query processing and optimization

... complex query processing, simplicity management and resilience to failures In this thesis, we aim to develop effective and efficient solutions to address two challenging issues in epiC: complex query processing ... and the correctness of computation results In this thesis, we mainly focus on two challenging issues in distributed systems: complex query processing and fault tolerance 1.2.2 Complex Query Processing ... On the one hand, efficient algorithms are designed to support both offline data analytics and online query processing On the other hand, various distributed systems are developed to handle various...

Ngày tải lên: 08/09/2015, 15:18

... magnitude in processing costs (see [27] for an example), the key of database query processing is to nd the cheapest and fastest query plan 1.1.1 Conventional Query Processing Conventional query processing ... Contents List of Figures Introduction 1.1 Query Processing in Parallel Database Systems 1.1.1 Conventional Query Processing : : : : : 1.1.2 Parallel Query Processing : : : : : : : : 1.2 An Overview ... example of a deep tree plan and a bushy tree plan for the same four-way join query There are advantages and disadvantages for both deep and bushy tree plans Ap- parently, query optimization becomes...

Ngày tải lên: 28/04/2014, 13:32

... color and node with light color is not valid Pipeline synthesis and optimization methodology and algorithms This section presents methodology and key algorithms for our pipeline synthesis and optimization ... of operators and the ConflictRelation to generate an ASAP (and ALAP) scheduling that gives the earliest (and latest) stage that each operator can be scheduled Tables and show ASAP and ALAP scheduling ... conflict matrix and graph can also be obtained and used for pipeline synthesis and optimization Ab Rahman et al EURASIP Journal on Image and Video Processing 2011, 2011:19 http://jivp.eurasipjournals.com/content/2011/1/19...

Ngày tải lên: 20/06/2014, 22:20

... and B E Stuckman, “Lipschitzian optimization without the Lipschitz constant,” Journal of Optimization Theory and Applications, vol 79, no 1, pp 157–181, 1993 [12] S Bourennane and J Marot, Optimization ... optimization method and GVF, both methods are initialized assuming the a priori knowledge of the center and the radius of the distorted circle The parameters of signal generation and signal processing ... France His research interests are in statistical signal processing, array processing, image processing, multidimensional signal processing, and performances analysis 13 ...

Ngày tải lên: 22/06/2014, 20:20

... centered at s, s1 , e and their radii equal the distances between s and p1 , s1 and p1 (or p2 ), and e and p2 , respectively The only data points that can be closer to se (than p1 and p2 ) must fall ... the query processing cost at the LBS and the network overhead for transferring a large number of candidate results from the LBS to the anonymizer In order to overcome this problem, Gruteser and ... systems, are ranges and nearest neighbors (NN) While the cloaking mechanism at the anonymizer is independent of the query type, query processing at the LBS depends on the query Range queries...

Ngày tải lên: 12/09/2015, 08:19

... 4.4.3 Clip Query Processing 93 vii 4.5 95 4.5.1 Datasets 95 4.5.2 ϕ-match Query Processing 96 4.5.3 Sketch Query Processing ... Section 1.3, we introduce some problems of query processing over complex spatio-temporal sequences Next, we analyze the challenges of efficient and effective query processing of complex spatio-temporal ... contribution, we are the first to identify some query issues and explore query processing 18 techniques of human motion data, based on subsequence matching and subsequence join of human motion sequences...

Ngày tải lên: 14/09/2015, 14:05

... 15 “XML Query VALUE Figure 1.1: An Example XML Data Model 1.2 The XPath Query Language A variety of query languages [1, 2, 3, 4, 5] have been proposed to query XML data All of these query languages ... nodes, which should be returned by query processing, the complexity of their structures that matters in query processing may differ Depending on the actual query load, some type of nodes may be ... u to v} And given two set of data nodes, A and B, we say that B is stable with respect to A if B is a subset of Succ(A) or B and Succ(A) are disjoint If we have two node sets, A and B, and we...

Ngày tải lên: 16/09/2015, 17:11

... are much more diverse and complicated Besides, without a novel method of indexing and query processing mechanism, it works well for a small set of nodes and edges only And the paper mainly focused ... verbose and can be difficult for humans to read and understand compared with our proposed graph model and SNGQL Besides, Since result aggregation and path computation are missed from the standard ... database model for storing and retrieving online social-network-related data Standard data models, query languages and access methods, such as the relational model and SQL, are often inefficient...

Ngày tải lên: 04/10/2015, 10:24

... the query bounds the partition, r1 to r20 would be returned; for case (b) where the query (i.e., the box that bounds r13 and r14 ) is within the partition, we return the values of r13 and r14 and ... constrained range query, certain points can be hidden in a similar way as we handle window queries (e.g., p1 , p5 and p8 ) and range queries (e.g., p2 ) For points like p3 and p7 it becomes more ... of the digests of r3 and r10 respectively Points B1 and B2 are the leftmost and rightmost point of the hyper-sphere query respectively, where B1 x = Pc x − dist(Pc , r9 ) and B2 x = Pc x + dist(Pc...

Ngày tải lên: 13/10/2015, 15:54

... digital signal processing is found in hearing aids and cardiac pacemakers Image Processing Image enhancement, image restoration, image understanding, computer vision, radar and sonar processing, ... processing system 1.5 ANALOG AND DIGITAL SIGNAL PROCESSING The basic elements in digital filters are the multipliers, adders, and delay elements, and they carry out multiplication, addition, and ... Oppenheim and R W Schafer, Discrete-Time Signal Processing, PrenticeHall, 1989 REFERENCES 31 R D Strum and D E Kirk, Discrete Systems and Digital Signal Processing, Addison-Wesley, 1989 S S Soliman and...

