Chapter 11: Problem 5

What is the lossless (or nonadditive) join property of a decomposition? Why is it important?

Short Answer

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The lossless join property of a decomposition refers to the ability to perfectly reconstruct the original database from its decomposed parts without any loss or creation of information. This property is important as it ensures the accuracy and integrity of data in a database, preventing loss or creation of additional, incorrect information during the process of decomposition.

Step by step solution

Define Lossless Join Property

The lossless join property refers to a desirable characteristic of the decomposition process in databases. When a database is decomposed, it is broken into two or more smaller databases. If the original database can be perfectly reconstructed by joining these decomposed parts without adding or losing any information, the decomposition is said to have the lossless (or nonadditive) join property.

Explain Importance of Lossless Join Property

The lossless join property is important to ensure the accuracy and integrity of data in a database. When we decompose a database into smaller parts, we don't want to lose any information or create additional, incorrect information. Lossless join ensures that the original information can be perfectly reconstructed from the decomposed databases. It guarantees that the decomposition does not result in the loss of information or the introduction of spurious information, hence preserving database consistency and integrity.

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What is the lossless (or nonadditive) join property of a decomposition? Why is it important?

Short Answer

Step by step solution

Define Lossless Join Property

Explain Importance of Lossless Join Property

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