DATAPLEX: an access to heterogeneous distributed databases
Communications of the ACM
A formal model of trade-off between optimization and execution costs in semantic query optimization
Data & Knowledge Engineering
Transaction Processing: Concepts and Techniques
Transaction Processing: Concepts and Techniques
Overview of multidatabase transaction management
The VLDB Journal — The International Journal on Very Large Data Bases
Database Integration in a Distributed Heterogeneous Database System
Proceedings of the Second International Conference on Data Engineering
VLDB '92 Proceedings of the 18th International Conference on Very Large Data Bases
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Multidatabase systems enable organizations to integrate legacy database systems, and their applications, with newer database technology. One such legacy system is IBM'S Information Management System (IMs), a hierarchical database management system developed in the 1960s. Commercial IMS gateways typically suffer from poor performance and lack essential features needed to support updates. In this paper, we outline the engineering issues of constructing a multi-user IMS gateway that supports both client applications and ad-hoc requests. Our proposed architecture exploits the transaction management services of IMS/TM and the cross-memory services of MVS/ESA. Design features include run-time query optimization using an access plan cache and the use of IMS/TM message processing regions for database access. On the basis of performance and system programming considerations, we also discuss some implementation aspects of the gateway's design.