Synonyms Query evaluation ; Query planning and execution Definition In an (object) relational database management system (DBMS) query processing comprises all steps of processing a user submitted query including its execution to compute the requested result. Usually, a user query – for example a ...
A multidatabase system (MDBS) integrates information from autonomous local databases managed by heterogeneous database management systems (DBMS) in a distributed environment. For a query involving more than one database, global query optimization should be performed to achieve good overall system perform...
如何处理pipeline processing,如果当开启re-optimization时已经有部分答案已经return给用户了。 SIGMOD 2004“Robust Query Processing through Progressive Optimization”就是聚焦于以上两点问题。对于我来说,第二点的solutions是major contribution。今天主要讨论第二点。 我们首先明确作者提出的两个定义: materialization point:...
Active Integration of Databases in Grids for Scalable Distributed Query Processing Summary: A focus of Grid computing are data intensive applications. Additionally, database management systems (DBMS) are gaining on importance in many scientific disciplines for publication of research results. The employment...
which may themselves be DBMSs, Web sites, or applications. This requires two main stages that ofquery reformulationwhere the user’s query is composed with schema mappings to produce a combined (distributed) query andquery optimization and executionwhere the query is executed efficiently across the...
Based on this prototype, we provide an experimental validation of multistore query processing in a cluster to evaluate the impact on performance of optimization. More specifically, we explore the performance benefit of using bind join and select pushdown under different conditions. Overall, our ...
In this work access support relations are introduced as a means for optimizing query processing in object-oriented database systems. The general idea is t... A Kemper,G Moerkotte - 《Information Systems》 被引量: 141发表: 1992年 Semantic Query Optimization for Methods in Object-Oriented Databa...
There is also room for optimization in RDF processing to reduce the gap between RDF and relational data processing. SPARQL is a popular RDF query language; however current engines do not fully benefit from parallelization potential. We ... F Zavoral - 《International Journal on Advances in Inte...
By selecting the optimal execution plan for processing data, Query Optimization significantly improves database performance and minimizes latency. FAQs What is Query Optimization?Query Optimization is an aspect of DBMS that determines the most efficient way to execute a given query. ...
System, method, computer program product embodiments and combinations and sub-combinations thereof for tuning query execution performance in a database management system are described. In an aspect, query optimization in a database management system (DBMS) with memory I/O (input/output) awareness inc...