows: a = 8, b = 32, c = 15, d = 23, e = 8, f = 6. Now consider the following schedule having two transactions T1 and T2: T1: r(a); r(b); T2: r(c); c:= c+10; w(c); T1: (c) r(d); T2: r(d); d:= d-10; w(d); commit; T1: r(e); r(f) Suppose T1 is responsible to calculate the total stock of the company.

A company maintains the stock of six produ Initial stock was as follows: a = 8, b = 32, c = 15, d = 23, e = 8, f = 6. Now consider the following schedule having two transactions T1 and T2: T1: r(a); r(b); T2: r(c); c:= c+10; w(c); T1: (c) r(d); T2: r(d); d:= d-10; w(d); commit; T1: r(e); r(f) Suppose T1 is responsible to calculate the total stock of the company.

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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Concept explainers

Lease option

A lease option is a time and cost-saving option used by information technology (IT) companies that cannot afford large investments. By choosing to lease Software, a firm does not get its ownership directly. Instead, the firm has to pay a fixed cost for a certain period to use the Software, and after the lease period, the company can purchase the Software.

Question

A company maintains the stock of six products.
Initial stock was as follows: a = 8, b = 32, c = 15,
d = 23, e = 8, f = 6.
Now consider the following schedule having
two transactions T1 and T2:
T1: (a); r(b);
T2: r(c); c:= c+10; w(c);
T1: r(0); r(d);
T2: r(d); d:= d-10; w(d); commit;
T1: r(e); r(f)
Suppose T1 is responsible to calculate the total
stock of the company.
i) Identify the problem (lost update / dirty
read/ incorrect summary) of the schedule.
Justify your answer with proper logic.
ii) Solve the problem of the schedule by using
2PL.
(Assume data value iff it is missing/needed]

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