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Database visualization helps users process, interpret, and act upon data in large data storage. In this paper, we present a Java-based 3D database visualization tool, J3DV. It successfully solved the problem of data management faced by many other visualization systems by integrating multiple data sources with the visualization tool. It utilizes twolevel mapping to transform the data into intermediate data, which can be used to render graphs, and which offers better performance with a two-tier cache. |This visualization tool presents a sound framework, which has good extensibility for plugging in new data sources, supporting new data models and visual presentation types and allowing new graph layout algorithms.