May 2018
Intermediate to advanced
576 pages
30h 25m
English
PostgreSQL provides a dedicated function, pg_relation_size, to compute the actual disk space used by a specific table or index. We just need to provide the table name. In addition to the main data files, there are other files (called forks) that can be measured by specifying an optional second argument. These include the Visibility Map (VM), the Free Space Map (FSM), and the Initialization Fork for unlogged objects.