Each heap relation has a Visibility Map (VM) to keep track of which pages contain only tuples that are known to be visible to all active transactions; it also keeps track of

Each index access method is described by a row in the pg_am

The amcostestimate function is given information describing a possible index scan, including lists of WHERE and ORDER BY clauses that have been

Traditionally, implementing a new index access method meant a lot of difficult work. It was necessary to understand the inner workings of the database, such as the lock manager

The BRIN interface has a high level of abstraction, requiring the access method implementer only to implement the semantics of the data type

The core PostgreSQL distribution includes the GiST operator classes shown in Table 61-1. (Some of the optional

The PostgreSQL source distribution includes several examples of index operator classes for SP-GiST, as described

This section describes the storage format at the level of files and directories. Traditionally, the configuration and data files used by a database

Each unlogged table, and each index on an unlogged table, has an initialization fork. The initialization fork is an empty table or index of the appropriate type. When an unlogged

This section provides an overview of the page format used within PostgreSQL tables and indexes.[1] Sequences