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get largest 10 tables in all SQL databases
-- 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;
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