The Sixth International Workshop on Persistent Object Systems was held at Les Mazets des Roches near Tarascon, Provence in southern France from the fifth to the ninth of September 1994. The attractive context and autumn warmth greeted the 53 participants from 12 countries spread over five continents. Persistent object systems continue to grow in importance. Almost all significant uses of computers to support human endeavours depend on long-lived and large-scale systems. As expectations and ambitions rise so the sophistication of the systems we attempt to build also rises. The quality and integrity of the systems and their feasibility for supporting large groups of co-operating people depends on their technical founda­ tion. Persistent object systems are being developed which provide a more robust and yet simpler foundation for these persistent applications. The workshop followed the tradition of the previous workshops in the series, focusing on the design, implementation and use of persistent object systems in particular and persistent systems in general. There were clear signs that this line of research is maturing, as engineering issues were discussed with the aid of evidence from operational systems. The work presented covered the complete range of database facilities: transactions, concurrency, distribution, integrity and schema modifica­ tion. There were examples of very large scale use, one involving tens of terabytes of data. Language issues, particularly the provision of reflection, continued to be important.

Inhalt

Object Store Engineering.- Expressing Object Residency Optimizations Using Pointer Type Annotations.- Concurrent Shadow Paging in the Flask Architecture.- Object Store Engineering 2.- Buffering Long Externally-Defined Objects.- Protection in Grasshopper: A Persistent Operating System.- An Efficient Pointer Swizzling Method for Navigation Intensive Applications.- Object Caching.- Hybrid Caching for Large-Scale Object Systems.- Prefetch Support Relations in Object Bases.- Concurrency.- Semantic Synchronization in a Persistent Object Library.- Customizing Concurrency Controls Using Graph of Locking Capabilities.- Object Store Engineering 3.- Using C as a Compiler Target Language for Native Code Generation in Persistent Systems.- Garbage Collection of Persistent Objects in Distributed Shared Memory.- Applications of Persistent Object Systems 1.- Making Real Data Persistent: Initial Experiences with SMRC.- Managing Physical Folios of Objects Between Nodes.- Analysing Persistent Language Applications.- System Evolution.- Storage Class Extensibility in the Brown Object Storage System.- Correctness of Lazy Database Updates for Object Database Systems.- Changing Persistent Applications.- Reflection and New Language Constructs.- Conch: Experimenting with Enhanced Name Management for Persistent Object Systems.- Type-Safe Linguistic Run-Time Reflection - A Practical Perspective.- START: A Linguistic Reflection Tool Using Hyper-Program Technology.- DAIS: An Object-Addressed Processor Cache.- Hardware Support for Stability in a Persistent Architecture.- Optimisation.- Object Clustering in Persistent and Distributed Systems.- Query Processing in PIOS.- Application of Persistent Object Systems 2.- Type-Safe Inter-Application Communication in the Feynman Persistent Environment.- A Toolkit to Support Scalable Persistent Object Base Infrastructures.- Keynote Discussion on Evolution in Persistent Systems.- Persistent Systems Engineering.- A Global Perspective of Schema Modification Management for Object-Oriented Databases.- Distributed Galileo: A Persistent Programming Language with Transactions.- Constructing a Domain-Specific DBMS Using a Persistent Object System.- Concluding Remarks.- Author Index.