Database Systems: Design, Implementation, & Management
11th Edition
ISBN: 9781285196145
Author: Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher: Cengage Learning
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Chapter 10, Problem 2P
Explanation of Solution
Concurrency control:
The purpose of concurrency control is to ensure the serializability of transaction in a multiuser
Common problems with concurrent transaction execution:
Concurrency transaction is one or more transactions are processed on same time. During the concurrency transaction execution the following problems can occur in the transaction. They are:
- Lost updates
- Uncommitted data
- Inconsistent retrievals
Lost updates:
A data can be lost when the two different transactions want to update same field or row within the database at the same time.
- For example: if the transactions “T1” and “T2” want to update the same element and one of the updates is lost or overwritten by other transactions.
Uncommitted data:
The data of the transactions are not committed when the transactions are executed concurrently...
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Explain the three most prevalent problems with concurrent transaction execution. Explain how you can avoid these issues by using concurrency control.
Describe the three most common problems with concurrent transaction execution.Explain how concurrency control can be used to avoid those problems.
Optimistic concurrency management sometimes delays transactions. Explain?
Chapter 10 Solutions
Database Systems: Design, Implementation, & Management
Ch. 10 - Prob. 1RQCh. 10 - Prob. 2RQCh. 10 - Prob. 3RQCh. 10 - Prob. 4RQCh. 10 - Prob. 5RQCh. 10 - Prob. 6RQCh. 10 - Prob. 7RQCh. 10 - Prob. 8RQCh. 10 - Prob. 9RQCh. 10 - Prob. 10RQ
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- Determine the three most common problems that are associated with concurrent transaction processing. Demonstrate how these problems may be avoided by making use of concurrency control.arrow_forwardTransaction delays are commonplace when using an optimistic concurrency control approach. Explain.arrow_forwardDetermine the three most common challenges faced with concurrent transaction processing. In your explanation, show how concurrency management may be used to avoid these issues.arrow_forward
- When an optimistic approach to concurrency management is used, transactions typically take a lengthy time to complete. Explain?arrow_forwardDiscuss the concept of "isolation levels" in concurrency control. Provide examples of different isolation levels and their effects on concurrent transactions.arrow_forwardWhen an optimistic approach to concurrency management is used, transactions often take a very lengthy time to complete. Explain.arrow_forward
- Describe the methodology behind "time-stamp based concurrency control" in transaction processing.arrow_forwardAn optimistic concurrency control strategy often delays transactions. Explain.arrow_forwardDiscuss the role of transaction isolation levels (e.g., Read Uncommitted, Read Committed, Repeatable Read, Serializable) in managing concurrency. Provide examples of scenarios where each isolation level is appropriate.arrow_forward
- Explain the concept of deadlock in concurrent systems and provide examples of real-world situations where deadlock can occur.arrow_forwardExplain the concept of serializability and how it is related to concurrency control.arrow_forwardWhen an optimistic approach to concurrency management is employed, transactions frequently require a considerable amount of time to conclude. Explain?arrow_forward
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