Mysql基操-数据库存储空间查看

用Mysql许久，之前没什么需求去查看一个表占用硬盘空间多少，最近正好有需求，特此整理，以便自己日后方便

本文参考链接
百度经验文章
csdn文章

注：TABLE_SCHEMA值为数据库名，TABLE_NAME值为数据表名

一. 查询所有数据库的总大小
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from information_schema.TABLES;

二. 统计一下所有库数据量
SELECT
SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb
FROM information_schema.TABLES

三. 统计每个库大小(统计结果为数据+索引)
SELECT
table_schema,SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb
FROM information_schema.TABLES group by table_schema;

四. 查看指定数据库的大小(只统计了数据)
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from information_schema.TABLES where TABLE_SCHEMA='test' and TABLE_NAME='';

五. 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;

六. 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;

七. 查看指定数据库容量大小(两字段相加与三中结果相同)
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='';

八. 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=''
order by data_length desc, index_length desc;