DocumentCode :
3372870
Title :
An effective wrapper architecture to heterogeneous data source
Author :
Wang, Hongzhi ; Li, Jianzhong ; He, Zhenying
Author_Institution :
Dept. of Comput. Sci. & Technol., Harbin Inst. of Technol., China
fYear :
2003
fDate :
27-29 March 2003
Firstpage :
565
Lastpage :
568
Abstract :
In this paper, we focus on the problem in information integration systems of obtaining data from an heterogeneous data source accurately and effectively. XML is used as data exchange format of the wrapper. We design the wrapper architecture based on the conversion and management of the views as the bridge from global schema to local schema of various data sources. Our wrapper has two main subsystems, the data extract subsystem and query executor subsystem. The former is for loading data for the cache in the mediator when changes more than threshold are detected, and the latter is for answering the query from the mediator. The architecture adapts to the data and schema change of the data source and could answer the query of the mediator effectively. Considering the wrapper may run in the environment without control, the process in the wrapper should be simple enough. The storage in the wrapper itself should be as small as possible and the storage of data source could be used. The detail of the module query rewrite, view management, query merge, result wrap and schema change detect are discussed. The behavior of the wrapper during the query process in the wrapper is discussed with a running example. The security strategy, especially in the distance that the wrapper runs in autonomic data source, is also introduced in this paper.
Keywords :
cache storage; data structures; distributed databases; distributed programming; electronic data interchange; hypermedia markup languages; query processing; security of data; XML; cache data loading; data conversion; data exchange format; data extract subsystem; effective wrapper architecture; global schema; heterogeneous data source; information integration system; local schema; module query rewrite; query answering; query executor subsystem; query merge; result wrap; schema change; security strategy; view management; Bridges; Computer architecture; Computer science; Data mining; Data security; Helium; Process control; Query processing; Web pages; XML;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Information Networking and Applications, 2003. AINA 2003. 17th International Conference on
Print_ISBN :
0-7695-1906-7
Type :
conf
DOI :
10.1109/AINA.2003.1192945
Filename :
1192945
Link To Document :
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