A Semantic-Based Transaction Model for Active Heterogeneous Database Systems

This paper presents a framework to process the transactions under the active heterogeneous database systems. In order to perform a correct schedule of transactions with high performance, the framework provides a semantic-based concurrency control on the global level. It relaxes the correct criterion (global serializability) to allow the global sub-transactions on each site to execute in different order. The globe transaction includes data transactions and rule transactions. A data transaction is a general database transaction. A rule transaction is formed by active rules during the data transaction. During the global transaction process, both data and rule transactions are managed by different control modules. The data transaction will be decomposed into several globe sub-transactions. The globe semantic based transaction module will produce a correct parallel schedule for the global sub-transactions. The rule transaction may generate new global transactions during the rule inference. The advantage of providing semantic-based transaction on global level will reduce the abort producing by the wrong global order of local database schedule and improve the performance of the global transaction.