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Dynamic Query Optimization and Query Processing in Multidatabase Systems

Henryk Josinski
2000 International Conference on Extending Database Technology  
Practical verification of the suggested solutions will take place after their implementation in the EDDBMS.  ...  Global query processing techniques are also intended to be tested in various distributed computing environments.  ...  Introduction The multidatabase system (MDBS) approach, as a solution for integrated access to information distributed among diverse data sources, has gained a lot of attention in recent years.  ... 
dblp:conf/edbt/Josinski00 fatcat:2biuzars3rdqfibhlwccgfv5su

Segmenting and Labeling Query Sequences in a Multidatabase Environment [chapter]

Aybar C. Acar, Amihai Motro
2011 Lecture Notes in Computer Science  
Furthermore, when gathering information, there is a fair bit of trial and error involved, where queries are recursively refined according to the results of a previous query in the sequence.  ...  The problem has two sub-problems: segmenting the sequence into subsequences, each representing a discrete goal; and labeling each query in these subsequences according to how they contribute to the goal  ...  Section 3 defines the exact problem, discusses relevant issues and the information available in the solution of the problem.  ... 
doi:10.1007/978-3-642-25109-2_24 fatcat:dgnc766r2re5pkotwxwiqpty7y

Inferring User Goals from Sets of Independent Queries in a Multidatabase Environment [chapter]

Aybar C. Acar, Amihai Motro
2010 Studies in Computational Intelligence  
We propose a structure and the associated methods which may enable this structure to combine a number of seemingly independent queries into a single, meaningful global query which represents the reason  ...  for these component queries.  ...  Background The work presented in this chapter draws from a diverse range of subjects, including information integrating systems (multidatabase systems) and query decomposition, join inference, and association  ... 
doi:10.1007/978-3-642-05183-8_9 fatcat:vbri2b4bfvaxbeahpzntlh2zra

Evolutionary techniques for updating query cost models in a dynamic multidatabase environment

Amira Rahal, Qiang Zhu, Per-�ke Larson
2004 The VLDB journal  
Deriving local cost models for query optimization in a dynamic multidatabase system (MDBS) is a challenging issue.  ...  The relevant issues, including derivation of recurrence updating formulas, development of efficient algorithms, analysis and comparison of complexities, and design of an integrated scheme to apply the  ...  The preliminary version of this paper appeared in [14] , which did not cover some discussions including the derivation of the block-moving method and its performance analysis and comparison with others  ... 
doi:10.1007/s00778-003-0110-4 fatcat:7nirmyrrl5bs7mz74mhfbdrhni

Deploying and managing Web services: issues, solutions, and directions

Qi Yu, Xumin Liu, Athman Bouguettaya, Brahim Medjahed
2006 The VLDB journal  
This survey focuses on investigating the different research problems, solutions, and directions to deploying Web services that are managed by an integrated Web Service Management System (WSMS).  ...  The survey identifies the key features of a WSMS and conducts a comparative study on how current research approaches and projects fit in.  ...  Optimization techniques have been widely adopted in different types of DBMS (e.g., central, distributed, and multidatabases) for optimizing data queries.  ... 
doi:10.1007/s00778-006-0020-3 fatcat:65vvegtlljaohmkwnzrrp7zk6i

Global Query Optimization Based on Multistate Cost Models for a Dynamic Multidatabase System [chapter]

Qiang Zhu, Jaidev Haridas, Wen-Chi Hou
Enterprise Information Systems V  
Global query optimization in a multidatabase system (MDBS) is a challenging issue since some local optimization information such as local cost models may not be available at the global level due to local  ...  Experiments demonstrate that the proposed technique is quite promising for performing global query optimization in a dynamic MDBS.  ...  Other multidatabase query optimization issues that have been studied in the literature include: join tree parallelism (Du, 1995; Evrendilek, 1997; Subramanian, 1998) , entity joins (Tsai, 1997) , outerjoins  ... 
doi:10.1007/1-4020-2673-0_14 fatcat:nki6oz2tp5ci3bygt2gq5fe2h4

Query Processing and Optimization on the Web

Mourad Ouzzani, Athman Bouguettaya
2004 Distributed and parallel databases  
They add new dimensions to the optimization problem such as the choice of objective function, selection of relevant information sources, limited query capabilities, and unpredictable events.  ...  We also outline a classification for optimization techniques and a framework for evaluating them.  ...  The authors would like to thank the anonymous reviewers and Brahim Medjahed for their valuable comments on earlier drafts of this paper.  ... 
doi:10.1023/b:dapd.0000018574.71588.06 fatcat:qmdqsvtmhzhbpk5atffbwa2msu

An Adaptive Probe-Based Technique to Optimize Join Queries in Distributed Internet Databases

Latifur Khan, Dennis McLeod, Cyrus Shahabi
2001 Journal of Database Management  
expensive query plan using a static query optimizer.  ...  An implementation of our run-time optimization technique for join queries was constructed in the Java language and incorporated into an experimental setup.  ...  on the query processing and optimization issues(see Sec. 5).  ... 
doi:10.4018/jdm.2001100101 fatcat:627jlz7f6zhinap6p4pyek7vcq

