DistributedQueryProcessing
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Distributed Query Processing †
We aim to develop tools for integrating heterogeneous data, including relational, XML and Web data sources. As part of this project, the OGSA-DQP service-based distributed query processor, which was developed as part of the OGSA-DAI UK e-Science project, has been extended to work with OGSA-WebDB and XML data sources.
A source release of the extensions is available here. The extensions are compatible with OGSA-DAI 3.0 Axis. You will need a working installation of OGSA-DQP 3.2.1 onto which the extensions can be applied.
Overview †
The following two tools for providing data integration for e-Science applications are extended:
OGSA-DAI (OGSA Data Access & Integration):
- Service-based Grid computing middleware.
- Built on OGSA 窶 the Open Grid Services Architecture
- Wraps various relational and XML databases.
- A way of securely exposing data via Web services.
OGSA-DQP (OGSA distributed query processor):
- Provides integration in the form of a distributed query processor.
- Uses OGSA-DAI wrappers.
- Also integrates analysis by invoking Web services.
- Declarative interface based on SQL.
- Other benefits include parallelism during query execution.
The extensions to OGSA-DQP:
- Provide support for querying Web-accessible databases.
- Provide support for XML data though extensions to the query language and evaluation infrastructure
Architecture †
The extended system is able to integrate OGSA-WebDB-wrapped databases, OGSA-DAI-wrapped relational/XML databases and analysis (Web) services.
Future Plans †
- Modify the query compiler to support a move expressive query language.
- Address performance issues by (i) investigating alternative query optimisation strategies, (ii) improving the efficiency of query evaluation infrastructure, in particular where data is fetched from OGSA-DAI and OGSA-WebDB.
Links †
Acknowledgements †
This work was made possible by the support of the Japan Society for the Promotion of Science (JSPS).
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