Show the storage used by a database in MySQL

Show the storage used by a database in MySQL

Answer:

In previous article, we have already discussed how to list the database size in your MySQL server.

But if you want to have a more detail view on an individual database, you can try the following (crazy) SQL.

SELECT s.schema_name,
CONCAT(IFNULL(ROUND((SUM(t.data_length)+SUM(t.index_length)) 
/1024/1024,2),0.00),"Mb") total_size,
CONCAT(IFNULL(ROUND(((SUM(t.data_length)+SUM(t.index_length))-SUM(t.data_free))/1024/1024,2),0.00),"Mb")

data_used,
CONCAT(IFNULL(ROUND(SUM(data_free)/1024/1024,2),0.00),"Mb") data_free,
IFNULL(ROUND((((SUM(t.data_length)+SUM(t.index_length))-SUM(t.data_free)) 
/((SUM(t.data_length)+SUM(t.index_length)))*100),2),0) pct_used,
COUNT(table_name) total_tables
FROM INFORMATION_SCHEMA.SCHEMATA s
LEFT JOIN INFORMATION_SCHEMA.TABLES t ON s.schema_name = t.table_schema
WHERE s.schema_name = "mydatabase"
GROUP BY s.schema_name
ORDER BY pct_used DESC\G

It will give you something like the following..

 schema_name: mydatabase
  total_size: 165.09Mb
   data_used: 12.09Mb
   data_free: 153.00Mb
    pct_used: 7.33
total_tables: 133