1.查看所有数据库各容量大小
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;
2.查看所有数据库各表容量大小
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
order by data_length desc, index_length desc;
3.查看指定数据库容量大小
例：查看mysql库容量大小
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
where table_schema='mysql';
4.查看指定数据库各表容量大小
例：查看mysql库各表容量大小
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='mysql'
order by data_length desc, index_length desc;
5，查看所有库的总大小
select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables;
6，查看指定库的大小
比如查看数据库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、查看指定数据库的某个表的大小
比如查看数据库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';
转载来自：https://www.cnblogs.com/--smile/p/11451238.html
