# 进入 存储数据库信息库
use information_schema;

# 查看所有数据库容量大小
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
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;

# 查看指定数据库使用大小, 以demo 为库名 为例子
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='demo';

# 查看指定表使用大小
# demo为库名 demo_key为表名 
select table_name as '表名',
table_rows as '记录数',
concat(round(sum(data_length/1024/1024),2),'MB') as '数据容量(MB)', 
truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from tables 
where table_schema='demo' and table_name='demo_key';

# 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;

# 查看指定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
where table_schema='short_video'
order by data_length desc, index_length desc;