SYMPOSIUM MINISYMPOSIA

MINISYMPOSIUM ABSTRACT

Distribution of Spatial Data presents challenges that do not exist in distributing ordinary data. Spatial objects are more complex than ordinary objects. They can be composed of a single object or a series of objects (for example, an area can be defined by a series of connected lines). This requires the use of an object oriented database to hold and manage the spatial information. In distributing objects over several machines, the areas of horizontal fragmentation, vertical fragmentation, and replication need to be addressed. This is more complicated than the fragmentation and replication of relational data because of the complexity of the objects.

Not only is spatial data more complex, but the queries that are performed on spatial data are a superset of regular SQL. The queries include a number of geometric operations, such as "contains" and "nearest". These additional operations make more options apparent for distribution, therefore making the decision about how to distribute the spatial objects more difficult.

The issues involved in distribution of spatial objects will be discussed, including how objects in general should be distributed. Additionally, preliminary results from experimentation in distribution of spatial objects will be presented. These will be compared to results of experiments in distributing ordinary objects (those that do not contain spatial attributes). ~

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