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Transaction Management Ch 10

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Chapter 10

Transaction Management and Concurrency Control

Discussion Focus

Why does a multi-user database environment give us a special interest in transaction management and concurrency control?

Begin by exploring what a transaction is, what its components are, and why it must be managed carefully even in a single-user database environment. Then explain why a multi-user database environment makes transaction management even more critical.

Emphasize the following points: • A transaction represents a real-world event such as the sale of a product. • A transaction must be a logical unit of work. That is, no portion of a transaction stands by itself. For example, the product sale has an effect on inventory and, if it is a credit sale, it has an effect on customer balances. • A transaction must take a database from one consistent state to another. Therefore, all parts of a transaction must be executed or the transaction must be aborted. (A consistent state of the database is one in which all data integrity constraints are satisfied.)

All transactions have four properties: Atomicity, Consistency, Isolation, and Durability. (These four properties are also known as the ACID test of transactions.) In addition, multiple transactions must conform to the property of serializability. Table IM10.1 provides a good summary of transaction properties.

Table IM10.1 Transaction Properties.
|Multi-user | |Single-user | |atomicity: Unless all parts of the executed, the transaction is aborted |
|Databases | |Databases | | |
| | | | |consistency. Indicates the permanence of the database’s consistent state. |
| | | | |durability:

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