Contains major dimensions into which database technology is being pushed by the needs of various applications and pulled by the chances of novel developments in hardware and systems architecture. This book covers extended database semantics: data models and data types, databases and logic, and expert system approaches to databases.

Types for data-oriented languages.- Optimization in a logic based language for knowledge and data intensive applications.- A Prolog interface to a Functional Data Model database.- The processing and evaluation of transitive closure queries.- Supporting semantic rules by a generalized event/trigger mechanism.- Optimal plan search in a rule-based query optimizer.- Information systems design: An expert system approach.- Multi-level transaction management, theoretical art or practical need?.- Views and security in distributed database management systems.- An overview of the distributed query system DQS.- TAILOR, a tool for updating views.- An intelligent information dictionary for semantic manipulation of relational databases.- A model of authorization for object-oriented and semantic databases.- A foundation for evolution from relational to object databases.- Col: A logic-based language for complex objects.- A universal relation model for nested relations.- Multilevel trie hashing.- Var-page-lru a buffer replacement algorithm supporting different page sizes.- The twin grid file: A nearly space optimal index structure.- A comparison of concatenated and superimposed code word surrogate files for very large data/knowledge bases.- Filter-based join algorithms on uniprocessor and distributed-memory multiprocessor database machines.- Placement of replicated items in distributed databases.- Optimizing voting-type algorithms for replicated data.- Quasi-copies: Efficient data sharing for information retrieval systems.- Process management and assertion enforcement for a semantic data model.- A uniform approach to constraint satisfaction and constraint satisfiability in deductive databases.- Geo-relational algebra: A model and query language for geometric database systems.- An extension of the relational model to support generic intervals.- Esprit: Trends & challenges in DB technology.- Project session on support for data and knowledge-based applications.- The algres project.- O2, an object-oriented data model.- Data base programming tools in the ATLANT language.- An overview of siderues: A graphical database schema editor for Galileo.- Towards KBMS for software development: An overview of the DAIDA project.- Entity-situation: A model for the knowledge representation module of a KBMS.- TELL-ME: A natural language query system.- Project session on distributed database applications.- PRISMA database machine: A distributed, main-memory approach.- SABRINA-RT, a distributed DBMS for telecommunications.- A multidatabase system for transnational accounting.- Multos: a document server for distributed office systems.- The DURESS project: Extending databases into an open systems architecture.