January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Transaction and ACID properties
A fundamental precept of relational databases is the concept of guaranteeing the Atomicity, Consistency, Isolation, and Durability (ACID) of its operations. This is referred to as ACID compliance.
A transaction is a logical execution unit and is indivisible, which means all-or-none, also known as atomicity; this statement holds true regardless of the reason for the failure. For example, a transaction might fail due to an error such as a mathematical error, the misspelling of a relation name, or even an operating system crash.
After the transaction is successfully committed, the transaction effect must persist even against hardware crashes; this property is referred to as durability. Furthermore, in a multi-user ...
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