SHOW
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## 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 20 for details.

## Parameters

`name`

  The name of a run-time parameter. Available parameters are documented in Chapter 20 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 9.27.1. 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

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