Very Large Global Environment Database System Allowing for Access through High Speed Network

近年来，通过FDDI、CDDI或ATM等高速网络访问数据库系统的需求越来越大。我们已经开发了全球环境数据库系统，该系统由大型卫星图像的海量存储和在线存档器组成。目前，我们迫切需要通过高速网络，特别是ATM网络，为全球环境数据库提供一种高效的访问方式。首先，我们考虑了一个分级文件系统，它提供了一种电影的临时数据访问和传输方法，并通过在我们的文件系统和ATM驱动程序之间设计分级传输协议来支持ATM网络的高效访问。然后，为ATM网络开发了一个特殊的驱动程序，以允许非常大的映像访问分层文件系统。通过ATM网络获取遥感数据的实验，对我们的系统进行了验证。实验结果表明，我们的分级文件系统和专用的ATM驱动程序对于大型全局环境数据库系统是有效的。在层次化文件系统上构建了卫星图像的图形用户界面和模式匹配机制，为远程用户通过ATM网络提供高功能的界面，因为满足用户检索方便、系统响应迅速、检索导航良好的需求也是大型全球环境数据库的重要组成部分。因此，我们提出了一种可以通过高速网络高效访问的分级文件系统，并构建了实验系统。从结果来看，我们证实了我们的原型全球环境数据库是一个高效的高速网络通信平台。

Recently, the demand for accessing the database system through a high speed network such as FDDI,CDDI or ATM becomes larger. Already we have developed the global environment database system which consists of mass storages and online archivers for large satellite images. Now, it is necessary for our global environment database to provide an efficient access method through a high speed network, especially, ATM network.First, we considered a hierarchical file system which provides a temporal data access and transfer method of movie, and supports an efficient access through ATM network by designing a hierarchical transfer protocol between our file system and ATM drivers. Then, a special driver for ATM network was developed to allow a very large image access to the hierarchical file systems. The experiment of accessing a remote sensing data through ATM network has been done in order to clarify our system. The experimental results showed that our hierarchical file system and special ATM driver are effective for large global environment database system. The graphical user interface and the pattern matching mechanism for satellite image was also constructed on the hierarchical file system to provide high functional interface for remote users through ATM network, since it is also important for a large global environment database to satisfy users' needs such as easy retrieval, quick response from system and good navigation for retrieval.Thus, we proposed a hierarchical file system which can allow efficient accessing through high speed network, which is coming in rapidly, and constructed the experimental system. From the results, we confirmed that our prototype global environment database is an efficient platform for high speed network communication.