Aqua: A Fast Decision Support Systems Using Approximate Query Answers
نویسندگان
چکیده
Aqua is a system for providing fast, approximate answers to aggregate queries, which are very common in OLAP applications. It has been designed to run on top of any commercial relational DBMS. Aqua precomputes synopses (special statistical summaries) of the original data and stores them in the DBMS. It provides approximate answers (with quality guarantees) by rewriting the queries to run on these synopses. Finally, Aqua also incrementally keeps the synopses up-to-date as the database changes.
منابع مشابه
Aqua: A Fast Decision Support System Using Approximate Query Answers
Aqua is a system for providing fast, approximate answers to aggregate queries, which are very common in OLAP applications. It has been designed to run on top of any commercial relational DBMS. Aqua precomputes synopses (special statistical summaries) of the original data and stores them in the DBMS. It provides approximate answers (with quality guarantees) by rewriting the queries to run on the...
متن کاملAqua Project White Paper
In large data recording and warehousing environments it is often advantageous to provide fast approximate answers to queries whenever possible The goal is to provide an estimated response in orders of magnitude less time than the time to compute an exact answer by avoiding or minimizing the number of accesses to the base data This white paper describes the Approximate QUery Answering AQUA Proje...
متن کاملProviding Approximate Answers Using a Knowledge Abstraction Database
As database users adopt a query language to obtain information from a database, a more intelligent query answering system is increasingly needed. Relational databases are exact in nature, but effectiveness of decision support would improve significantly if the query answering system returns approximate answers rather than a null information response when there is no matching data available. Thi...
متن کاملSampling Methods in Approximate Query Answering Systems
INTRODUCTION In recent years, advances in data collection and management technologies have led to a proliferation of very large databases. These large data repositories are typically created in the hope that through analysis, such as data mining and decision support, they will yield new insights into the data and the real-world processes that created it. In practice, however, while the collecti...
متن کاملCooperative Query Processing via Knowledge Abstraction and Query Relaxation
As database users adopt a query language to obtain information from a database, a more intelligent query answering system is increasingly needed that cooperates with the users to provide informative responses by understanding the intent behind a query. The effectiveness of decision support would improve significantly if the query answering system returned approximate answers rather than a null ...
متن کامل