Hi I am new to databases. I am working on huge database and trying to clear up the mess. I want to start by finding the top ten tables that take up highest memory in the whole database. I cannot go by finding memory of each table since there are too many tables. I need the top 10 or 20 tables that take up the maximum space. Any help would be much appreciated. Thank you.
Maybe something like this:
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;