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		   B O S T O N   U N I V E R S I T Y
                                       
		      Computer Science Department
                                       
			  C O L L O Q U I U M
                                       
			Thursday March 14, 1996
                                       
				10:30 am
                                       
		      (Coffee served at 10:00 am)

			 Seminar Room / MCS 135

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			 The MultiView Project:
	    Object-Oriented View Technology and Applications

		      Elke Angelika Rundensteiner
    Assistant Professor, Electrical Engineering and Computer Science
		  Software Systems Research Laboratory
			 University of Michigan


   Object-oriented database (OODB) views provide powerful mechanisms for
   addressing important tasks ranging from interoperability of
   heterogeneous systems, data warehousing, to software evolution.  In the
   context of the the 5-year NSF-funded project at the University of
   Michigan, we have developed the first object-oriented view system
   MultiView using the commercial OODB Gemstone to support dynamic and
   updatable, incrementally materialized object-oriented views.

   In this talk, I will first present the MultiView approach for efficient
   incremental view maintenance.  Techniques covered include pruning of
   update propagation due to subsumption, distributed property registration
   and notification services, as well as satisfiability-path indices
   support.  An evaluation of these strategies based on our experimental
   studies on the MultiView system will be given.  Second, I will describe
   our related effort of utilizing MultiView as foundation for supporting
   transparent on-line modification of a shared object repository for
   evolving applications without disturbing existing ones.  Our transparent
   schema evolution (TSE) system, built on top of MultiView, computes a new
   view schema that reflects the semantics of the desired schema change,
   and restructures the underlying data store so as to guarantee
   information preservation.  TSE can handle all schema evolution
   operations typically supported by OODB systems as view definitions.

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For colloquium info, including directions, see http://cs-www.bu.edu/colloquium
   For more information contact Prof. Mark Crovella <crovella@bu.edu>
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