Ever need to find the Data+Index size for your DB?
 Try this query:

SELECT DBName,
  CONCAT(LPAD(FORMAT(SDSize/POWER(1024,pw),3),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Data Size",
  CONCAT(LPAD(FORMAT(SXSize/POWER(1024,pw),3),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Index Size",
  CONCAT(LPAD(FORMAT(STSize/POWER(1024,pw),3),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Total Size"
FROM (
  SELECT IFNULL(DB,'All Databases') DBName,
  SUM(DSize) SDSize,
  SUM(XSize) SXSize,
  SUM(TSize) STSize
  FROM (
    SELECT table_schema DB,
      data_length DSize,
      index_length XSize,
      data_length+index_length TSize
    FROM information_schema.tables
    WHERE table_schema NOT IN ('mysql','information_schema','performance_schema')) AAA
    GROUP BY DB WITH ROLLUP
) AA,
(SELECT 2 pw) BB
ORDER BY (SDSize+SXSize);

A default install of MySQL has anonymous users and root users with access via ‘%’ (all outside hosts) and a generally useless ‘test’ database.
 The best method to do this is to execute the following at the shell prompt:

mysql_secure_installation

If this feature is not available, simply execute the following set of queries in MySQL:

DROP DATABASE `test`;
DELETE FROM `mysql`.`user` WHERE `User` = '';
DELETE FROM `mysql`.`user` WHERE `User` = 'root' AND `Host` != 'localhost';
FLUSH PRIVILEGES;