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

dict_int is an example of an add-on dictionary template for full-text search. The motivation for this example dictionary is to control the indexing

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

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

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

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

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

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

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

The pg_freespacemap module provides a means for examining the free space map (FSM). It provides a function called pg_freespace