Question #6 6a.) What DBMS component is responsible for concurrency control? 6b.) How is this feature used to resolve conflicts? 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.
Question #6 6a.) What DBMS component is responsible for concurrency control? 6b.) How is this feature used to resolve conflicts? 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.
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
Related questions
Question
Question #6
6a.) What DBMS component is responsible for concurrency control?
6b.) How is this feature used to resolve conflicts?
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.
Transcribed Image Text:**Table 10.14: Wait/Die and Wound/Wait Concurrency Control Schemes**
This table illustrates the behavior of two concurrency control schemes: Wait/Die and Wound/Wait, used to manage transactions in a database system.
**Columns:**
- **Transaction Requesting Lock:** Shows the transaction identifier (T1 or T2) that is requesting a lock.
- **Transaction Owning Lock:** Displays the transaction identifier (T1 or T2) that currently owns the lock.
**Schemes:**
1. **Wait/Die Scheme:**
- If **T1 (11548789)** requests a lock held by **T2 (19562545)**:
- T1 waits until T2 completes and releases its locks.
- If **T2 (19562545)** requests a lock held by **T1 (11548789)**:
- T2 rolls back (dies).
- T2 is rescheduled using the same timestamp.
2. **Wound/Wait Scheme:**
- If **T1 (11548789)** requests a lock held by **T2 (19562545)**:
- T1 preempts (rolls back) T2.
- T2 is rescheduled using the same timestamp.
- If **T2 (19562545)** requests a lock held by **T1 (11548789)**:
- T2 waits until T1 completes and releases its locks.
This table is critical for understanding strategies employed to prevent deadlocks in a database system by either allowing a process to wait or forcing it to rollback and restart.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Recommended textbooks for you
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education