SHOW

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 server. See Chapter 19 for details.

Parameters

  • name

    • The name of a run-time parameter. Available parameters are documented in Chapter 19 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 database creation 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 database creation 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 9.26. Also, the pg_settings system view produces the same information.

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                                                          
-------------------------+---------+-------------------------------------------------
 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)

Compatibility

The SHOW command is a PostgreSQL extension.

See Also

SET, RESET