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

Explanation of Solution

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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