Concept explainers
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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Chapter 10 Solutions
Database Systems: Design, Implementation, & Management
- Determine the three problems that are most often encountered with concurrent transaction processing. Demonstrate how these problems may be avoided by using concurrency control in your explanation.arrow_forwardOptimistic concurrency management sometimes delays transactions. Explain?arrow_forwardDetermine 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_forward
- Transaction delays are commonplace when using an optimistic concurrency control approach. Explain.arrow_forwardWhen an optimistic approach to concurrency management is used, transactions typically take a lengthy time to complete. 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
- Discuss 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_forwardDescribe the methodology behind "time-stamp based concurrency control" in transaction processing.arrow_forward
- An 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_forwardExplain the concept of serializability and how it is related to concurrency control.arrow_forward
- Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781305627482Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781285196145Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos CoronelPublisher:Cengage Learning