-----------------------------------------+
| 1 | SIMPLE | m_db_vip | index_merge | i_m_db_vip_1,i_m_db_vip_2 | i_m_db_vip_1,i_m_db_vip_2 | 98,99 | NULL | 2 | Using union(i_m_db_vip_1,i_m_db_vip_2); Using where |
+------+-------------+-----------+-------------+-----------------------------+-----------------------------+---------+------+------+-------------------------------------------------------+
1 row in set (0.02 sec)
MariaDB [db_vip]> show status like '%cost%';
+-----------------+----------+
| Variable_name | Value |
+-----------------+----------+
| Last_query_cost | 6.826060 |
+-----------------+----------+
1 row in set (0.00 sec)
MariaDB [db_vip]>
SQL的执行成本已经大幅降低了，经开发已测试，效果相当不错，并发从10几个冲到2000以上。
|