November 2015
Beginner
464 pages
9h 46m
English
Content preview from Learning PostgreSQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Transaction isolation and multiversion concurrency control
There is a fundamental concept is called transaction in relational databases. Transaction is a unit of data change. PostgreSQL implements a set of principles related to transaction processing, which is called ACID:
- Atomicity: Every transaction can be fixed (saved or committed) only as a whole. If one part of a transaction fails, the whole transaction is aborted and no changes are saved at all.
- Consistency: All data integrity constraints are checked and all triggers are processed before a transaction is fixed. If any constraint is violated, then the transaction cannot be fixed.
- Isolation: A database system manages concurrent access to the data objects by parallel transactions in a way that ...
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