文说复制mysql> select * from t_message limit 10;  ...省略结果集  mysql> show status likelast_query_cost;  +-----------------+-------------+ | Variable_name   | Value       |  +-----------------+-------------+ | Last_query_cost | 6391.799000 |  +-----------------+-------------+  1.2.3.4.5.6.7.8.9.