1.查看所有數據庫各容量大小

select
table_schema as '數據庫',
sum(table_rows) as '記錄數',
sum(truncate(data_length/1024/1024, 2)) as '數據容量(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;

2.查看所有數據庫各表容量大小

select
table_schema as '數據庫',
table_name as '表名',
table_rows as '記錄數',
truncate(data_length/1024/1024, 2) as '數據容量(MB)',
truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
order by data_length desc, index_length desc;

3.查看指定數據庫容量大小
例：查看mysql庫容量大小

select
table_schema as '數據庫',
sum(table_rows) as '記錄數',
sum(truncate(data_length/1024/1024, 2)) as '數據容量(MB)',
sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
from information_schema.tables
where table_schema='mysql';　

4.查看指定數據庫各表容量大小
例：查看mysql庫各表容量大小

select
table_schema as '數據庫',
table_name as '表名',
table_rows as '記錄數',
truncate(data_length/1024/1024, 2) as '數據容量(MB)',
truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
where table_schema='mysql'
order by data_length desc, index_length desc;

5，查看所有庫的總大小
select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables;
6，查看指定庫的大小
比如查看數據庫dbname01的大小
select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables where table_schema='dbname01';
7、查看指定數據庫的某個表的大小
比如查看數據庫dbname01中 talbename01表的大小
select concat(round(sum(data_length/1024/1024),2),'MB') as data from tables where table_schema='dbname01' and table_name='talbename01';
轉載來自：https://www.cnblogs.com/--smile/p/11451238.html