NAME

SHOW - 顯示運行時參數的數值

SYNOPSIS

SHOW name
SHOW ALL

DESCRIPTION 描述

SHOW 將顯示當前運行時參數的數值。 這些變量可以通過 SET 語句來設置，或者通過編輯 postgresql.conf， 或者通過 PGOPTIONS 環境變量，（在使用libpq或者以 libpq 為基礎的應用的時候。） 或者在postmaster啟動時用命令行參數來設置。 參閱 Section 16.4 ``Run-time Configuration'' 獲取細節。  

PARAMETERS 參數

name

 運行時參數的名稱。可用的參數在 Section 16.4 ``Run-time Configuration'' 里面有文檔，以及 SET [set(7)] 手冊頁。 另外，還有幾個參數可以顯示，但是不能設置：

SERVER_VERSION

 顯示服務器的版本號。

SERVER_ENCODING

 顯示服務器斷的字符集編碼。目前，這個參數只能顯示但不能設置， 因為編碼是在創建數據庫的時候決定的。

LC_COLLATE

 顯示數據庫的字符集區域設置（字符順序）。目前，這個參數只能顯示 但不能設置，因為設置是在 initdb 的時候設置的。

LC_CTYPE

 為字符集分類顯示數據庫的區域設置。目前，這個參數只能顯示，不能設置， 因為它的設置是在 initdb 的時候決定的。

IS_SUPERUSER

 如果當前事務認證標識符有超級用戶權限，則為真。

ALL

 顯示所有當前會話參數。

NOTES

 函數 current_setting 生成相同輸出。 參閱 Section 9.13 ``Miscellaneous Functions'' 。  

EXAMPLES 例子

 顯示當前 DateStyle 的設置：

SHOW DateStyle;
 DateStyle
-----------
 ISO, MDY
(1 row)

 顯示參數geqo的當前設置：

SHOW geqo;
 geqo
------
 on
(1 row)

 顯示所有設置：

SHOW ALL;
             name              |                setting
-------------------------------+---------------------------------------
 australian_timezones          | off
 authentication_timeout        | 60
 checkpoint_segments           | 3
    .
    .
    .
 wal_debug                     | 0
 wal_sync_method               | fdatasync
(94 rows)

COMPATIBILITY 兼容性

SHOW 命令是 PostgreSQL 擴展。  

SEE ALSO

SET [set(7)]

#p#

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 postmaster. See the section called ``Run-time Configuration'' in the documentation for details.  

PARAMETERS

name

The name of a run-time parameter. Available parameters are documented in the section called ``Run-time Configuration'' 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 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 session authorization identifier has superuser privileges.

ALL

Show the values of all configurations parameters.

NOTES

The function current_setting produces equivalent output. See the section called ``Miscellaneous Functions'' in the documentation.  

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
-------------------------------+---------------------------------------
 australian_timezones          | off
 authentication_timeout        | 60
 checkpoint_segments           | 3
    .
    .
    .
 wal_debug                     | 0
 wal_sync_method               | fdatasync
(94 rows)

COMPATIBILITY

The SHOW command is a PostgreSQL extension.  

SEE ALSO

SET [set(7)]