Carlos Perez Leguizamo

Autonomous decentralized database system for assurance in heterogeneous e-business

Due to the advancement in the Information Technology, different kind of companies with heterogeneous needs have had the necessity to cooperate among them to get more benefit in a continuous changing market. That is heterogeneous e-business. In order to cope with such kind of e-business, a platform which can effectively realize heterogeneous needs, real time, flexibility and fault-tolerance is needed. This paper focuses on the database field that is indispensable for the e-business. Thus, it proposes Autonomous Decentralized Database System, which is composed of two techniques. In the first one, the concept of Allowable Volume (AV) is introduced, while in the second one, a Mobile Agent (MA) that adjusts the AV of each site is shown. Since the MA is always moving among the sites, and each site can always negotiate AV with the MA autonomously, the system can realize assurance. Furthermore, the effectiveness of the proposed system is shown by simulation.

Mobile agent fault tolerance in autonomous decentralized database systems

In the background of e-business, the autonomous decentralized database system has been proposed to cope with the dynamic and heterogenous requirements of users. In a diversified environment of service provision and service access, the ADDS provides flexibility to integrate heterogeneous and autonomous systems while assuring the timeliness and high availability. In this system, mobile agent based updates has been shown effective to resolve the consistency issue. The use of mobile agent, however, is critical and requires reliability in regard to mobile agent failures that may lead to bad response time and hence the availability of the system may lost. In this paper, we propose technique for resolving the mobile agent failures that are the most critical aspect of fault tolerance in the system. The technique employs only the local knowledge of the system hence the autonomy and decentralization of the system are preserved.

Fault tolerance technology for autonomous decentralized database systems

The Autonomous Decentralized Database System (ADDS) has been proposed in the background of e-business in respect to the dynamic and heterogeneous requirements of the users. With the rapid development of information technology, different companies in the field of e-business are supposed to cooperate in order to cope with the continuous changing demands of services in a dynamic market. In a diversified environment of service provision and service access, the ADDS provides flexibility to integrate heterogeneous and autonomous systems while assuring timeliness and high availability. A loosely-consistency management technology confers autonomy to each site for updating while maintaining the consistency of the whole system. Moreover, a background coordination technology, by utilizing a mobile agent, has been devised to permit the sites to coordinate and cooperate with each other while conferring the online property. The use of mobile agent, however, is critical and requires reliability with regard to mobile agent failures that may lead to bad response times and hence the availability of the system may lost. A fault tolerance technology is proposed in order that the system autonomously detect and recover the fault of the mobile agent due to a failure in a transmission link, site or bug in the software. The effectiveness of the proposition is shown by simulation.

Autonomous multi-agent-based data allocation technology in decentralized database systems for timeliness

Due to the progress of information technology, the business market is changing its strategy for a modern online business environment. Autonomous decentralized database system (ADDS) has been proposed in order to meet the innovative e-business requirements. In case the system size increases, a multiple-agent-based coordination is proposed for achieving the timeliness property. The response time is conformed by those transactions that require coordination and those that can be satisfied immediately. In this sense, the distribution of the data in the system for coordination is a medullar issue for the improvement of the response time. A trade-off exits between these two kind of transactions depending on the capacity of allocating data among the sites and the distribution of the data and user requests in the system. A study of the trade-off and the factor that need to be considered for an allocation data technology in order to get an optimal response time is discussed.

Autonomous decentralized database system reconstruction technology through mobile agent monitoring and coordination

Due to the progress of information technology and wide spread of e-business, the market has become diversified and highly dynamic based on changing users preferences. To meet the extensive competition in a dynamic environment, autonomous decentralized database system based on autonomous coordinating subsystems has been proposed. Autonomy and decentralization of subsystems help achieving high response time in highly competitive situation and an autonomous mobile agent based coordination has been proposed to achieve flexibility in a highly dynamic environment. Further, the system is provided with autonomous reconstruction to coordinate the heterogeneous requirements of multiple subsystem. Based on the complementary requirements of the subsystems, heterogeneity distribution has been defined to accomplish the reconstruction process. This autonomous reconstruction consists of autonomous division and autonomous integration of the system, based on the ever changing situation, to assure high response time.

Assurance reconfiguration technology in decentralized database systems by an autonomous restructure mobile agent

In the recent years, the society has suffered several changes in its ways and methods of consuming. The companies are providing services through the Internet to large number and uncertain customers. The customers require one-click service and their preferences changes dynamically. Autonomous decentralized database system (ADDS) is proposed as a system architecture in order to realize assurance in distributed database systems that support e-business. A background coordination technology, performed by an autonomous mobile agent, is devised to adapt the system to evolving situations. The system can achieve timeliness by allocating the information in advance among the sites that has different time constraints for updating. Further, the system is provided with an autonomous reconstruction technology to coordinate the heterogeneous requirements when the size of the system increases. Based on a autonomous restructure mobile agent (RMA), which autonomously determines how many sites and which sites should be restructured to improve the response time, this technique can adapt the system to the evolving situation dynamically. Thus, the assurance of the system can be maintained. A simulation shows the effectiveness of the proposed technology.

Autonomous decentralized database system restructuring for achieving timeliness

Summary form only given. The companies are providing services through the Internet to large number and uncertain customers. The customers require one-click service and their preferences changes dynamically. Hence, the database systems support e-business processes required to be timeliness and adaptable to the changing preferences. Autonomous decentralized database system (ADDS) is already proposed as architecture for achieving these needs. An autonomous mobile agent based coordination has been proposed to achieve exibility in a highly dynamic environment. Further, the system is provided with autonomous reconstruction to coordinate the heterogeneous requirements when the size of the system increases. Based on an autonomous restructure mobile agent (RMA), which autonomously determines how many sites and which site should be restructured to improve the response time, this technique can adapt the system to the evolving situation dynamically for achieving timeliness. A simulation shows the effectiveness of the proposed technique in large-scale system.

Autonomous consistency coordination technique among distributed database systems for achieving high reliability

Recently, market and user preferences have been drastically changing; user oriented production and logistic systems such as the supply chain management system have been required. In this kind of system, different subsystems with heterogeneous level of reliability have to coexist while trying to preserve the one click response and the flexibility in order to satisfy the frequently changing and heterogeneous preferences of the users. Thus assurance is required. An autonomous decentralized database system is proposed in order to realize the assurance. In this architecture, every site can autonomously control its own database within a permissible value, and coordinate among the sites by a mobile agent. Moreover, the autonomous consistency coordination technique is proposed in order to solve the problem of integrating and keeping the consistency of DB systems with heterogeneous levels of reliability. This technique is based on the inherent properties of autonomous decentralized systems (ADS) to attain the on-line property by the use of a data field among the replicated sites. Furthermore, an evaluation of the proposed technique is showed.