Database Systems (TODS)


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ACM Transactions on Database Systems (TODS), Volume 23 Issue 2, June 1998

Optimization techniques for queries with expensive methods
Joseph M. Hellerstein
Pages: 113-157
DOI: 10.1145/292481.277627
Object-relational database management systems allow knowledgeable users to define new data types as well as new methods (operators) for the types. This flexibility produces an attendant complexity, which must be handled in new ways for an...

Multiview access protocols for large-scale replication
Xiangning Liu, Abdelsalam Helal, Weimin Du
Pages: 158-198
DOI: 10.1145/292481.277628
The article proposes a scalable protocol for replication management in large-scale replicated systems. The protocol organizes sites and data replicas into a tree-structured, hierarchical cluster architecture. The basic idea of the protocol is...

Ensuring consistency in multidatabases by preserving two-level serializability
Sharad Mehrotra, Rajeev Rastogi, Henry F. Korth, Abraham Silberschatz
Pages: 199-230
DOI: 10.1145/292481.277629
The concept of serializability has been the traditionally accepted correctness criterion in database systems. However in multidatabase systems (MDBSs), ensuring global serializability is a difficult task. The difficulty arises due to the...