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Coloured Petri net-based modeling for distributed relational database queries

JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS 2006年第6期29卷 1029-1039页

作者： Chen, Pe-Te Chen, Yu-Tsai Yang, Chen-Chau Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei 106 Taiwan

In this paper, a new application of colour timed Petri net (CTPN) based methodology for distributed relational database queries modeling and corresponding simulation is addressed. This work, first based on parsed query definitions, converts logical query plans into designed CTPN models. Later, the improved cost-based functions are then established and appended to CTPN with a general purpose CPN simulator-Design/CPN to observe the thresholds of query operations. The propose CTPN can be used in the design phase as an experimental prototype to automatically simulate distributed database query processing which, in turn, may considerably reduce the load of developing the actual query processing software in the logical design phase of a distributed database system. Also, since all the essential details of query processing in CTPN have been simulated, the results of this study can be closely related to real world applications.

关键词： distributed database modeling coloured Petri nets query processing

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A distributed mobile database implementation on Pocket PC mobile devices communicating over Bluetooth

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JOURNAL OF NETWORK AND COMPUTER APPLICATIONS 2009年第1期32卷 96-115页

作者： Artail, Hassan Shihab, Manal Safa, Haidar Amer Univ Beirut Dept Elect & Comp Engn Beirut 11072020 Lebanon Amer Univ Beirut Dept Comp Sci Beirut 11072020 Lebanon

This paper describes a distributed database system implementation built on top of stand-alone mobile databases found on mobile devices. At the heart of the architecture are elected devices that take on the role of data directories which collect the schema of the databases and become the contact points for all nodes that wish to submit queries against the distributed database. The system is implemented on Pocket PCs that run the Microsoft WinCE operating system and communicate using Bluetooth, thus limiting the architecture to eight devices, which is a restriction imposed by piconets. Sample databases were configured on the devices that ran the SQL Server CE database engine, and a list of 170 sample queries of varying complexities were designed to conduct performance evaluation. This evaluation involved measurement of query response time, generated traffic, and device energy consumption. The obtained results indicated the feasibility of the system and its potential for providing mobile users with a framework for aggregating disparate data that are stored in mobile databases in the wireless ad hoc network. (C) 2008 Elsevier Ltd. All rights reserved.

关键词： Data availability Mobile databases distributed database Mobile computing Bluetooth

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Utilizing Java technology and CORBA for developing three-tier distributed multimedia database system

Utilizing Java technology and CORBA for developing three-tie...

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7th International-Business-Information-Management-Association Conference (IBIMA)

作者： Noor, A. S. M. Saman, M. Y. M. Univ Coll Sci & Technol Dept Comp Sci Fac Sci & Technol Kuala Terengganu 21030 Malaysia

ISBN: (纸本)9780975339367

While some two-tier application is a valid approach for distributed applications, limitations have become apparent, particularly in large enterprises. Often these applications did not face the challenges and problem of applications integration, efficiency and scalability. Organizations that have a strong need for applications integration, efficiency, scalability and flexibility have begun to build applications following a new model that of distributed application components mostly in the form of three-tier architecture. This paper describes a research project in the area three tier distributed object multimedia database client-server system utilizing Common Object Request Broker Architecture (CORBA) and Java technology. This system called Science Education Repository, System is a three-tier distributed Multimedia database System used to store and manipulate related information. The three-tier architecture has emerged to overcome the limitations of the two-tier architecture. This architecture extends the two-tier model by adding another tier in the Middle between the client and the server. This tier is called middleware. In this architecture, a middle tier has been added between the user system interface client environment and the database management server environment. The architecture is useful for an effective distributed client/server design is needed that provides (when compared to the two tier) increased performance, flexibility, maintainability, reusability, and scalability, while hiding the complexity of distributed processing from the user.

关键词： multimedia Java Java media framework streaming audio/video distributed database

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A new method to recognize the images in distributed multimedia database based on fuzzy query

A new method to recognize the images in distributed multimed...

