mysqladmin帮助分析

1. 使用mysqladmin客户端管理程序管理MySQL

2. 获取帮助信息
shell>mysqladmin --help

3.
解析帮助信息
------------------------------

<wbr></wbr>------------------------------<wbr></wbr>-------------------
mysqladmin Ver 8.41 Distrib 5.0.45, for Win32 on ia32
Copyright (C) 2000-2006 MySQL AB
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license

Administration program for the mysqld daemon.
//MySQL客户端管理应用程序mysqladmin

Usage:
mysqladmin [OPTIONS] command command....

OPTIONS

-c, --count=# Number of iterations to make. This works with -i (--sleep) only.

-#, --debug[=name] Output debug log. Often this is 'd:t:o,filename'.
-f, --force Don't ask for confirmation on drop database; with
multiple commands, continue even if an error occurs.
-C, --compress Use compression in server/client protocol.
--character-sets-dir=name
Directory where character sets are.
--default-character-set=name
Set the default character set.
-?, --help Display this help and exit.

-h, --host=name Connect to host.
-p, --password[=name]
Password to use when connecting to server. If password is
not given it's asked from the tty.
-W, --pipe Use named pipes to connect to server.
-P, --port=# Port number to use for connection.
--protocol=name The protocol of connection (tcp,socket,pipe,memory).
-r, --relative Show difference between current and previous values when
used with -i. Currently works only with extended-status.
-O, --set-variable=name
Change the value of a variable. Please note that this
option is deprecated; you can set variables directly with
--variable-name=value.
--shared-memory-base-name=name
Base name of shared memory.
-s, --silent Silently exit if one can't connect to server.
-S, --socket=name Socket file to use for connection.
-i, --sleep=# Execute commands again and again with a sleep between.
--ssl Enable SSL for connection (automatically enabled with
other flags). Disable with --skip-ssl.
--ssl-ca=name CA file in PEM format (check OpenSSL docs, implies
--ssl).
--ssl-capath=name CA directory (check OpenSSL docs, implies --ssl).
--ssl-cert=name X509 cert in PEM format (implies --ssl).
--ssl-cipher=name SSL cipher to use (implies --ssl).
--ssl-key=name X509 key in PEM format (implies --ssl).
--ssl-verify-server-cert
Verify server's "Common Name" in its cert against
hostname used when connecting. This option is disabled by
default.
-u, --user=name User for login if not current user.
-v, --verbose Write more information.
-V, --version Output version information and exit.
-E, --vertical Print output vertically. Is similar to --relative, but
prints output vertically.
-w, --wait[=#] Wait and retry if connection is down.
--connect_timeout=#
--shutdown_timeout=#

OPTIONS变量的值
Variables (--variable-name=value)
and boolean options {FALSE|TRUE} Value (after reading options)
------------------------------<wbr></wbr>--- -----------------------------
count<wbr></wbr> 0
force<wbr></wbr> FALSE
compress<wbr></wbr> FALSE
character-sets-dir<wbr></wbr> (No default value)
default-character-set<wbr></wbr> (No default value)
host<wbr></wbr> (No default value)
port<wbr></wbr> 3306
relative<wbr></wbr> FALSE
shared-memory-base-name<wbr></wbr> (No default value)
socket<wbr></wbr> (No default value)
sleep<wbr></wbr> 0
ssl<wbr></wbr> FALSE
ssl-ca<wbr></wbr> (No default value)
ssl-capath<wbr></wbr> (No default value)
ssl-cert<wbr></wbr> (No default value)
ssl-cipher<wbr></wbr> (No default value)
ssl-key<wbr></wbr> (No default value)
ssl-verify-server-cert<wbr></wbr> FALSE
user<wbr></wbr> (No default value)
verbose<wbr></wbr> FALSE
vertical<wbr></wbr> FALSE
connect_timeout<wbr></wbr> 43200
shutdown_timeout<wbr></wbr> 3600

//默认配置文件保存在my.ini文件里
Default options are read from the following files in the given order:
C:\my.ini C:\my.cnf C:\WINDOWS\my.ini C:\WINDOWS\my.cnf C:\Program Files\MySQL\MySQL Server 5.0\my.ini C:\Program Files\MySQL\MySQL Server 5.0\my.cnf
The following groups are read: mysqladmin client
The following options may be given as the first argument:
--print-defaults Print the program argument list and exit
--no-defaults Don't read default options from any options file
--defaults-file=# Only read default options from the given file #
--defaults-extra-file=# Read this file after the global files are read

command
Where command is a one or more of: (Commands may be shortened)
create databasename Create a new database
debug Instruct server to write debug information to log
drop databasename Delete a database and all its tables
extended-status Gives an extended status message from the server
flush-hosts Flush all cached hosts
flush-logs Flush all logs
flush-status Clear status variables
flush-tables Flush all tables
flush-threads Flush the thread cache
flush-privileges Reload grant tables (same as reload)

processlist Show list of active threads in server

kill id,id,... Kill mysql threads
//杀掉正在执行的mysql访问线程

password new-password Change old password to new-password, MySQL 4.1 hashing.

old-password new-password Change old password to new-password in old format.

ping Check if mysqld is alive

reload Reload grant tables
refresh Flush all tables and close and open logfiles
shutdown Take server down
status Gives a short status message from the server
start-slave Start slave
stop-slave Stop slave
variables Prints variables available
version Get version info from server


4. mysqladmin中常用的命令

mysqladmin [OPTIONS] command command...

mysqladmin -u root -p command...
//登录

mysqladmin -V
//查看版本信息

mysqladmin -u root -p create new_database
mysqladmin -u root -p drop database_name

//查看mysql线程
mysqladmin -u root -p processlist
mysqladmin -u root -p kiss thread_id

还可以在mysql>下使用
show processlist
kill thread_id

修改用户密码
mysqladmin -u root -p password new_password

mysqladmin -u root -p ping
//check if mysqld is alive

mysqladmin -u root -p variables
//prints variables available

mysqladmin -u root -p status
mysqladmin -u root -p shutdown