Database query optimization

Query Optimization in Database Grid

DarGridII is an implemented database gird system whose goal is to provide a semantic solution for integrating database resources on the web. Although many algorithms have been proposed for optimizing query-processing in order to minimize costs and/or response time, associated with obtaining the answer to query in a distributed database system, database grid query optimization problem is fundame...

Testing relational database query optimization strategies

Query optimization is one of the most important problems in databases. Query optimization can be talked about in different scenarios with different tools and different results. In this paper we’ll talk about query processing and optimization and test strategies in different context, starting from simple queries continuing with correlated queries, joins with or without different indexing strateg...

Decoupled Query Optimization for Federated Database Systems

We study the problem of query optimization in federated database systems. The nature of federated databases explicitly decouples many aspects of the optimization process, often making it imperative for the optimizer to consult underlying data sources while doing cost-based optimization. This not only increases the cost of optimization, but also changes the trade-offs involved in the optimizatio...

Algebraic query optimization in database systems

Query Optimization Concepts in Distributed Database

Query optimization is an important part of database management system. In this paper, through the research on query optimization technology, based on a number of optimization algorithms commonly used in distributed query, It aims to arrive at an optimal query processing plan for a given distributed query. As per the approach, the query plans having the required data residing close to each other...