show(7) - phpMan

SHOW() SQL Commands 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 server. See in the documentation for
details.

PARAMETERS
name The name of a run-time parameter. Available parameters are documented in in the
documentation and on the SET [set(7)] 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 cre-
ation 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 in the documentation. 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
--------------------------------+--------------------------------+----------------------------------------------------------------------------------------------
add_missing_from | off | Automatically adds missing table references to FROM clauses.
allow_system_table_mods | off | Allows modifications of the structure of system tables.
.
.
.
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.