A recursive algebra for nested relations
Information Systems
Data models, database languages and database management systems
Data models, database languages and database management systems
Incremental maintenance of views with duplicates
SIGMOD '95 Proceedings of the 1995 ACM SIGMOD international conference on Management of data
Incremental Recomputation of Active Relational Expressions
IEEE Transactions on Knowledge and Data Engineering
Maintaining Temporal Views over Non-Temporal Information Sources for Data Warehousing
EDBT '98 Proceedings of the 6th International Conference on Extending Database Technology: Advances in Database Technology
Incremental Maintenance of Nested Relational Views
IDEAS '99 Proceedings of the 1999 International Symposium on Database Engineering & Applications
Incremental maintenance of aggregate and outerjoin expressions
Information Systems
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Incremental equations form an important method for incrementally maintaining materialized views. In this paper, we derive incremental equations for the general nested relational model, a data model in which incremental equations have not been derived to the best of our knowledge and a data model which is used in warehouses and in XML data. We derive incremental equations based on two types of nested relational algebra, non-recursive and recursive. We then compare the patterns of the equations for the two algebras. Relying on the equations, we propose a view maintenance algorithm to maintain views when they are defined with multiple operators.