A solution for concurrency control and long transaction management in SDBMS

The problem of long transactions is a significant problem in spatial database. The checkout mechanism and multi-version mechanism are two kind methods of solving the problem of long transactions. In this paper,we present a Shallow Version Management mechanism to realize multi-version mechanism in spatial database. And we introduced a increment storage and dynamic version views building method to improve efficiency of storing and consulting. We also illuminate how to resolve the problem of long transaction concurrency contrrl in spatial database by using multi-version mechanism. At the end of this paper,we introduce some required means like converge,compress and delete.     

A solution for concurrency control and long transaction management in SDBMS

The problem of long transactions is a significant problem in spatial database. The checkout mechanism and multi-version mechanism are two kind methods of solving the problem of long transactions. In this paper, we present a Shallow Version Management mechanism to realize multi-version mechanism in spatial database. And we introduced a increment storage and dynamic version views building method to improve efficiency of storing and consulting. We also illuminate how to resolve the problem of long transaction concurrency control in spatial database by using multi-version mechanism. At the end of this paper, we introduce some required means to version management in spatial database, like converge, compress and delete.     

面向对象数据库中并发控制机制的研究与设计

给出了面向对象数据库系统的一种并发控制机制－ＯＯ－Ｌｏｃｋｉｎｇ，分析了面向对象数据库系统中事务模型的两个方面：操作和对象，并利用事务的操作和操作对象对语义来提高并发度，讨论了复杂对象和多继承类层次上的封锁技术，提出了三种锁：类锁、对象锁和条件锁，较好地描述了操作之间的冲突性和可交换性。部分技术已用于ＣＩＭＳ环境下面向对象数据库系统ＦＯＯＤＢ２．０的实现的。     

An efficient spatio-temporal data structure for multi version management of engineering drawings

In the engineering database system, multiple versions of a design including engineering drawings should be managed efficiently. The paper proposes an efficient spatial data structure, that is an expansion of the R-tree and HR-tree, for version management of engineering drawings. A novel mechanism to manage the difference between drawings is introduced to the HR-tree to eliminate redundant duplications and to reduce the amount of storage required for the data structure. Data management mechanism and structural properties of our data structure called the MVR -tree are described.