How can you determine how much disk space a particular MySQL table is taking up?

mysql

Is there a quick way to determine how much disk space a particular MySQL table is taking up? The table may be MyISAM or Innodb.

Solution 1:

For a table mydb.mytable run this for:

BYTES

SELECT (data_length+index_length) tablesize
FROM information_schema.tables
WHERE table_schema='mydb' and table_name='mytable';

KILOBYTES

SELECT (data_length+index_length)/power(1024,1) tablesize_kb
FROM information_schema.tables
WHERE table_schema='mydb' and table_name='mytable';

MEGABYTES

SELECT (data_length+index_length)/power(1024,2) tablesize_mb
FROM information_schema.tables
WHERE table_schema='mydb' and table_name='mytable';

GIGABYTES

SELECT (data_length+index_length)/power(1024,3) tablesize_gb
FROM information_schema.tables
WHERE table_schema='mydb' and table_name='mytable';

GENERIC

Here is a generic query where the maximum unit display is TB (TeraBytes)

SELECT 
    CONCAT(FORMAT(DAT/POWER(1024,pw1),2),' ',SUBSTR(units,pw1*2+1,2)) DATSIZE,
    CONCAT(FORMAT(NDX/POWER(1024,pw2),2),' ',SUBSTR(units,pw2*2+1,2)) NDXSIZE,
    CONCAT(FORMAT(TBL/POWER(1024,pw3),2),' ',SUBSTR(units,pw3*2+1,2)) TBLSIZE
FROM
(
    SELECT DAT,NDX,TBL,IF(px>4,4,px) pw1,IF(py>4,4,py) pw2,IF(pz>4,4,pz) pw3
    FROM 
    (
        SELECT data_length DAT,index_length NDX,data_length+index_length TBL,
        FLOOR(LOG(IF(data_length=0,1,data_length))/LOG(1024)) px,
        FLOOR(LOG(IF(index_length=0,1,index_length))/LOG(1024)) py,
        FLOOR(LOG(IF(data_length+index_length=0,1,data_length+index_length))/LOG(1024)) pz
        FROM information_schema.tables
        WHERE table_schema='mydb'
        AND table_name='mytable'
    ) AA
) A,(SELECT 'B KBMBGBTB' units) B;

Give it a Try !!!

Solution 2:

Quick bit of SQL to get the top 20 biggest tables in MB.

SELECT table_schema, table_name,
  ROUND((data_length+index_length)/POWER(1024,2),2) AS tablesize_mb
FROM information_schema.tables
ORDER BY tablesize_mb DESC LIMIT 20;

Hope that's useful to somebody!

Solution 3:

This won't be accurate for InnoDB tables. The size on disk is actually bigger than that reported via query.

Please see this link from Percona for more information.

https://www.percona.com/blog/2008/12/16/how-much-space-does-empty-innodb-table-take/

Solution 4:

In linux with mysql installed by default:

[you@yourbox]$ ls -lha /var/lib/mysql/<databasename>

based on NIXCRAFT's mysql db location