get largest 10 tables in all SQL databases

largest_tables.sql

-- http://www.mysqlperformanceblog.com/2008/02/04/finding-out-largest-tables-on-mysql-server/
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
FROM
    information_schema.TABLES
ORDER BY
    data_length + index_length DESC
LIMIT
    10;