OODBMS Products and Their Evolution in Java

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OODBMS Products and Their Evolution
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In this section we discuss the object-oriented database management systems that, in our opinion, most heavily influenced the field. For each system, we highlight the aspects that have been investigated prominently, and the peculiar characteristics that impacted the ODMG standard as well as other OODBMSs. This is not an exhaustive and detailed survey; for each system we discuss its most relevant and noteworthy features, and its main evolution from earliest releases.
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The ORION next-generation databases project in the Advanced Computer Technology (ACT) Program at the Microelectronics and Computer Technology Corporation (MCC) in Austin, Texas, started at the end of 1985 and completed at the end of 1989, under the direction of Dr. Won Kim. The ORION system was developed to provide direct support to the object-oriented paradigm, as well] as innovating features to CAD/CAM and artificial intelligence (AI) applications. In particular, it has been used to provide persistence to the Proteus expert system developed in the same project. The ORION project prototyped a family of three next-generation database systems. MCC released the first prototype, ORION-1 (implemented in Common Lisp), in May 1987, as a single-user system. MCC extended ORION-1 to the ORION-1SX prototype system and released it to the shareholder companies in April 1988. ORION-1SX was a multi-user system with a multiclient, single-server architecture. The third prototype, ORION-2, introduced a distributed, object-oriented architecture for a multi-user environment. MCC released the third prototype to shareholder companies in July 1989.
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ORION-2 has a multiclient, multiserver architecture. Having met its objectives, MCC stopped all work on ORION at that time. Over five million do!lars was spent for the three generations of prototypes. Most of the results achieved in the project are reported in "Introduction to Object-Oriented Databases" [Kim 1990]. A peculiar feature of the distributed architecture of ORION-2 is the distinction between shared and private databases. The shared database is distributed across workstations (sites) in a network. An ORION-2 server controls the partition of the shared database at each site. ORION-2 clients provide transparent access to the various partitions of the shared database. The architecture allows any number of private databases at each distributed database site, and data can move between private and shared databases. Private databases store private data that is not shared with other users of the database. The architectural issues for object-oriented databases that the ORION project has addressed include dynamic schema evolution, versions and change notification, composite objects, query model, automatic query optimization, indexing, transaction management and concurrency control, authorization, and multimedia data management. The ORION project was the first to publish detailed foundational papers on many of these topics. Since August 1990, an extension and commercialization of the ORION-2 prototype from MCC is sold as the product Itasca. Itasca Systems has added major enhancements and features, improved the performance, and strengthened the code. It now runs on UNIX systems from multiple vendors and is an industrial-strength, documented product, for which several tools have been developed. Itasca is now distributed by IBEX Knowledge Systems S.A. IBEX has joined the ODMG consortium after the first release of the standard, and has been a voting member of ODMG since the release 2.0 of ODMG in 1997.
The Alta r consortium developed O2 as a result of a five-year project that began in September 1986. Its goal was to implement a next-generation database system. The fiveyear period was divided into two phases: a three-year prototyping period and a twoyear development phase. A first throwaway prototype was demonstrated in December 1987, and a second working prototype was completed in March 1989, although work continued to improve upon it until September 1989, when it was released to a set of selected partners for evaluation. O2 Technology released O2 as a product in 1991. The focus of the project, whose history and main results are collected in "Building an Object-Oriented Database System: The Story of O2" [Bancilhon 1992] was on programming languages and environments, rather than on architectural issues. Programming tools as well as a user interface generator have been developed as part of the project. Considerable research results have been achieved concerning the formal definition of the data model and the specification of a declarative, SQL-like algebraic query language. From September 1992 until November 1995, the European Project GOODSTEP had investigated the use of O2 as the basis for a Software Engineering Environment, with the goal to enhance and improve the product. In the context of the GOODSTEP project the following issues have been investigated for O2: schema evolution, versions, view mechanisms, triggers, and concurrency control (in particular, the extension of the original page-based mechanism to an object-level mechanism). The first two features have been integrated in the product since version 4.6, released in 1995.
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