MySQL查看数据库、表和索引的容量大小的方法

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)',
sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;

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)',
sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)'
from information_schema.tables
where table_schema='ry' -- 这里ry替换成你自己的数据库名
order by data_length desc, index_length desc;

SELECT
table_name as '表名',
(table_rows) as '记录数',
round(data_length/1024/1024, 2) as '数据容量(MB)',
round(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
where table_schema='ry'-- 你要查哪个数据库中的表
order by data_length desc, index_length desc;

SELECT
table_name as '表名',
engine as '存储引擎',
table_rows as '记录数',
*round*(data_length/1024/1024, 2) as '数据容量(MB)',
*round*(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
where table_schema='ry' -- 你要查哪个数据库
      and table_name = 'seat';-- 你要查哪个数据库中的哪个表