The following table presents the lock requests by transactions T1, T2, T3, and T4. S(.) and X(.) stand for 'shared lock' and exclusive lock', respectively. To prevent deadlocks, use a lock manager that uses the Wait-Die policy. Assume the four transactions have priority: T1< T2

The following table presents the lock requests by transactions T1, T2, T3, and T4. S(.) and X(.) stand for 'shared lock' and exclusive lock', respectively. To prevent deadlocks, use a lock manager that uses the Wait-Die policy. Assume the four transactions have priority: T1< T2

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

Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.

Question

The following table presents the lock requests by transactions T1, T2, T3, and T4. S(.) and X(.) stand for shared lock' and `exclusive lock', respectively.
To prevent deadlocks, use a lock manager that uses the Wait-Die policy. Assume the four transactions have priority: T1 < T2 <T3 < T4. Determine which lock request
will be 'granted', 'blocked' or 'aborted'; for 'abort', specify which transaction is aborted, e.g., 'Tj aborts'.
time
t4
S(A)
X(D) | X(C)
t1
t2
t3
t5
to
t7
t8
X(B)
T2
T3
T4
S(C)
X(A)
X(B)
S(D)
O a
g, g, g, T1 aborts, g, T2 aborts, g, g
Ob.
g, g, g, b, g, T2 aborts, g, g
Oc.
g, g, g, T1 aborts, g, b, g, g
O d. g, g, g, T2 aborts, g, T1 aborts, g, g
Clear my choice

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