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Chapter 17: Problem 6

Discuss the atomicity, durability, isolation, and consistency preservation properties of a database transaction.

Short Answer

Expert verified
In a database transaction, atomicity is the all-or-nothing property which ensures that all changes in a transaction apply successfully or not at all. Durability guarantees that a committed transaction remains permanent even in the event of a system failure. Isolation makes sure that the execution of transactions doesn't interfere with each other, resulting in a system state as if the transactions were executed one after the other. Consistency ensures that a transaction moves the database from one valid state to another, complying with all constraints and rules.

Step by step solution

01

Atomicity

Atomicity refers to the all-or-nothing nature of database transactions. This means that a transaction is considered atomic if it is treated as a single unit that either results in all changes in a single transaction being applied successfully, or if any part of the transaction fails, the entire transaction fails and the database is left unchanged.
02

Durability

The durability property guarantees that once a transaction has been committed, it will remain committed even in the event of system failure. This is accomplished by storing a log or binary file of each transaction that modifies data.
03

Isolation

Isolation ensures that concurrent execution of transactions results in a system state that would be obtained if transactions were executed sequentially, i.e., one after the other. This means that the execution of one transaction doesn't interfere with the execution of another.
04

Consistency

The consistency property ensures that a transaction brings the database from one valid state to another. It adds a level of protection by guaranteeing that any transaction will bring the database from one state that complies with all rules and constraints to another state that also complies with all rules and constraints.

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Most popular questions from this chapter

What is a schedule (history)? Define the concepts of recoverable, cascadeless, and strict schedules, and compare them in terms of their recoverability.

What is the difference between the constrained write and the unconstrained write assumptions? Which is more realistic?

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What is meant by the concurrent execution of database transactions in a multiuser system? Discuss why concurrency control is needed, and give informal examples.

What is the system log used for? What are the typical kinds of records in a system log? What are transaction commit points, and why are they important?
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