Abstract
Object-Oriented databases are becoming increasingly popular in business. Issues such as query optimization, analysis and design techniques, and concurrency control have been addressed as they pertain to the relational model but have not been addressed as they apply to the object-oriented model. This paper includes the framework development and description of a concurrency control mechanism named O2C2 which is specifically designed for an object-oriented database. O2C2 is a lock–based concurrency control mechanism that forms the basis of this research. A description of database concurrency control and object-oriented database precepts are presented to provide a basis for a comprehensive framework for concurrency control in object-oriented databases. The theory is developed along four specified dimensions which are the hierarchical level dimension, the data type dimension, the composite or complex objects dimension and transaction type dimension. Additionally, a comprehensive list of rules is given that are crucial to an object-oriented database concurrency control mechanism. The rules are given to provide a basis not only for the O2C2 mechanism, but for any object-oriented database concurrency control mechanism. The O2C2 mechanism is then presented after which a discussion ensues about the possible transaction types in order to demonstrate the robustness of the mechanism.
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