Query Plans with Roaming Sources: Shifting Streams of Data
نویسندگان
چکیده
Wireless embedded systems provide an opportunity for the collection of useful data from a wide range of mobile devices. However, such devices may often have strict limits on their functionality, processing power, battery life, and wireless bandwidth. We present a method for distributing mobile query operators to enhance performance in a system consisting of many such mobile devices while supporting their mobility. As the devices roam throughout the area, the system shifts query data streams to follow the mobile data sources. We then provide an analysis of such a query distribution scheme in terms of expected bandwidth usage within the system.
منابع مشابه
Semantic Query Optimization for Query Plans of Heterogeneous Multidatabase Systems
New applications of information systems, such as electronic commerce and healthcare information systems, need to integrate a large number of heterogeneous databases over computer networks. Answering a query in these applications usually involves selecting relevant information sources and generating a query plan to combine the data automatically. As signi cant progress has been made in source se...
متن کاملOptimizing Multiple Queries against XML Streams
Processing and querying streams, XML streams in particular, has recently become a widely recognized area of interest both in research and in industry. In contrast to traditional query evaluation for databases, where multiple queries against the same data can be evaluated sequentially, for a streamed environment only the simultaneous execution of multiple queries is feasible, as the sequential e...
متن کاملFree roaming dogs: a threat to public health
Free roaming dogs are increasing in numbers. They live in unhygienic conditions and are not vaccinated mostly. They create several problems in the community, particularly health threats to human. Dog biting is a commonly reported case in some hospitals in Bangladesh. Rabies is one of the killers of people in Bangladesh and transmission occurs mostly due the dog biting. Death commonly occurs in ...
متن کاملTransformation of Continuous Aggregation Join Queries over Data Streams
We address continuously processing an aggregation join query over data streams. Queries of this type involve both join and aggregation operations, with windows specified on join input streams. To our knowledge, the existing researches address join query optimization and aggregation query optimization as separate problems. Our observation, however, is that by putting them within the same scope o...
متن کاملRecursive Query Plans for Data
Generating query-answering plans for data integration systems requires to translate a user query, formulated in terms of a mediated schema, to a query that uses relations that are actually stored in data sources. Previous solutions to the translation problem produced sets of conjunctive plans, and were therefore limited in their ability to handle recursive queries and to exploit data sources wi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003