From OO Through Deduction to Active Databases ROCK, ROLL RAP

摘要

One important thread within advanced database systems research is the notion of rule-based database systems. The power of definite rules coupled with relational technology has led to the emergence of deductive databases. However, while this type of database system provides more advanced functionality, it suffers from other limitations of relational database systems such as the lack of data structures. The realisation that the object-oriented approach is complementary to the deductive one and that the two can be combined to produce deductive object-oriented databases with all the benefits of both represents an important breakthrough for rule-based database systems. An alternative to the deductive rule approach is the active rule approach. Active rules are more powerful than deductive rules but lack the advantages of the sound theoretical foundation of the latter. The two ideas can be combined to produce an active DOOD provided that the integration is treated with care.