SHOW

Name

SHOW -- show the value of a run-time parameter

Synopsis

SHOW name SHOW ALL

Description

SHOW 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 . See Chapter 17 for details.

Parameters

name

The name of a run-time parameter. Available parameters are documented in Chapter 17 and on the SET reference page. In addition, there are a few parameters that can be shown but not set:

SERVER_VERSION

Shows the server's 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 database's locale setting for collation (text ordering). At present, this parameter can be shown but not set, because the setting is determined at initdb time.

LC_CTYPE

Shows the database's locale setting for character classification. At present, this parameter can be shown but not set, because the setting is determined at initdb time.

IS_SUPERUSER

True if the current role has superuser privileges.

ALL

Show the values of all configuration parameters, with descriptions.

Notes

The function current_setting produces equivalent output. See Section 9.20 .

Examples

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 --------------------------------+--------------------------------+---------------------------------------------------------------------------------------------- add_missing_from | off | Automatically adds missing table references to FROM clauses. archive_command | unset | WAL archiving command. . . . work_mem | 1024 | Sets the maximum memory to be used for query workspaces. zero_damaged_pages | off | Continues processing past damaged page headers. (146 rows)

Compatibility

The SHOW command is a PostgreSQL extension.

See Also

SET , RESET