Interoperability In Multidatabases: Semantic and System Issues (Panel)

Yuri Breitbart, Hector Garcia-Molina, Witold Litwin, Nick Roussopoulos, Hans-Jörg Schek, Gio Wiederhold
1991 Very Large Data Bases Conference  
The query optimization requires solving such issues as reducing large data quantities collected at local sites using either known data semantics to obtain summary data or reducing inter-site communication  ...  Descriptive modeling of asynchronous data processing would require a solution of such issues as devising simulation models for a heterogeneous distributed database environment.  ... 
dblp:conf/vldb/BreitbartGLRSW91 fatcat:evsnbg4duzendotwyzl24y2bvm

Assessment and Optimization of User Imprecise Queries in Cloud Environments

Pichaimuthu Mohankumar, Balusamy Balamurugan
2017 International Journal of Intelligent Engineering and Systems  
To address optimization issues in this paper, we proposed the techniques for optimizing the queries to provide customers with fast data retrieval.  ...  This paper provides a vision to tackle these issues by assessing the imprecise incoming query and reutilizing for future user instead of rejecting as wrong or irrelevant.  ...  In this section we discuss briefly issues and solutions that concern imperfections in the definition of transformations (e.g., queries), in the definition of modifications (e.g., updates or restructuring  ... 
doi:10.22266/ijies2017.0630.14 fatcat:hp3z7uso7vbchafsj4ceejg3xi

Database System Architecture – A Walk Through Time: From Centralized Platform to Mobile Computing – Keynote Address [chapter]

Ali R. Hurson, Yu Jiao
2005 Lecture Notes in Computer Science  
It also extensively discusses Heterogeneous Distributed Database Systems (HDDBS) and Mobile Data Access Systems (MDAS). Finally, it will address several research issues and their potential solutions.  ...  Heterogeneous distributed databases are designed to deal with issue of data integration and interoperability.  ...  inter-database dependencies and relationships Query processing and Query Optimization Query decomposition and optimization in face of the component databases which could be unavailable, unwilling  ... 
doi:10.1007/11533962_1 fatcat:e36tkeizefbwbexyoqta7frf3i

The CORDS multidatabase project

G. K. Attaluri, D. P. Bradshaw, N. Coburn, P. A. Larson, P. Martin, A. Silberschatz, J. Slonim, Q. Zhu
1995 IBM Systems Journal  
This paper provides an overview of the system architecture and describes the approaches taken in the following areas: management of catalog information, schema integration, global query optimization, (  ...  As part of this project, we are designing and prototyping a multidatabase system.  ...  Paulley (query optimization, IMS agent, ORACLE agent), Wendy Powley (prototype implementation), Zhanpeng Wang (schema integration), Weipeng Yan (user interface and query optimization), and Jianchun Zhang  ... 
doi:10.1147/sj.341.0039 fatcat:qwbj6vx4zfbt5ogd2hdxzngt3m

Efficiently Updating Cost Repository Values for Query Optimization on Web Data Sources in a Mediator/Wrapper Environment [chapter]

Justo Hidalgo, Alberto Pan, Manuel Álvarez, Jaime Guerrero
2006 Lecture Notes in Computer Science  
Optimizing accesses to sources in a mediator/wrapper environment is a critical need.  ...  executions, and generates a new model instance in each new iteration with an efficient processing cost.  ...  Other issues must be taken into account in mediator optimization such as physical optimization, as described in previous works [5] [6] [9] [11] [16] .  ... 
doi:10.1007/11780991_1 fatcat:k5ua27dnpnfipioxppge65y45a

Query processing in multistore systems: an overview

Carlyna Bondiombouy, Patrick Valduriez
2016 International Journal of Cloud Computing  
In this paper, we give an overview of query processing in multistore systems. We start by introducing the recent cloud data management solutions and query processing in multidatabase systems.  ...  Section 5 concludes and discusses open issues.  ...  Heterogeneous Query Optimization In addition to heterogeneous cost modeling, multidatabase query optimization must deal with the issue of the heterogeneous computing capabilities of data sources.  ... 
doi:10.1504/ijcc.2016.10001884 fatcat:jpuixv6mxzhmdkuqrmqbgbbl24

Query processing in multistore systems: an overview

Carlyna Bondiombouy, Patrick Valduriez
2016 International Journal of Cloud Computing  
In this paper, we give an overview of query processing in multistore systems. We start by introducing the recent cloud data management solutions and query processing in multidatabase systems.  ...  Section 5 concludes and discusses open issues.  ...  Heterogeneous Query Optimization In addition to heterogeneous cost modeling, multidatabase query optimization must deal with the issue of the heterogeneous computing capabilities of data sources.  ... 
doi:10.1504/ijcc.2016.080903 fatcat:etteedwysbcyfidbaeh7x2lrne
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