导出指定表
mysqldump --no-create-info -uroot -proot test book book_chapter book_chapter_item > book.sql

导出数据库，排除某几个表
/usr/local/mysql/bin/mysqldump -uroot -proot --ignore-table=shiji.log  shiji > /data/shiji/db/shiji.sql

统计所有库大小
SELECT 
    table_schema AS '数据库', 
    sum(table_rows) AS '记录数', 
    sum(truncate(data_length/1024/1024, 2) ) AS '数据容量(MB)', 
    sum(truncate(index_length/1024/1024, 2) ) AS '索引容量(MB)'
FROM information_schema.TABLES
GROUP BY  table_schema
ORDER BY  sum(data_length) desc, sum(index_length) desc; 

查看某个库的所有表大小
SELECT 
    table_schema AS '数据库', 
    table_name AS '表名', 
    table_rows AS '记录数', 
    truncate(data_length/1024/1024, 2) AS '数据容量(MB)', 
    truncate(index_length/1024/1024, 2) AS '索引容量(MB)'
FROM information_schema.TABLES
WHERE table_schema = 'test'
ORDER BY  data_length desc, index_length desc;

查看某个表大小
SELECT table_name,
         round(data_length/1024/1024, 2) AS '数据容量', 
         round(index_length/1024/1024, 2) AS '索引容量(MB)'
FROM information_schema.TABLES
WHERE table_schema = 'test' AND table_name = 'log'; 

授权多个IP
GRANT ALL PRIVILEGES ON *.* TO 'aishu'@'192.168.80.80,192.168.81.150' IDENTIFIED BY 'test';

创建账号

create user 'test2'@'%'  identified by 'dbname@tt';
grant all privileges on dbname.* to 'test2'@'%';
ALTER USER 'test2'@'%' IDENTIFIED WITH mysql_native_password BY ''dbname@tt';