Localizar tabela com número máximo de linhas em um banco de dados no mysql

SELECT TABLE_NAME,MAX(TABLE_ROWS)
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = "DB_Name";

SELECT CONCAT('SELECT COUNT(*) as cnt FROM ', table_name, ' union all') 
      FROM information_schema.tables WHERE table_schema = 'your_db_name';

select max(cnt) from (paste the result of first query and remove 
last union all keyword) as tmptable;