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1st International eConference on Computer and Knowledge Engineering (ICCKE)

作者： Alavi, M. Chahardoli, R. Rsouli, S. Islamic Azad Univ Dept Comp Engn Hamadan Branch Hamadan Iran Appl Sci & Technol Jahad Branch Hamadan Iran

ISBN: (纸本)9781467357135;9781467357128

there are basic differences between multimedia databases and traditional databases, which raise new issues such as fuzzy queries. In the recent years, fuzzy queries in multimedia database have been paid attention to greatly and developed the applications of this field remarkably. An application of multimedia database is to identify the person' image for which image process techniques are used. In this paper, we suggest a new method to identify the persons' face image in distributed database based on fuzzy queries with specific weighing. The results show that the suggested method vitas much more accuracy and less search time rather than the previous algorithms which used image processing algorithms.

关键词： multimedia database distributed database Weighted fuzzy query Authentication Fuzzy description

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Low-power distributed NoSQL database for IoT Middleware 5

Low-power Distributed NoSQL Database for IoT Middleware

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5th ICT International Student Project Conference (ICT-ISPC)

作者： Paethong, Pornpat Sato, Mikiko Namiki, Mitaro Tokyo Univ Agr & Technol Tokyo Japan

ISBN: (纸本)9781509011254

The Internet will become to the Internet of Things (IoT). It provides connectivity for everyone and everything that embeds some intelligence in Internet-connected objects to communicate, exchange information, take decisions, invoke actions and provide amazing services. This will bring a new ubiquitous computing and communication era and change people's lives (drastically/entirely). Moreover, the most important component in IoT is database that used for collecting and storing a lot of data from ubiquitous sensing devices. Even though, cloud-based storage solutions are becoming increasingly popular in recent years, it is inconvenient for residential environments because the sensing devices should be connected to the internet for simultaneously sending data to cloud computing. However, this solution has a high cost implication and high power consumption. Therefore, the credit-card sized computer which is fully functional is a good alternative. It is small and inexpensive computer that provides a new opportunity for IoT hardware. As a result, it is possible to use Raspberry Pi as a database server. In this paper, we will explain how to construct a database server for IoT middleware that has data distribution and low-power consumption by using credit-card size computers which have satisfactory performances and affordable price.

关键词： Credit-card Sized Computer distributed database Embedded System Internet of Things IoT Middleware MongoDB NoSQL database Low-power Raspberry Pi

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The aspects of consistency management of highly-distributed transactional database in a hybrid cloud environment for the energy sector 11

The aspects of consistency management of highly-distributed ...

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11th International Symposium on Telecommunications (BIHTEL)

作者： Dizdarevic, Jasmina Avdagic, Zikrija KJKP Sarajevogas Doo Rajlovacka Bb Sarajevo 71000 Bosnia & Herceg Univ Sarajevo Fac Elect Engn Zmaja Bosne Bb Sarajevo 71000 Bosnia & Herceg

ISBN: (纸本)9781509029020

For many years, there are tendencies to support collaborative work of companies of the energy sector, but only the arrival of cloud computing open the door for the implementation of these ideas and aspirations. This actually means a transition to advanced business model and platform with possibilities for launching energy efficient convergent services. From currently available cloud deployment models, as adequate for the energy sector will be considered a hybrid model, as a very efficient, flexible and comprehensive solution. Immediately after the establishment of a common cloud environment the focus of research redirects to the crucial problem of the organization and management of this complex, highly-distributed environment? Especially regarding transactional cloud database and maintaining its consistency. So far, there have been applied conventional methods for preserving consistency and the other ACID rules in highly-distributed transactional environments. However, the actual goal is to make a step forward and to find the optimal solution for preserving the consistency of the entire cloud DBMS. Therefore, this paper discusses adaptable and dynamic approach to preserving consistency of transactional cloud database called TBC (Tree-Based Consistency) approach. It will be shown that this approach provides optimal results and the expected performance of the entire cloud environment.

