Decoupled Query Optimization for Federated Database Systems docx

... in a multidatabase system. In ICDE, 1994. Decoupled Query Optimization for Federated Database Systems Amol Deshpande Joseph M. Hellerstein Computer Science Division University of California, Berkeley amol, ... of size 3 makes it choose the Query 5 Query 7 Query 8 Query 9 Queries 0 1 2 Average Scaled Cost (i) 2PO IDP(4) IDP(3) IDP-M(4,5) IDP-M(3,5) Query 5 Query 7 Qu...

Ngày tải lên: 07/03/2014, 14:20

... compression-aware que- ry optimization is crucial for query performance – usage of our compression methods and optimization algorithms achieves up to an order improvement in query performance over existing ... heuristics for choosing query plans suing decom- pression and the use of compression-aware optimization is significant. This section starts with a formal introduction of...

Ngày tải lên: 30/03/2014, 13:20

... Distributed query support. “Sharding” an RDBMS can reduce, or eliminate in certain cases, the ability to perform complex data queries. NoSQL database systems retain their full query expressive ... technology is a forced t for modern interactive software systems. Because vendors of RDBMS technology have little incentive to disrupt a technology generating billions of dollars f...

Ngày tải lên: 19/02/2014, 12:20

... two query language interfaces, SQL and ARIEL, and a version of DDTS that supported SQL and GORDAS (a query language for an extended ER model). Federated Database Systems 201 Future systems ... administrator, database design and integration, distributed DBMS, federated database system, heterogeneous DBMS, multidatabase language, negotiation, operation transformation,...

Ngày tải lên: 20/02/2014, 05:21

... [Distributed Systems] : Distributed databases; H.2.4 [Database Management]: Systems concurrency, distributed databases, transaction processing General Terms Algorithms, Design, Performance, Reliability Keywords determinism, ... a problem in deterministic database systems; si nce the state of a database can be completely determined from the input to the database, logical log- ging is...

Ngày tải lên: 07/03/2014, 14:20

... 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...

Ngày tải lên: 07/03/2014, 14:20

... orientation in database systems, which is applied to characterize the engineering database systems investigated in the remainder of this section. 3.1 The (Pure) Relational Database Systems In ... representation. For simplicity we show the respective query for each attribute of type QUEL. In an actual implementation the column would probably store the query in a preproc...

Ngày tải lên: 07/03/2014, 23:20

Ngày tải lên: 27/02/2014, 07:20

Ngày tải lên: 14/12/2013, 16:15

... possible. Two arrays of integers, one for hours and one for minutes, seemed best. Array element 0 is a good choice for the current time, and 1–3 for the daily cycle start times. For text representation of ... options. For more information about tools, see Section 3.7, Development Tools for a Microcontroller. 9.1— Optimization Anyone interested in the art and science of compi...

Ngày tải lên: 22/12/2013, 02:17