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D:seegotmysql5.5.36in> mysql -uroot -proot Welcome to the MySQL monitor. Commands end with ; or g. Your MySQL connection id is 309 Server version: 5.5.36 MySQL Community Server (GPL) Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
查看数据库版本:
mysql> select version(); +-----------------------+ | version() | +-----------------------+ | 6.0.4-alpha-community | +-----------------------+ 1 row in set (0.02 sec)
查看当前时间:
mysql> select now(); +---------------------+ | now() | +---------------------+ | 2009-09-15 22:35:32 | +---------------------+ 1 row in set (0.04 sec)
查看连接数:
mysql> show status like 'Threads%'; +-------------------+-------+ | Variable_name | Value | +-------------------+-------+ | Threads_cached | 1 | | Threads_connected | 1 | | Threads_created | 2 | | Threads_running | 1 | ###当前连接数 +-------------------+-------+ rows in set (0.00 sec)
查看最大连接数:
mysql> show global variables like 'max_conn%'; +--------------------+-------+ | Variable_name | Value | +--------------------+-------+ | max_connect_errors | 10 | | max_connections | 500 |## 最大连接数 +--------------------+-------+ rows in set (0.00 sec)
1.导出整个数据库
导出文件默认是存在mysqlin目录下
mysqldump -u 用户名 -p 数据库名 > 导出的文件名
mysqldump -u user_name -p123456 database_name > outfile_name.sql
2.导出一个表
mysqldump -u 用户名 -p 数据库名 表名> 导出的文件名
mysqldump -u user_name -p database_name table_name > outfile_name.sql
3.导出一个数据库结构
mysqldump -u user_name -p -d –add-drop-table database_name > outfile_name.sql
-d 没有数据 –add-drop-table 在每个create语句之前增加一个drop table
4.带语言参数导出
mysqldump -uroot -p –default-character-set=latin1 –set-charset=gbk –skip-opt database_name > outfile_name.sql
例如,将aaa库备份到文件back_aaa中:
[root@test1 root]# cd /home/data/mysql
[root@test1 mysql]# mysqldump -u root -p --opt aaa > back_aaa