关键词： cloud computing hybrid cloud distributed database consistency management TBC approach convergent services energy efficiency and EE measures

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Migration of stored procedure to distributed cloud database

Migration of stored procedure to distributed cloud database

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International Conference on Advances in Materials Science and Information Technologies in Industry (AMSITI)

作者： Duan, Kenan Shanghai Jiao Tong Univ Sch Software Shanghai 200240 Peoples R China

ISBN: (纸本)9783038350125

Many legacy applications rely on a single instance relational database. In the age of big data, applications with growing popularity may continue to generate large amount of data. The data would be beyond the limit of a traditional relational database. These applications can be migrated to a distributed database system for acquiring high scalability and performance. But the migration process is complicated especially for user defined stored procedure. In order to obtain the correct behavior, a stored procedure usually has to be rewritten in the application code. This rewriting is usually a time consuming and unpleasant task. This study gives a mechanism for migrating stored procedure from single instance relational database to distributed sharded database without the need of application code rewriting. In the migration solution offered by this study, Oracle stored procedure code is parsed, analyzed, and translated so as to be stored and executed globally in a sharded database.

关键词： Stored procedure distributed database database migration Sharding

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The implementation of comprehensive system management based on distributed database

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Huazhong Ligong Daxue Xuebao/Journal Huazhong (Central China) University of Science and Technology 2001年第2期29卷 73-75页

作者： Chen, D. Li, Z. College of Management HUST Wuhan 430074 China

A comprehensive system management has been developed to solve the problem of difficulty and low security. By multi-user management, directory and parameter maintaining, data backuping and restoring, this method can control multi-subsystem altogether, so the management becomes simple and safe. A distributed decision support system to show the advantage is demonstrated.

关键词： distributed database Management information system (MIS) System management

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Model and adaptive configuration management strategy for a distributed database server system

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2005年第1期42卷 126-133页

作者： Tian, Junfeng Liu, Yuling Du, Ruizhong Dept. of Comp. Sci. and Technol. Univ. of Sci. and Technol. of China Hefei 230027 China Inst. of Comp. Network Technol. Hebei Univ. Baoding 071002 China

Server redundancy technology solves the problem of availability and the performance bottleneck in the traditional distributed environment, and at the same time presents a new challenge to the system management. A kind of constituting principle and working model of a distributed database server system (DDSS) is presented in this paper. To overcome the weakness of dynamic scalability of redundancy resource in configuration management of the present redundancy server system, aiming at the server DDSS (every service in the system is abstracted to an object class in the model, and multi-instance of the same object class redundantly serving each other is proposed), the configuration management of redundancy resource is discussed, and adaptive configuration management policy based on mobile agent technology is proposed. With the precondition of ensuring the system availability, the system performance is improved and the resource waste is reduced. In ACM, by defining award-penalty function (as for static configuration) and user request arriving rate (as for dynamic configuration) which is the gist of configuration, redundancy instances is added or deleted dynamically. Finally, the algorithmic performance is analyzed and tested, and compared with traditional algorithm.

关键词： Configuration management distributed database Mobile agent Performance analysis Redundancy

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A distributed database system based on database migration and its mechanism for concurrency control

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Systems and Computers in Japan 1999年第5期30卷

作者： Takahiro Hara Kaname Harumoto Masahiko Tsukamoto Shojiro Nishio Department of Information Systems Engineering Graduate School of Engineering Osaka University Suita Japan 565-0871

In this paper, we discuss our proposal of a distributed database system, DB-MAN (distributed database system based on database Migration in ATM Networks), which takes advantage of database migration in virtual local area networks (LANs) of ATM networks. DB-MAN has two notable mechanisms: a mechanism for selecting the transaction processing method and a mechanism for concurrency control with database migration. The former is a mechanism that chooses the more efficient method between two transaction processing methods: the conventional method based on the two-phase commit protocol and our method employing database migration. The latter is a mechanism to prevent the transaction processing throughput from deteriorating in environments where data contention is a significant factor. Then we show simulation results regarding performance comparison between our proposed system and the conventional distributed database system based on the two-phase commit protocol. The obtained results demonstrate that effective use of database migration gives higher performance than that of the conventional system. © 1999 Scripta Technica, Syst Comp Jpn, 30(5): 28–37, 1999

关键词： database migration ATM (asynchronous transfer mode) concurrency control distributed database

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