How can I determine by database size in MySQL?

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MySQL
MySQL Database
Does anyone know if there's a specific query or function that can determine the size of my database in MySQL? If there isn't one, what's the best way to go about it? I tried this and it came up with 474989023196466.25 MB (even though I know the database is 400 MB).
SELECT CONCAT(sum(ROUND(((DATA_LENGTH + INDEX_LENGTH - DATA_FREE) / 1024 / 1024),2))," MB") AS Size FROM INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA like '%YOUR_DB_NAME%' ;

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Hi,

Sum up the data_length + index_length is equal to the total table size.

data_length – store the real data.
index_length – store the table index.
Here’s the SQL script to list out the entire databases size

SELECT table_schema “Data Base Name”, SUM( data_length + index_length) / 1024 / 1024 
“Data Base Size in MB” FROM information_schema.TABLES GROUP BY table_schema ;
Another SQL script to list out one database size, and each tables size in detail

SELECT TABLE_NAME, table_rows, data_length, index_length, 
round(((data_length + index_length) / 1024 / 1024),2) “Size in MB”
FROM information_schema.TABLES WHERE table_schema = “schema_name”;

Thanks & Regards
Clark Kent

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  • Brijesh
    Hi,

    Try this query :

    SELECT table_schema AS "Data Base Name", 
    sum( data_length + index_length ) / 1024 / 1024 AS "Data Base Size in MB" 
    FROM information_schema.TABLES GROUP BY table_schema ;

    Or with this, if you want to ROUND :

    SELECT table_schema AS "Data Base Name", 
    ROUND(SUM( data_length + index_length ) / 1024 / 1024, 2) AS "Data Base Size in MB" 
    FROM information_schema.TABLES GROUP BY table_schema ;
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