The pg_buffercache module provides a means for examining what's happening in the shared buffer cache in real time. The

The pg_visibility module provides a means for examining the visibility map (VM) and page-level visibility information. It also provides functions

The tsm_system_rows module provides the table sampling method SYSTEM_ROWS, which can be used in the

This module implements a data type chkpass that is designed for storing encrypted passwords. Each password is automatically converted to encrypted

The intarray module provides a number of useful functions and operators for manipulating null-free arrays of integers. There is also support for

The earthdistance module provides two different approaches to calculating great circle distances on the surface of the Earth. The one described

The tsearch2 module provides backwards-compatible text search functionality for applications that used tsearch2

Table C-1 lists all tokens that are key words in the SQL standard and in PostgreSQL 9.6.0. Background information can be found in Section 4

bloom provides an index access method based on Bloom filters

The SQL standard states that "Within the definition of a 'datetime literal', the 'datetime values'