Tioga: Providing Data Management Support for Scienti c Visualization Applications

We present a user interface paradigm for database management systems motivated by scienti c visualization applications. Our graphical user interface includes a \boxes and arrows" notation for database access and a ight simulator model of movement through information space. We also provide means to specify a hierarchy of abstracts of data of di erent types and resolutions. In addition, multiple portals on data may be related as master and slaves. The underlying DBMS support for this system includes the compilation of query plans into megaplans, new algorithms for data bu ering, and provisions for a guaranteed rate of delivery.