SHOW - show the value of a run-time parameter
SHOW name
SHOW ALLSHOW will display the current setting of run-time parameters. These variables can be set using the SET statement, by editing the postgresql.conf configuration file, through the PGOPTIONS environmental variable (when using libpq or a libpq-based application), or through command-line flags when starting the postgres server. See Chapter 20 for details.
name
The name of a run-time parameter. Available parameters are documented in Chapter 20 and on the SET(7) reference page. In addition, there are a few parameters that can be shown but not set:
SERVER_VERSION
Shows the servers version number.
SERVER_ENCODING
Shows the server-side character set encoding. At present, this parameter can be shown but not set, because the encoding is determined at database creation time.
LC_COLLATE
Shows the databases locale setting for collation (text ordering). At present, this parameter can be shown but not set, because the setting is determined at database creation time.
LC_CTYPE
Shows the databases locale setting for character classification. At present, this parameter can be shown but not set, because the setting is determined at database creation time.
IS_SUPERUSER
True if the current role has superuser privileges.
ALL
Show the values of all configuration parameters, with descriptions.
The function current_setting produces equivalent output; see Section 9.27.1. Also, the pg_settings system view produces the same information.
Show the current setting of the parameter DateStyle:
SHOW DateStyle; DateStyle ----------- ISO, MDY (1 row)
Show the current setting of the parameter geqo:
SHOW geqo; geqo ------ on (1 row)
Show all settings:
SHOW ALL; name | setting | description -------------------------+---------+------------------------------------------------- allow_system_table_mods | off | Allows modifications of the structure of ... . . . xmloption | content | Sets whether XML data in implicit parsing ... zero_damaged_pages | off | Continues processing past damaged page headers. (196 rows)
The SHOW command is a PostgreSQL extension.