Efficiently updating materialized views
SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
Equivalence, query-reachability and satisfiability in Datalog extensions
PODS '93 Proceedings of the twelfth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
A softbot-based interface to the Internet
Communications of the ACM
Data model and query evaluation in global information systems
Journal of Intelligent Information Systems - Special issue: networked information discovery and retrieval
Efficient maintenance of materialized mediated views
SIGMOD '95 Proceedings of the 1995 ACM SIGMOD international conference on Management of data
Query reformulation for dynamic information integration
Journal of Intelligent Information Systems - Special issue on intelligent integration of information
Efficient view maintenance at data warehouses
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Integrating the rewriting and ranking phases of view synchronization
Proceedings of the 1st ACM international workshop on Data warehousing and OLAP
Maintaining data warehouses over changing information sources
Communications of the ACM
Query Optimization in Database Systems
ACM Computing Surveys (CSUR)
Common expression analysis in database applications
SIGMOD '82 Proceedings of the 1982 ACM SIGMOD international conference on Management of data
Optimization of Queries with User-defined Predicates
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
The CVS Algorithm for View Synchronization in Evolvable Large-Scale Information Systems
EDBT '98 Proceedings of the 6th International Conference on Extending Database Technology: Advances in Database Technology
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Views over distributed information sources rely on the stability of the schemas of these underlying sources. In the event of meta data changes in the sources, such as the deletion of a table or column, such views may become undefined. Using meta data about information redundancy and user preferences, views can be evolved as necessary to be defined on a modified information space after a source meta data change, while assuring the best possible compliance to preferences that users may have. Previous work in view synchronization focused only on deletions of schema elements. We now offer the first approach that makes use of additions also. The algorithm is based partly on returning view definitions to previous versions by "backtracking" in the history of views and meta data. This technology enables us to adapt views to temporary meta data changes by cancelling out opposite changes and allows undo/redo-operations on meta data without deteriorating the quality of the view. The mechanism described in this paper will therefore improve the quality of evolved views.