Query Optimization In Compressed Database Systems pdf
... join in the future and study its im- pact on our techniques. Queries: We are interested in queries (particularly joins) involving compressed string-valued attributes. Although que- ries involving ... for Plan 3), since the intermediate results of Plan 5 fit into the buffer pool. Plan 5 illustrates a central point: Query optimiza- tion in compressed database systems needs to comb...
Ngày tải lên: 30/03/2014, 13:20
... between any two sites involved in the query. No Pipelining Across Sites : We assume that there is no pipelining of data among query operators across sites. The main issue with pipelining across sites ... Join processing in database systems with large main memories. TODS, 1986. [44] A. Sheth and J. Larson. Federated database systems for man- aging distributed, heterogeneous, an...
Ngày tải lên: 07/03/2014, 14:20
... immense interest in the engineering field in the last two decades. Optimization methods are of great importance in practice, particularly in engineering design, scientific experiments, and business decision ... both planning and operating engi neers. Linear pro- gramming has extensions in the simplex method, revised simplex method, and interior point techniques. 4 1 Introduction Int...
Ngày tải lên: 30/03/2014, 07:20
Expressing and Optimizing Sequence Queries in Database Systems pdf
... determines how far the pattern should be advanced in the input, and ACM Transactions on Database Systems, Vol. 29, No. 2, June 2004. Expressing and Optimizing Sequence Queries in Database Systems • 295 —next( ... zero. ACM Transactions on Database Systems, Vol. 29, No. 2, June 2004. Expressing and Optimizing Sequence Queries in Database Systems REZA SADRI Procom Technology...
Ngày tải lên: 30/03/2014, 22:20
Inclusion of new types in relational database systems
... White Plains, N.Y., June 1980. [KOOI82] Kooi, R. and Frankfurth, D., " ;Query Optimization in INGRES," IEEE Database Engineering, September 1982. [LITW80] Litwin, W., "Linear Hashing: ... described in [ONG84]. Our initial experience with the system is that dynamic linking is not preferable to static linking. One problem is that initial loading of routines is slow. Also,...
Ngày tải lên: 22/10/2013, 10:15
Báo cáo khoa học: "Combining Acoustic and Pragmatic Features to Predict Recognition Performance in Spoken Dialogue Systems" pdf
... the remaining data into an 80% training and 20% test set. 3. Run TiMBL with all possible parameter set- tings on the generated training and test sets and store the best performing settings. 4. ... feature indicating the number of indefinite NPs that can be uniquely resolved in the Information State (#uniqueIndefinites, e.g. “a tower” where there is only one tower in the do- main). We includ...
Ngày tải lên: 08/03/2014, 04:22
Báo cáo khoa học: "Flexible Guidance Generation using User Model in Spoken Dialogue Systems" pdf
... dialogue systems is database retrieval. Some IVR (interactive voice response) systems us- ing the speech recognition technology are being put into practical use as its simplest form. According to the ... omitted. Contents of Responses Information that should be included in the sys- tem response can be classified into the following two items. 1. Dialogue management information 2. Domain...
Ngày tải lên: 31/03/2014, 03:20
Tài liệu Query Processing in RDF/S-based P2P Database Systems ppt
... value of the query and combining the results at the peer launching the initial query. This approach ignores RDF/S schema information during query routing, while distributed query planning and execution ... Distributed Queries and Query Optimization in Schema-Based P2P -Systems. In Proceed- ings of the International Workshop on Databases, Information Systems and Peer-to-Peer C...
Ngày tải lên: 19/02/2014, 12:20
Tài liệu a query sublanguage for temporal clinical database systems and its implementation. pdf
Ngày tải lên: 27/02/2014, 07:20
Query Execution in Column-Oriented Database Systems ppt
... a query; • Using index-only plans; by creating a collection of indices that cover all of the columns used in a query, it is possible for the database system to answer a query without ever going ... low, which improves query performance. Finally, we introduce a new join technique, the “invisible join”, that converts a join into a set of faster predicate applications on individual co...
Ngày tải lên: 23/03/2014, 16:20