mwang@watmath.UUCP (mwang) (08/01/85)
DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
DATA STRUCTURING SEMINAR
- Thursday, August 8, 1985.
Miss C.B. Medeiros, a graduate student of this depart-
ment, will speak on ``A New Approach to the View Update
Problem.''
TIME: 2:30 PM (Please Note)
ROOM: MC 5158
ABSTRACT
A database view is the part of a database that is
needed by an application. Views are generally employed
to allow users to query (i.e., VIEW) some parts of the
database without interfering with other users, and to
prevent access to confidential information. Updates
through views are usually forbidden, because a user
might unknowingly destroy another's data.
The presentation will show a new approach to
updating through views, examining how views can actu-
ally be designed to permit a large class of updates.
This approach generalizes the results of other view
design tools, and allows the view designer to specify
and check the result of update operations which have
been traditionally forbidden. This has the advantage of
increasing the flexibility in designing user interfaces
- more alternatives for acceptable updates are
presented, and users are given more control over their
application.
The talk will focus on the issues of integrity
constraint maintenance and side effect propagation.
August 1, 1985