1.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;

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;