查看mysql 数据库的大小

SELECT table_schema AS '数据库名称',
ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS '数据库大小(MB)'
FROM information_schema.tables
GROUP BY table_schema;

查询数据库中表的 数据量（这个方法 有缓存延迟，只能用于参照）

SELECT TABLE_NAME, TABLE_ROWS 
FROM information_schema.tables 
WHERE TABLE_SCHEMA = '数据库名称' 
order by TABLE_ROWS desc

查询数据库中 表 占用的空间

SELECT * FROM (SELECT table_schema,table_name,ROUND(SUM(data_length + index_length) / 1024 / 1024 / 1024, 2) AS TableGBFROM information_schema.tables WHERE 0=0and table_schema ='数据库名称' group by table_schema,table_name) T1 ORDER BY T1.TableGB desc

;