找出mysql中最大的表

SELECT 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'),concat(round(index_length/data_length,2),' idxratio'),concat(table_schema,'.',table_name) into outfile '/opt-backup/largetable.txt' FROM information_schema.TABLES ORDER BY data_length+index_length DESC LIMIT 10;