Flexible Aggregate Similarity Search, ABSTRACT Aggregate similarity search, aka aggregate nearest neigh-bor (Ann) query, ﬁnds many useful applications in spatial , Systems Subject: Query processing General Terms Algorithms 1 INTRODUCTION , ie, it is the aggregate distance between p and all points in S aggregated by g The ﬂexible aggregate similarity searchContainment of aggregate queries, ACM SIGMOD Record | 10 ,, Mar 01, 2005· Abstract Containment of Aggregate Queries* Sara Cohen Faculty of Industrial Engineering and Management Technion-Israel Institute of Technology Haifa 32000, Israel [email protected] cient conditions for cquivalcnce, and complete algorithms wcre presented in thcse papers only for very rcI t is now common for databascs t o contain many gi- strictcd casOptimizing Aggregate Query Processing in Cloud Data ,, Sep 02, 2014· Existing aggregate query processing algorithms focus on optimizing various query operations but give less importance to communication cost overhead (Two-phase algorithm) However, in cloud architectures, the communication cost overhead is an important factor in query processingCSDL | IEEE Computer Society, P,RELIMINARIES,This paper focuses on the problem of aggregate query,processing across multiple databases in the presence of,probabilistic schema mappings The system may contain a number of,data sources and a mediated schema, as in Scalable Distributed Aggregate Computations Through ,, Aug 22, 2005· Abstract Computing aggregates over distributed data sets constitutes an interesting class of distributed queri Recent advances in peer-to-peer discovery of data sources and query processing techniques have made such queries feasible and potentially more frequent.
abstract for aggregate query processing in peer to p, A Database Query Processing Model in Peer-To- Peer, A Database Query Processing Model in Peer-To-Peer Network , Abstract Peer- to-peer databases are becoming more prevalent on the internet for , ad hoc analysis queries, aggregation queries, on these databases poses unique challeng , model in peer-to-peer networks using top-k query processing technique and ,Aggregate, Aggregate-Query Processing in Data Warehousing Environments* Ashish Gupta Venky Harinarayan Dallan Quass IBM Almaden Research Center Abstract In this paper we introduce generalized pro- jections (GPs), an extension of duplicate- eliminating projections, that capture aggre- gations, groupbys, duplicate-eliminating pro-Improving Search in Peer, network, nodes spend processing resources (ie, cycles) to forward the query, process it, etc, and bandwidth to send and receive messag The main cost of queries are there-fore bandwidth and processing Since the cost of a query is not incurred at any single node in the network, it makes sense to discuss costs in aggregate (ie, overall the ,Of Nests and Trees: A Unified Approach to Processing ,, Of Nests aud Trees: A Untied Approach to Processing Queries That Contain Nested Subqueries, Aggregates, and Quantifiers Umeshwar Dayal Computer Corporation of America 4 Cambridge Center Cambridge, Massachusetts 02142-1489 Abstract Existing query optimizers focus on Restrict-Project-Join queriProgressive approximate aggregate queries with a multi ,, Answering aggregate queries like SUM, COUNT, MIN, MAX, AVG in an approximate manner is often desirable when the exact answer is not needed or too costly to compute We present an algorithm for answering such queries in multi-dimensional databases, using selective traversal of a Multi-Resolution Aggregate (MRA) tree structure storing point data.
Approximately processing aggregate range queries on remote ,, Jan 01, 2013· Abstract Processing aggregate range queries on remote spatial databases suffers from accessing huge and/or large number of databases that operate autonomously and simple and/or restrictive web API interfac To overcome these difficulties, this paper applies a revised version of regular polygon-based search algorithm (RPSA) to approximately ,What Can Databases Do for Peer, Peer-to-Peer Design Choices Affecting Data Placement While the globally optimal peer-to-peer concept is conceptually simple to deﬁne for an ideal environment, in practice any P2P system will have certain limitations These compromisesare due to factors such as constrainedbandwidthand resources, message propagationdelays, and so onScalable Distributed Aggregate Computations through ,, Abstract Computing aggregates over distributed data sets constitutes an interesting class of distributed queri Recent advances in peer-to-peer discovery of data sources and query processing techniques have made such queries feasible and potentially more frequent The concurrent execution ofOn Efficient Aggregate Nearest Neighbor Query Processing ,, An aggregate nearest neighbor (ANN) query returns a point of interest (POI) that minimizes an aggregate function for multiple query points In this paper, we propose an efficient approach to tackle ANN queries in road networks Our approach consists of ,Aggregate Queries in Peer, Aggregate Queries in Peer-to-Peer OLAP Mauricio Minuto Espil Pontiﬁcia Universidad Catolica Argentina [email protected] Alejandro A Vaisman Universidad de Buenos Aires [email protected] ABSTRACT A peer-to-peer (P2P) data management system consists es-sentially of a network of peer systems, each maintaining full autonomy over its own data ,.
