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Chapter 24: Problem 7

What are the differences between valid time, transaction time, and bitemporal relations?

Short Answer

Expert verified
Valid Time is the time period when a fact is true in real world, Transaction Time represents the time period a fact is stored in the database, and Bitemporal Relations combine both, tracking when a fact was true in real world and when it was stored in the database.

Step by step solution

01

Explain Valid Time

Valid Time is the time period during which a fact is true in the real world. It's represented in the database by two data values, indicating the start and end duration when the data was applicable in the actual world scenario.
02

Explain Transaction Time

Transaction Time is the time period during which a fact is stored in the database. It’s also represented in the database by two data data values indicating when the data came into the database and when it was deleted or updated.
03

Explain Bitemporal Relations

Bitemporal Relations combine both Valid Time and Transaction Time. They track both when a fact was true in real world and when it was stored in the database. Bitemporal data is stored in a bitemporal table that includes both valid time and transaction time columns for keeping this dual period information.

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