查询库占用的空间和索引占用的空间

查整个库的状态：

select concat(truncate(sum(data_length)/1024/1024,2),'MB') as data_size,

concat(truncate(sum(max_data_length)/1024/1024,2),'MB') as max_data_size,

concat(truncate(sum(data_free)/1024/1024,2),'MB') as data_free,

concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size

from information_schema.tables where TABLE_SCHEMA = 'databasename';

 

查单表：

select concat(truncate(sum(data_length)/1024/1024,2),'MB') as data_size,

concat(truncate(sum(max_data_length)/1024/1024,2),'MB') as max_data_size,

concat(truncate(sum(data_free)/1024/1024,2),'MB') as data_free,

concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size

from information_schema.tables where TABLE_NAME = 'tablename';

 

查看数据库使用大小：

select concat(round(sum(data_length/1024/1024),2),’MB’) as data from information_schema.tables where table_schema=’DB_Name’ ;

 

查看表使用大小：

select concat(round(sum(data_length/1024/1024),2),’MB’) as data from information_schema.tables where table_schema=’DB_Name’ and table_name=’Table_Name’;

 

或者直接用： 

SHOW TABLE STATUS;