aggregate query environments, Aggregate-Query Processing in Data Warehousing Environments 2006-07-29 Aggregate-Query Processing in Data Warehousing Environments* Ashish Gupta Venky Harinarayan Dallan Quass IBM Almaden Research Center Abstract In this we introduce generalized pro- jections (GPs), an extension of duplicate- eliminating projections, that capture aggre-(PDF) Aggregate queries in peer, First, we add a query processing layer to perform innetwork data aggregation over peer cach Second, we introduce the concept of Query-Trails: a cache listing recent data requestorsFixed, In this paper, we propose an efficient sample-based approach to answer fixed-precision approximate continuous aggregate queries in peer-to-peer databasQuerying the Internet with PIER, database query processing with recent peer-to-peer network-ing technologies, and we provide a detailed performance study demonstrating the need for and feasibility of our de-sign Finally, we describe how our architecture and tradeoffs raise a number of new research questions, both architectural and algorithmic, that are ripe for further ,Deciding equivalences among conjunctive aggregate queries ,, Apr 01, 2007· Equivalence of aggregate queries is investigated for the class of conjunctive queries with comparisons and the aggregate operators count, count-distinct, min, max, and sum Essentially, this class contains unnested SQL queries with the above aggregate operators, with a where clause consisting of a conjunction of comparisons, and without a ,.
Processing Complex Aggregate Queries over Data Streams, sults to user queries while looking at the relevant data items only once and in a ﬁxed order (determined by the stream-arrival pattern) Two key parameters for query processing over continuous data-streams are (1) the amount of memory made available to the on-line algorithm, and (2) the per-item processing timerequired by the query processorManaging Multidimensional Historical Aggregate Data in ,, A P2P-based framework supporting the extraction of aggregates from historical multidimensional data is proposed, which provides efficient and robust query evaluation When a data population is published, data are summarized in a synopsis, consisting of an index built on top of a set of subsynopses (storing compressed representations of distinct data portions)Privacy Preserving OLAP, ABSTRACT We present techniques for privacy-preserving computationof mul- , On-line analytical processing (OLAP) is a key technology em-ployed in business-intelligence systems The computationof multi- , represent the above aggregate queryAnalysis of Search and Replication in Unstructured Peer ,, Analysis of Search and Replication in Unstructured Peer-to-Peer Networks Saurabh Tewari, Leonard Kleinrock , ABSTRACT This paper investigates the effect of the number of file replicas on search performance in unstructured peer-to-peer networks We observe that for a search network with a random graph topology , The query-processing load for ,RPK, Jan 01, 2016· Join-aggregate query which returns aggregate information on the join of several tables is widely used in big data analysis For instance, many TPC-H 1 queries contain joinaggregate operation for performance evaluation However, it is time-consuming to run join-aggregate query in existing systems like Hive and Pig.
Abstract, Abstract The requirements of wide-area distributed database systems differ dramatically from , The goal of the query processing system is to solve the query within the allotted budget by contracting with various Mariposa processing sites to perform por- , be solvable, either because nobody will bid on them or because the aggregate of the ,Johannes Gehrke Processing Aggregate Queries over ,, PROCESSING AGGREGATE QUERIES OVER CONTINUOUS DATA STREAMS 250 Johannes Gehrke Processing Aggregate Queries over Continuous Data Streams Abstract of Presentation Transcript of Presentation BIOSKETCH: Johannes Gehrke is an assistant professor in the Department of Computer Science at Cornell UniversityNSF Award Search: Award#0916488, ABSTRACT When dealing with massive quantities of data, ranking and aggregate queries are powerful techniques for focusing attention on the most important answers Many applications that produce such massive quantities of data inherently introduce uncertainty in the same time, for example, probabilistic match in data integration, imprecise measurements from sensors, fuzzy duplicates in data ,