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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
of the storage driver, which is corresponded with the storage 
system. 
The Server Manager maintains the registered storage drivers for 
balancing the loads of INSERT operations. That is, it checks the 
status of storage system corresponding with the storage driver, 
and then informs the Storage Manager which storage system is 
most available to execute INSERT operations. 
The Connection Manager manages the distributed-index 
database that contains where locations are in distributed 
environment. When Storage Manager inserts locations into 
storage system through storage driver by issuing INSERT 
operation, Connection Manager inserts metadata into 
distributed-index database. In case of SEARCH operation, a 
Connection Manager looks up the servers in distributed-index 
database, and returns the list of relevant server information to 
Storage Manager. 
The Disk Manager examines periodically storage systems, such 
as Oracle, MS-SQL Server, ZEUS, or etc., which are registered 
on Server Manager. When it detects one of the storage systems 
full. it prohibits Storage Manager from inserting into the storage 
system. Storage Manager, however, could access the storage 
system for the purpose of retrieving locations. Disk Manager 
also provides system administrator with several utilities, such as 
IMPORT, EXPORT, BACKUP and RESTORE. 
The Storage Driver inserts locations of moving objects into 
corresponding storage system and search locations with specific 
predicates. 
7. CONCLUSION 
In this paper, we have designed the moving objects database for 
a large number of moving objects. And we have also 
implemented moving object components and SQL processing 
system on Microsoft Windows .Net Environment using C4. We 
integrated various kinds of works related to moving objects into 
one system, and newly proposed a data model for moving 
objects, a location query language, an indexing framework, and 
a method for storing moving objects. The system we proposed 
supports a diverse set of location acquisition policies, location 
indexes and location storages. Therefore, it is expected to be 
applied into various kinds of location based services practically. 
As future work, we should make extensive experiments with 
real environments to measure the performance of MODB, and 
develop algorithms to enhance the performance of location 
query processing. 
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