Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 6, Problem 6.16RQ
Program Plan Intro
Two-phase locking:
The process in which the locks are acquired during the growing phase and released in a shrinking phase is called two-phase locking.
- Serializability is the process of processing concurrent transaction which can be achieved through one of the number of different means.
- One way of achieving serializability is two-phase locking.
- Using this strategy, locks can be applied on transactions. When one of the locks is released first, no other locks can be applied on that particular transaction.
- It prevents deadlock which occurs in distributed system.
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How does releasing all locks at the end of a transaction relate to two-phase locking?
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Chapter 6 Solutions
Database Concepts (7th Edition)
Ch. 6 - Prob. 6.1RQCh. 6 - Explain how database administration tasks vary...Ch. 6 - Prob. 6.3RQCh. 6 - Prob. 6.4RQCh. 6 - Prob. 6.5RQCh. 6 - Prob. 6.6RQCh. 6 - Prob. 6.8RQCh. 6 - Prob. 6.9RQCh. 6 - Prob. 6.10RQCh. 6 - Prob. 6.11RQ
Ch. 6 - Prob. 6.12RQCh. 6 - Prob. 6.13RQCh. 6 - Prob. 6.14RQCh. 6 - Prob. 6.15RQCh. 6 - Prob. 6.16RQCh. 6 - Prob. 6.17RQCh. 6 - Prob. 6.18RQCh. 6 - Explain the benefits of marking transaction...Ch. 6 - Explain the use of the SQL transaction control...Ch. 6 - Prob. 6.21RQCh. 6 - Describe statement-level consistency.Ch. 6 - Prob. 6.23RQCh. 6 - Prob. 6.24RQCh. 6 - Prob. 6.25RQCh. 6 - Prob. 6.26RQCh. 6 - Prob. 6.27RQCh. 6 - Explain what serializable isolation level is. Give...Ch. 6 - Explain the term cursor.Ch. 6 - Prob. 6.30RQCh. 6 - What is the advantage of using different types of...Ch. 6 - Explain forward-only cursors. Give an example of...Ch. 6 - Explain static cursors. Give an example of their...Ch. 6 - Prob. 6.34RQCh. 6 - Prob. 6.36RQCh. 6 - Prob. 6.37RQCh. 6 - Describe the advantages and disadvantages of...Ch. 6 - Prob. 6.40RQCh. 6 - Prob. 6.41RQCh. 6 - Prob. 6.42RQCh. 6 - Prob. 6.44RQCh. 6 - Prob. 6.45RQCh. 6 - What is the advantage of making frequent...Ch. 6 - Summarize a DBAs responsibilities for managing...Ch. 6 - Prob. 6.48RQCh. 6 - Prob. 6.49RQCh. 6 - Prob. 6.50E
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- What is the key difference between trying to avoid a deadlock and trying to prevent one from occurring?arrow_forwardA new timestamp is assigned to a transaction that is rolled back in compliance with the timestamp ordering. Why isn't it able to keep the prior timestamp on file?arrow_forwardHow can methods for avoiding and preventing deadlock vary from one another?arrow_forward
- Transactions often take a long time when optimistic concurrency control is used. Explain.arrow_forwardWhat are the potential repercussions of having a low level of "isolation" in transactions?arrow_forwardHow do "isolation levels" affect the visibility of uncommitted changes in transactions?arrow_forward
- What role do "isolation levels" play in determining the visibility of uncommitted changes during transactions?arrow_forwardA deadlock is a possible side effect of employing locks to avoid race situations. Explain what a deadlock is in this situation.arrow_forwardA new timestamp is assigned to a transaction if it is rolled back in timestamp order. Why can't it simply use the same date and time as before?arrow_forward
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