Ngày tải lên: 13/09/2012, 10:21

... (1) where mn, µn, and krn are the mobility, viscosity, and relative permeability of the non-wetting phase (CO2) respectively and mw, µw, and krw are the mobility, viscosity, and relative permeability ... plume migration (Zhang and Agarwal, 2012) It is designated as GA-TOUGH2, and has been validated by conducting several benchmark studies [3, 4] In this paper, we consider the optimization of two ... pressure response and its management) In addition, the storage efficiency of an aquifer is also dependent on various injection strategies and parameters associated with them; the optimization of...

Ngày tải lên: 05/09/2013, 16:10

... digital signal processing is found in hearing aids and cardiac pacemakers Image Processing Image enhancement, image restoration, image understanding, computer vision, radar and sonar processing, ... processing system 1.5 ANALOG AND DIGITAL SIGNAL PROCESSING The basic elements in digital filters are the multipliers, adders, and delay elements, and they carry out multiplication, addition, and ... Oppenheim and R W Schafer, Discrete-Time Signal Processing, PrenticeHall, 1989 REFERENCES 31 R D Strum and D E Kirk, Discrete Systems and Digital Signal Processing, Addison-Wesley, 1989 S S Soliman and...

Ngày tải lên: 29/09/2013, 21:20

... too complicated Rapid growth, merger and acquisition, and increased demand for high-bandwidth services led to network-on-top-of-network, creating inefficiency and inflexibility Now, many network ... hands-on understanding of simple to complex network environments PLANNING SERVICES • Program and Project Management • Network and Inventory Audit • Engineering DEPLOYMENT SERVICES • Program and ... approach uncovers and details network architectures, legacy records, processes and databases that have an immediate and direct effect on the success of a carrier’s operations ADC Network and Inventory...

Ngày tải lên: 10/12/2013, 18:15

... for internal and external project-related communication • A true understanding of your business and your requirements, and the proven ability to implement a comprehensive, cohesive and tailored ... management of broadband services and network performance ADC’s comprehensive portfolio of products and services helps our customers increase revenue, lower operational costs, and drive broadband growth ... Installation Services • Commissioning and Integration • Provisioning • Decommissioning and Removals Maintenance Services • Program and Project Management • Service Call Center and Dispatch • Technical Assistance...

Ngày tải lên: 10/12/2013, 18:15

... the curvature of the optimization terrain and should help in finding a better direction for the next step in the iteration than just plain gradient descent 66 GRADIENTS AND OPTIMIZATION METHODS ... mean and covariance matrix w 1 : Apply the stochastic on-line learning rule (3.37), choosing a random initial point and an appropriate learning rate Try different choices for the learning rate and ... rate can and should in fact be time dependent Yet a third very convenient way to write such update rules, in conformity with programming languages, is w w w @ J (w) @ w 64 GRADIENTS AND OPTIMIZATION...

Ngày tải lên: 13/12/2013, 14:15

... Storage and Optimization # Usage-Based Optimization Topic Objective To introduce the concept of usage-based optimization ! Working with the Usage-Based Optimization Wizard Lead-in ! Using the Query ... Storage and Optimization 35 Lab B: Implementing Usage-Based Optimization Topic Objective To perform usage-based optimization Lead-in In this lab, you will design and optimize storage and create ... values are calculated at query time This causes the query to be slow ! The query results are automatically cached on the server and on the client cache ! User B submits the same query Because the results...

Ngày tải lên: 18/01/2014, 05:20

... Cluster Query Processing Model 9.5.1 9.5.2 9.5.3 9.6 270 Overview of Dynamic Query Processing A Cluster Query Processing Architecture Load Information Exchange 273 Dynamic Cluster Query Optimization ... Parallel Databases and Grid Databases Parallel Query Processing: Motivations Parallel Query Processing: Objectives 1.3.1 1.3.2 1.3.3 1.4 10 12 Interquery Parallelism 13 Intraquery Parallelism ... advanced query operations This part covers groupby-join operations, parallel indexing, parallel object-oriented query processing, in particular, collection join, and query scheduling and optimization...

Ngày tải lên: 21/01/2014, 18:20

... important factor in parallel database query processing Therefore, understanding skew modeling is a critical part of understanding parallel database query processing In Section 2.4, basic cost ... for parallel database processing can be found in Hameurlain and Morvan (DEXA 1995), Graefe and Cole (ACM TODS 1995), Shatdal and Naughton (SIGMOD 1995), and Ganguly, Goel, and Silberschatz (PODS ... 500/ D 0:00001 Projectivity and selectivity ratios are important parameters in query processing, as they are associated with the number of records before and after processing; additionally, the...

Ngày tải lên: 21/01/2014, 18:20

... through the join query An example of a non-PK-FK equi-join query is “retrieve pairs of lecturers and courses from the same department” The query joins table Lecturer and table Course, and the join ... this type of join query is called an equi-join query Figure 5.1 gives an illustration of a join query between two tables, table R and table S, based on attribute attr2 of table R and attribute attr1 ... group-by attribute and performs the aggregate function Using Query 4.5 as an example, one node may produce, for example, (Math, 300) and (Science, 500) and another node (Business, 100) and (Science,...

Ngày tải lên: 21/01/2014, 18:20