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

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

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

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

The passwordcheck module checks users' passwords whenever they are set with CREATE

The file_fdw module provides the foreign-data wrapper file_fdw, which can be used to access data files in the server's

The fuzzystrmatch module provides several functions to determine similarities and distance between strings.

The pg_trgm module provides functions and operators for determining the similarity of alphanumeric text based on trigram matching, as well as

dict_xsyn (Extended Synonym Dictionary) is an example of an add-on dictionary template for full-text search. This dictionary type replaces words

btree_gist provides GiST index operator classes that implement B-tree equivalent behavior for the data types int2,