is responsible for concurrency control?  For Reference Only.  Please do not answer. 6b.) How is this feature used to resolve conflicts?  For Reference Only.  Please do not answer.   Please answer this particular question below.

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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6a.) What DBMS component is responsible for concurrency control?  For Reference Only.  Please do not answer.

6b.) How is this feature used to resolve conflicts?  For Reference Only.  Please do not answer.

 

Please answer this particular question below.

Create a simple transaction log (using the format shown in Table 10.14) to represent the actions of the transactions in Problems 6a and 6b.


TABLE 10.14
WAIT/DIE AND WOUND/WAIT CONCURRENCY CONTROL SCHEMES
TRANSACTION
REQUESTING LOCK OWNING LOCK
T1 (11548789)
T2 (19562545)
T2 (19562545)
TRANSACTION WAIT/DIE SCHEME
T1 (11548789)
WOUND/WAIT SCHEME
T1 waits until T2 is completed and T1 preempts (rolls back) T2.
T2 releases its locks.
T2 dies (rolls back).
T2 is rescheduled using the same
time stamp.
•
T2 is rescheduled using the
same time stamp.
•
T2 waits until T1 is completed
and T1 releases its locks.
Transcribed Image Text:TABLE 10.14 WAIT/DIE AND WOUND/WAIT CONCURRENCY CONTROL SCHEMES TRANSACTION REQUESTING LOCK OWNING LOCK T1 (11548789) T2 (19562545) T2 (19562545) TRANSACTION WAIT/DIE SCHEME T1 (11548789) WOUND/WAIT SCHEME T1 waits until T2 is completed and T1 preempts (rolls back) T2. T2 releases its locks. T2 dies (rolls back). T2 is rescheduled using the same time stamp. • T2 is rescheduled using the same time stamp. • T2 waits until T1 is completed and T1 releases its locks.
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