关于 mysqladmin

>mysqladmin 工具的使用格式：

mysqladmin [option] command [command option] command ......

option 选项：

-c number 自动运行次数统计，必须和 -i 一起使用

-i number 间隔多长时间重复执行

每个两秒查看一次服务器的状态，总共重复5次。

./mysqladmin -uroot -p -i 2 -c 5 status

-#, --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. 禁用错误，drop 数据库时不提示，执行多条命令时出错继续执行
-C, --compress Use compression in server/client protocol.
--character-sets-dir=name 字符集所在目录
Directory where character sets are.
--default-character-set=name 设置默认字符集
Set the default character set.
-?, --help Display this help and exit. 显示帮助

-h, --host=name Connect to host. 连接的主机名或iP
-p, --password[=name] 登录密码，如果不写于参数后，则会提示输入
Password to use when connecting to server. If password is
not given it's asked from the tty.
-P, --port=# Port number to use for connection. 指定数据库端口
--protocol=name The protocol of connection (tcp,socket,pipe,memory). 指定连接协议
-r, --relative Show difference between current and previous values when
used with -i. Currently works only with extended-status. 显示前后变化的值，必须结合- i

./mysqladmin -uroot -p -i 2 -r extended-status

假如此处显示的uptime 将永远是2，因为与之前取的结果比只相差2.

-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.修改变量的值，该选项已经不再使用，请使用--variable-name=value 的方式修改变量值
-s, --silent Silently exit if one can't connect to server.
-S, --socket=name Socket file to use for connection. 指定socket file
-i, --sleep=# Execute commands again and again with a sleep between. 间隔一段时间执行一次
-u, --user=name User for login if not current user.登录数据库用户名
-v, --verbose Write more information. 写更多的信息
-V, --version Output version information and exit. 显示版本

./mysql -uroot -p -V

-E, --vertical Print output vertically. Is similar to --relative, but
prints output vertically.
-w, --wait[=#] Wait and retry if connection is down. 如果连接断开，等待w 指定的时间后重试
--connect_timeout=#
--shutdown_timeout=#

1、查看服务器的状况：status

./mysql -uroot -p status

显示结果：

Uptime: 4883162 Threads: 1 Questions: 86 Slow queries: 0 Opens: 0 Flush tables: 1 Open tables: 18 Queries per second avg: 0.000

2.修改root 密码：

mysqladmin -u root -poldpassword password 'newpassword'

3.检查mysqlserver是否可用：

mysqladmin -uroot -p ping

显示结果：

mysqld is alive

4.查询服务器的版本

mysqladmin -uroot -p version

5.查看服务器状态的当前值：

mysqladmin -uroot -p extended-status

显示结果：

+-----------------------------------+----------+
| Variable_name | Value |
+-----------------------------------+----------+
| Aborted_clients | 12 |
| Aborted_connects | 300 |
| Binlog_cache_disk_use | 0 |
| Binlog_cache_use | 0 |
| Bytes_received | 23608 |
| .......

|Threads_created | 3 |
| Threads_running | 1 |
| Uptime | 4884294 |
+-----------------------------------+----------+

6.查询服务器系统变量值：

mysqladmin -uroot -p variables

显示结果：

+---------------------------------+----------------------------------------+
| Variable_name | Value |
+---------------------------------+----------------------------------------+
| auto_increment_increment | 1 |
| auto_increment_offset | 1 |
| automatic_sp_privileges | ON |
| back_log | 50 |
| basedir | /usr/local/mysql/ |

..

7.显示服务器所有运行的进程：

mysqladmin -uroot -p processlist

mysqladmin -uroot -p-i 1 processlist 每秒刷新一次

显示结果：

+-----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+------+-----------+----+---------+------+-------+------------------+
| 331 | root | localhost | | Query | 0 | | show processlist |
+-----+------+-----------+----+---------+------+-------+------------------+

8.创建数据库

./mysqladmin -uroot -p create daba-test

验证：

./mysql -uroot -p 登录后：show databases;

9.显示服务器上的所有数据库

./mysqlshow -uroot -p

10.显示数据库daba-test下有些什么表：

./mysqlshow -uroot -p daba-test

11.统计daba-test 下数据库表列的汇总

./mysqlshow -uroot -p daba-test -v

12.统计daba-test 下数据库表的列数和行数

./mysqlshow -uroot -p daba-test -v -v

13. 删除数据库 daba-test

./mysqladmin -uroot -p drop daba-test

14. 重载权限信息

./mysqladmin -uroot -p reload

15.刷新所有表缓存，并关闭和打开log

./mysqladmin -uroot -p refresh

16.使用安全模式关闭数据库

./mysqladmin -uroot -p shutdown

You can also use “/etc/rc.d/init.d/mysqld stop” to shutdown the server. To start the server, execute “/etc/rc.d/init.d/mysql start”--如果不是以服务来运行则这两条命令无效

17.mysqladmin flush commands

# mysqladmin -u root -ptmppassword flush-hosts
# mysqladmin -u root -ptmppassword flush-logs
# mysqladmin -u root -ptmppassword flush-privileges
# mysqladmin -u root -ptmppassword flush-status
# mysqladmin -u root -ptmppassword flush-tables
# mysqladmin -u root -ptmppassword flush-threads

•flush-hosts: Flush all information in the host cache.
•flush-privileges: Reload the grant tables (same as reload).
•flush-status: Clear status variables.
•flush-threads: Flush the thread cache.
18 .mysqladmin 执行kill 进程：

./mysqladmin -uroot -p processlist

./mysqladmin -uroot -p kill idnum

19.停止和启动MySQL replication on a slave server

mysqladmin -u root -p stop-slave

mysqladmin -u root -p start-slave

20 .同时执行多个命令

mysqladmin -u root -p process status version