SQL query that returns a summary of the largest tables on the server.

find_largest_tables.sql

SELECT 
    CONCAT(table_schema, '.', table_name),
    CONCAT(ROUND(table_rows / 1000000, 2), 'M') rows,
    CONCAT(ROUND(data_length / (1024 * 1024 * 1024), 2),
            'G') DATA,
    CONCAT(ROUND(index_length / (1024 * 1024 * 1024), 2),
            'G') idx,
    CONCAT(ROUND((data_length + index_length) / (1024 * 1024 * 1024),
                    2),
            'G') total_size,
    ROUND(index_length / data_length, 2) idxfrac,
    engine
FROM
    information_schema.TABLES
ORDER BY data_length + index_length DESC
LIMIT 25;