NAME
SHOW - 显示运行时参数的数值
SYNOPSIS
SHOW name SHOW ALL
DESCRIPTION 描述
SHOW 将显示当前运行时参数的数值。 这些变量可以通过 SET 语句来设置，或者通过编辑 postgresql.conf， 或者通过 PGOPTIONS 环境变量，（在使用libpq或者以 libpq 为基础的应用的时候。） 或者在postmaster启动时用命令行参数来设置。 参阅 Section 16.4 ``Run-time Configuration'' 获取细节。
PARAMETERS 参数
- name
运行时参数的名称。可用的参数在 Section 16.4 ``Run-time Configuration'' 里面有文档，以及 SET [set(7)] 手册页。 另外，还有几个参数可以显示，但是不能设置：- SERVER_VERSION
显示服务器的版本号。- SERVER_ENCODING
显示服务器断的字符集编码。目前，这个参数只能显示但不能设置， 因为编码是在创建数据库的时候决定的。- LC_COLLATE
显示数据库的字符集区域设置（字符顺序）。目前，这个参数只能显示 但不能设置，因为设置是在 initdb 的时候设置的。- LC_CTYPE
为字符集分类显示数据库的区域设置。目前，这个参数只能显示，不能设置， 因为它的设置是在 initdb 的时候决定的。- IS_SUPERUSER
如果当前事务认证标识符有超级用户权限，则为真。
- ALL
显示所有当前会话参数。
NOTES
函数 current_setting 生成相同输出。 参阅 Section 9.13 ``Miscellaneous Functions'' 。
EXAMPLES 例子
显示当前 DateStyle 的设置：
SHOW DateStyle; DateStyle ----------- ISO, MDY (1 row)
显示参数geqo的当前设置：
SHOW geqo; geqo ------ on (1 row)
显示所有设置：
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 扩展。
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)]
