Apply Diverse Technologies for System's Efficiency and Guaranteeing Data Security in Multi-user Working Environment Multi-casting technology Multi-step Locking technique Support Database of Huge Capacity Support Various Index B-tree, B+-tree, R-tree Fast and Efficient Data Transmission Using Compressing Technique Use compressing transfer technique for spatial data tables of huge capacity Various Spatial Query Features Provide spatial query features on the basis of spatial operators (Intersect, Disjoint, Contain, Equal, Touch, Within, Overleap, Cross, Envelop_intersect, index_intersect) Support OGIS Standard Spatial Data Types and Queries Support analysis of spatial topology based on OGIS standard Provide Diverse Interfaces for Developers of COM, ODBC, JDBC, CLI, etc Provide interfaces for RAD tools such as Visual C++, Visual Basic, Delphi, etc. Provide Various Utilities for User's Convenience Provide utilities to support efficient work of manager or user Support Spatial Views for User's Purpose and Needs Support Database Replication Provide Synchronization among database tables