CONCURRENT RULE EXECUTION IN ACTIVE DATABASES

An active DBMS is expected to support concurrent as well as sequential , rule execution in an efficient manner. Nested transaction model is a suitable tool to implement rule execution as it can handle nested rul e firing and concurrent rule execution well. In this paper, we describ e a concurrent rule execution model based on parallel nested transacti ons. We discuss implementation details of how the flat transaction mod el of OpenOODB has been extended by using Solaris threads in order to support concurrent execution of rules. Copyright (C) 1998 Published by Elsevier Science Ltd. All rights reserved.