Conventional transaction management in shared databases is traditionally viewed as a combination of two orthogonal problems. One is to guarantee correctness when several transactions are executed concurrently. This is ensured by the concurrency control component of a transaction processing system. The other is to ensure the correctness of the database in spite of transaction aborts and system f...

Relational database management systems lack the requisite support for specialized applications such as engineering databases, electronic design databases, geographic databases, etc. Extensible database management systems attempt to ll this void by providing capabilities to deene query language extensions and specialized storage structures that suit the particular application. However, they do n...

Concurrency control is one of the main issues in the studies of real-time database systems. On the one hand, it is related closely to active real-time database and real-time application. Concurrency control algorithm seriously affect the performance of the system in real-time, may cause unpredictable consequences. On the other hand, updating data in active real-time database may trigger a new t...

The task of concurrency control is to synchronize the user transactions on this data base and with this to avoid conflicts that lead to faulty or inconsistent data. Concurrency control has been subject to active research for quite some time and several concurrency control algorithms have been proposed and implemented. The relative performance of these methods varies depending on the system envi...

Mobile agents are autonomous objects that can migrate from one host to another within a computer network. Concurrent execution of multiple mobile agents requires a concurrency control for data consistency. Some mobile agent applications, such as information retrieval, do not need a concurrency control, but most applications, for example workflow and electronic commerce, require such a control o...

Relational database management systems lack the requisite support for specialized applications such as engineering databases, electronic design databases, geographic databases, etc. Extensible database management systems attempt to ll this void by providing capabilities to deene query language extensions and specialized storage structures that suit the particular application. However, they do n...