MySql表在MySql中创建和删除缓慢

Question

我们的查询日志很慢，说：

  

表的创建和删除耗时超过1小时   预计将在5至7分钟内完成。

LOGFILE ：

# Time: 171120 11:40:55
# User@Host: root[root] @ localhost []  Id: 35649
# Query_time: 6603.897055  Lock_time: 0.006114 Rows_sent: 0  Rows_examined: 5313105728
SET timestamp=1511178055;
CREATE table `table_1` as  SELECT id FROM  table_2;

# Time: 171120 11:40:56
# User@Host: root[root] @ localhost []  Id: 34286
# Query_time: 6312.637681  Lock_time: 0.000000 Rows_sent: 0  Rows_examined: 0
SET timestamp=1511178056;
drop table if exists `table_1`;

详细

MySQL Version: 5.6
Mysql engine: InnoDB
Total Tables : 760 + temp tables(create/drop)
Total Size : 70GB
RAM : 64 GB
InnoDB buffer pool size: 40G

问题：

调试问题的任何建议？