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PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

How it works…

In PostgreSQL, a table is made up of many relations. The main relation is the data table. In addition, there are a variety of additional data files. Each index created on a table is also a relation. Long data values are placed in a secondary table named TOAST, so in most cases, each table also has a TOAST table and a TOAST index.

Each relation consists of multiple data files. The main data files are broken into 1 GB pieces. The first file has no suffix; others have a numbered suffix (such as .2). There are also files marked _vm and _fsm, which represent the visibility map and free space map, respectively. They are used as part of maintenance operations. They stay fairly small, even for very large tables.

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Publisher Resources

ISBN: 9781788474924Supplemental Content