evolutionary query optimization for heterogeneous distributed database systems

Ngày tải lên: 27/02/2014, 07:20

... 5(i) shows the optimization time for a star query of size 10 for various values of parameter for WAN (similar trends are observed for LAN). We intentionally chose a large query for IDP, since for smaller ... transformation [2], as well as federated query processing and optimization. The query optimization work goes back as far as the early distributed database systems (R*, SDD-1, Distributed In- gres [22, 14, ... estimates. 2.1. The Federated Query Optimization Problem The federated query optimization problem is to find an execution plan for a user-specified query that satisfies an optimization goal provided...

Ngày tải lên: 07/03/2014, 14:20

... management systems such as: Oracle’s Distributed Database Architecture 1-2 Oracle8 Distributed Database Systems Oracle’s Distributed Database Architecture A distributed database is a set of databases ... discusses pure distributed databases. Distributed Database A distributed database is a set of databases stored on multiple computers that appears to applica- tions as a single database. Distributed ... user at the local database. Oracle’s Distributed Database Architecture 1-4 Oracle8 Distributed Database Systems The Network To link the individual databases of a distributed database system,...

Ngày tải lên: 17/01/2014, 09:20

... Versions 1-7 Distributed Databases and Distributed Processing 1-7 Distributed Databases and Database Replication 1-7 Heterogeneous Distributed Databases 1-8 Heterogeneous Services 1-8 Heterogeneous ... < operator > y [AND ] Oracle’s Distributed Database Architecture 1-2 Oracle8 Distributed Database Systems Oracle’s Distributed Database Architecture A distributed database is a set of databases stored on ... database access. Databases and Database Links Each database in a distributed database is distinct from all other databases in the system and has its own global database name. Oracle forms a database s...

Ngày tải lên: 07/03/2014, 23:20

Ngày tải lên: 23/03/2014, 16:20

Ngày tải lên: 30/03/2014, 13:20

... schema architecture, database de- sign, query processing and optimization, transaction management, and distributed database management. Characteristics of Database Systems Systems consisting ... Query optimi- zation for CODASYL database systems. In Pro- ceedings of the ACM SZGMOD Conference, pp. 13&156. DAYAL, U., AND HWANG, H. 1984. View definition and generalization for database ... re- formatting), and exception handling. The commands for the local systems can be embedded in the DOL programs that are forwarded to the local systems and executed under local control. Query...

Ngày tải lên: 20/02/2014, 05:21

... Descriptors C.2.4 [Distributed Systems] : Distributed databases; H.2.4 [Database Management]: Systems concurrency, distributed databases, transaction processing General Terms Algorithms, Design, Performance, ... Section 9. 2. DETERMINISTIC DATABASE SYSTEMS In traditional (System R*-style) distributed database systems, the primary reason that an agreement protocol is needed when commit- ting a distributed transaction ... transaction re- quests for each epoch. Calvin’s current implementation uses Zoo- Keeper, a highly reliable distributed coordination service often used by distributed database systems for heartbeats,...

Ngày tải lên: 07/03/2014, 14:20

Ngày tải lên: 30/03/2014, 13:20

... parametric ODE solver ã Multiple local solutions – a need for global optimization 3 Global Optimization for Parameter Estimation of Dynamic Systems Youdong Lin and Mark A. Stadtherr Department of ... Acknowledgments ã A deterministic global optimization approach based on interval analysis can be used to estimate the parameters of dynamic systems ã A validated solver for parametric ODEs is used to construct ... = Approximate CPU time adjusted for machine used based on SPEC benchmarks ∗ Does not provide rigorous guarantee of global optimality. 17 Validated Solutions for Parametric ODEs (Contd) ã Example...

Ngày tải lên: 12/01/2014, 22:03

... parametric ODE solver ã Multiple local solutions – a need for global optimization 3 Validated Solutions for Parametric ODEs ã Consider the IVP for the parametric ODEs ˙ y = f (y, θ), y(t 0 ) = y 0 , ... 2.6557 ì 10 3 ã Results: 359 iterations and 14.3 CPU seconds 16 Global Optimization for Parameter Estimation of Dynamic Systems Youdong Lin and Mark A. Stadtherr Department of Chemical and Biomolecular ... Acknowledgments ã A deterministic global optimization approach based on interval analysis can be used to estimate the parameters of dynamic systems ã A validated solver for parametric ODEs is used to construct...

Ngày tải lên: 12/01/2014, 22:16

... Semantic Overlay Networks for P2P Sys- tems. Stanford Technical Report 11. Deshpande A, Hellerstein JM, (2002) Decoupled Query Optimization for Fed- erated Database Systems. In Proceedings of ... bases offered by SWIM [8]. 2.4 Query Planning and Execution Query planning in SQPeer is responsible for generating a distributed query plan according to the localization information returned by the ... is performed as in Chord by searching for each value of the query and combining the results at the peer launching the initial query. This approach ignores RDF/S schema information during query...

Ngày tải lên: 19/02/2014, 12:20

... Language for Expert Systems: Comparisons with Database Systems Kathleen R. McKeown Department of Computer Science Columbia University New York, N.Y. 10027 1 Introduction Do natural language database ... the database system. We are currently working on natural language for expert systems at Columbia and thus, expert systems provide a natural alternative environment to compare against the database ... which the user has for how the goal is to be satisfied. Furthermore, the user has the responsibility for determining what information is needed to solve the problem and for producing the final...

Ngày tải lên: 21/02/2014, 20:20

... Pub., San Mateo, CA (1991). [DG92] D. DeWitt and J. Gray. “Parallel Database Systems: The Future of High Performance Database Systems. ” In Communi- cations of the ACM, Vol. 35, No. 6, June 1992. [GL01] ... Dynamic Race Detector for Multi- Threaded Programs.” In Proc. SOSP-16, pp. 27-37, 1997. [Sel88] T. K. Sellis. “Multiple Query Optimization. ” In ACM Transactions on Database Systems, 13(1):23-52, ... broad scope of research in databases, operating systems, and computer architecture. Parallel database systems [DG92][CHM95] exploit the inherent parallelism in a relational query execution plan and...

Ngày tải lên: 07/03/2014, 14:20

Ngày tải lên: 16/03/2014, 16:20

Ngày tải lên: 16/03/2014, 19:20

Ngày tải lên: 23/03/2014, 12:20

Ngày tải lên: 21/06/2014, 03:20

Ngày tải lên: 21/06/2014, 08:20

Ngày tải lên: 22/06/2014, 22:20