May 2018
Intermediate to advanced
576 pages
30h 25m
English
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition
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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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