NAME

SHOW - 顯示運(yùn)行時(shí)參數(shù)的數(shù)值

SYNOPSIS

SHOW name
SHOW ALL

DESCRIPTION 描述

SHOW 將顯示當(dāng)前運(yùn)行時(shí)參數(shù)的數(shù)值。 這些變量可以通過 SET 語句來設(shè)置，或者通過編輯 postgresql.conf， 或者通過 PGOPTIONS 環(huán)境變量，（在使用libpq或者以 libpq 為基礎(chǔ)的應(yīng)用的時(shí)候。） 或者在postmaster啟動(dòng)時(shí)用命令行參數(shù)來設(shè)置。 參閱 Section 16.4 ``Run-time Configuration'' 獲取細(xì)節(jié)。  

PARAMETERS 參數(shù)

name

 運(yùn)行時(shí)參數(shù)的名稱?？捎玫膮?shù)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(gè)參數(shù)可以顯示，但是不能設(shè)置：

SERVER_VERSION

 顯示服務(wù)器的版本號(hào)。

SERVER_ENCODING

 顯示服務(wù)器斷的字符集編碼。目前，這個(gè)參數(shù)只能顯示但不能設(shè)置， 因?yàn)榫幋a是在創(chuàng)建數(shù)據(jù)庫的時(shí)候決定的。

LC_COLLATE

 顯示數(shù)據(jù)庫的字符集區(qū)域設(shè)置（字符順序）。目前，這個(gè)參數(shù)只能顯示 但不能設(shè)置，因?yàn)樵O(shè)置是在 initdb 的時(shí)候設(shè)置的。

LC_CTYPE

 為字符集分類顯示數(shù)據(jù)庫的區(qū)域設(shè)置。目前，這個(gè)參數(shù)只能顯示，不能設(shè)置， 因?yàn)樗脑O(shè)置是在 initdb 的時(shí)候決定的。

IS_SUPERUSER

 如果當(dāng)前事務(wù)認(rèn)證標(biāo)識(shí)符有超級(jí)用戶權(quán)限，則為真。

ALL

 顯示所有當(dāng)前會(huì)話參數(shù)。

NOTES

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

EXAMPLES 例子

 顯示當(dāng)前 DateStyle 的設(shè)置：

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

 顯示參數(shù)geqo的當(dāng)前設(shè)置：

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

 顯示所有設(shè)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(kuò)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)]