Call For Paper Volume:4 Issue:8 Aug'2017 |

Dynamic Query Aggregation at Data Aggregators

Publication Date : 10/07/2015



Author(s) :

Komal D Chopra , Tejesh K Niwate , Mahammad Shabana.


Conference Name :
4th International Conference on Recent Trends in Engineering & Technology(ICRTET-2015) July 2-4,2015 Organized by SNJB's KBJ College of Engineering,Chandwad,Nashik,Maharashtra,India



Abstract :

Many applications in today’s world uses dynamic data i.e. time-varying data, so there may be some inaccuracy in the result. In some cases inaccuracy is tolerable by client and that is known as incoherency bound. Client in his query specifies the coherency value as his requirement along with the query. The query is given to data source and then executed at specific data aggregators to obtain optimal results. The client query is decomposed into sub-queries and then executed at chosen data aggregator with individual sub-query incoherency bound. To maintain dynamics of data and user’s coherency requirement data needs to be updated. This updating of data is done using data dissemination techniques. Two techniques are available pull based and push based data dissemination technique. Here we present push based data dissemination technique for updating data at source and greedy heuristics to divide the query into Sub-queries. We also present techniques to reduce the number of refresh messages.


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