October 2023
Intermediate to advanced
744 pages
15h 51m
English
Content preview from Learn PostgreSQL - Second Edition
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11
Transactions, MVCC, WALs, and Checkpoints
This chapter introduces you to transactions, a fundamental part of every enterprise-level database system. Transactions are a way for a database to manage multiple operations, making them as though they were a single atomic operation. PostgreSQL has very rich and standard-compliant transaction machinery that allows users to specifically define transaction properties, including nested transactions.
PostgreSQL relies heavily on transactions to keep data consistent across concurrent connections and parallel activities, and thanks to Write-Ahead Logs (WALs), PostgreSQL does its best to keep the data safe and reliable. Moreover, PostgreSQL implements Multi-Version Concurrency Control (MVCC), a way to maintain ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.