如何查看mysql内存溢出 mysql查看剩余空间大小

-- 1. 进入information_schema 数据库（存放了其他的数据库的信息）

use information_schema;

-- 2. 查询所有数据的大小：

select concat(round(sum(data_length/1024/1024),2),'MB') as data 
from information_schema.tables
;

-- 3. 查看实例下所有数据库的空间占用情况

select 
     table_schema
    ,concat(round(sum(data_length/1024/1024),2),'MB') as data 
from information_schema.tables 
where table_schema like 'db_name_%' 
group by table_schema
;

-- 4.查看指定数据库的大小：

select concat(round(sum(data_length/1024/1024),2),'MB') as data 
from information_schema.tables 
where table_schema='home'
;

-- 5. 查看指定数据库下的所有表的空间占用情况

select table_name,round(sum(data_length/1024/1024),2) as size 
from information_schema.tables 
where table_schema='DB_NAME'
group by table_name
order by size
;

-- 6. 查看指定数据库的某个表的大小

select concat(round(sum(data_length/1024/1024),2),'MB') as data 
from information_schema.tables 
where table_schema='home' and table_name='members'
;select     table_schema    ,round(sum(data_length/1024/1024),2) as data_length     ,round(sum(DATA_FREE/1024/1024),2) as data_free    ,round(sum(INDEX_LENGTH/1024/1024),2) as INDEX_LENGTHfrom information_schema.tables where table_schema='DB_NAME'group by table_schemaorder by data_length;