云数据库查询优化中半连接序列方法的应用研究

The Application Research of Semijoin Sequence Method in the Query Optimization of Cloud Database

交接操作是云数据库的常用操作，一般应用于查询过程，缺点是费时，而且代价较高。云数据库一般应用于数量庞大的重复查询操作，在此基础上，为了解决查询效率低的问题，并尽量缩短计算时间和传输时间，着重优化了云数据库中的半连接过程。经过优化后的半连接查询算法能够大大减小云数据库的网络传输数量，从而有效地减少其中间结果数据量。因此，该优化技术能够切实有效地解决复杂查询问题。

The handover operation is a common operation in cloud database, generally applied in the query process, but it is time -consuming and the cost is higher. The cloud database is gen- erally applied to the huge number of duplicate query operation, on this basis, in order to solve the problem of low query efficiency, and shorten the computing time and transmission time as far as possible; we focus on optimizing the semi -join process of the cloud database. The semi - join query algorithm after the optimization can reduce the number of network transmission of cloud database greatly; thereby reduce the amount of data of the intermediate results effectively. Thus, the optimization technology can solve the problem of complex queries effectively.