Database Systems: Design, Implementation, & Management
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

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Concurrency control:

The purpose of concurrency control is to ensure the serializability of transaction in a multiuser database environment and it is the process of coordinating the simultaneous execution.

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.
List the top three issues with concurrent transaction processing. Demonstrate how concurrency control can solve these issues.
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