mysql查询存储量

   1.数据库占用大小:

          查询整个数据库已经存储占用的空间大小:

select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,concat(round(sum(index_length/1024/1024),2),'MB') 
as index_length_MB  
from information_schema.tables    
where table_schema='sj'; 

         thinkphp框架查询:

var_dump(M()->query("select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,concat(round(sum(index_length/1024/1024),2),'MB') as index_length_MB  
from information_schema.tables    
where table_schema='sj';  
"));

       打印结果:

array(1) { 
    [0]=> array(2) { 
        ["data_length_mb"]=> string(6) "0.16MB" 
        ["index_length_mb"]=> string(6) "0.13MB" 
    } 
}

  2.数据表占用大小: 

      查询整个数据表已经存储占用的空间大小:

select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,concat(round(sum(index_length/1024/1024),2),'MB') as index_length_MB  
from information_schema.tables    
where table_schema='sj' AND table_name='ds_user';

      thinkphp框架查询: 

var_dump(M()->query("select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,concat(round(sum(index_length/1024/1024),2),'MB') as index_length_MB  
from information_schema.tables    
where table_schema='sj' AND table_name='ds_user';  
"));

     打印结果:

array(1) { 
    [0]=> array(2) { 
        ["data_length_mb"]=> string(6) "0.02MB" 
        ["index_length_mb"]=> string(6) "0.00MB" 
    } 
}