Concise Query Processing in Uncertain Database
نویسندگان
چکیده
منابع مشابه
Concise Query Processing in Uncertain Database
Wireless communication technology has been rapidly increasing, it became quite common for people to view maps or get related services from the handheld devices, such as mobile phones and PDAs. Spatial databases have witnessed an increasing number of applications recently, due to the fast advance in the fields of mobile computing and embedded systems and the spread of the Internet . Range querie...
متن کاملQuery Processing over Uncertain Data
An uncertain or probabilistic database is defined as a probability distribution over a set of deterministic database instances called possible worlds. In the classical deterministic setting, the query processing problem is to compute the set of tuples representing the answer of a given query on a given database. In the probabilistic setting, this problem becomes the computation of all pairs (t,...
متن کاملEfficient Query Processing Techniques in Uncertain Databases
Query processing on uncertain data has become increasingly important in many real-world applications. In this paper, we present our works on formulating and tackling three important queries in uncertain databases, that is, probabilistic group nearest neighbor (PGNN), probabilistic reverse skyline (PRSQ), and probabilistic reverse nearest neighbor (PRNN) queries.
متن کاملQuery Selectivity Estimation for Uncertain Database
Applications requiring the handling of urzcertain data have led to the developmerlt of database management systerns extending the scope of relational databases to include uncertain (probabilistic) data as a izative data type. New automatic query optirnizatiorzs having the ability to estimate the cost of execution of a given query plan, as available in existing databases, need to be developed. F...
متن کاملAdvance Database Aggregation Query Processing
The aggregation query is an important but costly operation in database management systems. In the worst case, to compute an aggregate, all tuples in a database needs to be examined. However, in many applications (on-line analysis, etc.), we need to compute the aggregates very fast. In the Ph.D. research, we focus on devising specialized indices for the box-aggregation query and its relatives. O...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Computer Applications
سال: 2012
ISSN: 0975-8887
DOI: 10.5120/8571-2303