类型扩充 meaning in English

type extension

I study mainly the storage of record and object , and bring forward the method of storage when the instance of object is embodied inside of record . 3 ) in the aspect of indexing , i presented a method that is generalized b - tree ( gbt ) and combining technique of founction template of c + + build the universal algorithm of queries , insert and delete . 4 ) finally , i analyze deeply and improve the query processing system of ormdbms , and confirm performance algorithm of linking and queries based on relational database . management system ( rdbms )
在系统结构和特性中分析了系统所采用的两层体系结构，并且详细探讨了在设计和实现数据库时所涉及到的几个主要问题：支持复杂对象、类型扩充、继承机制和规则系统等；在存储机制的讨论中，主要研究了记录和对象以及包含了对象实例记录的存储方法；在索引技术研究中，本文提出了类属b树的索引方法，通过c + +的函数模板技术给出了通用类属b树查询、插入及其删除的基本算法；最后，文章以关系数据库为基础，深入分析并改进了在对象关系多媒体数据库中的查询处理系统，确定了选择和连接操作的具体算法。