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By Ken North
The OGSA-DAI project announced the release of OGSA-DAI
3.0, a middleware product that provides web services to access SQL and XML databases. Developers can use OGSA-DAI to provide data access in grid computing
environments.
| OGSA-DAI provides a framework for exposing disparate data sources, databases, files and other data sources, to the Grid
via web services. But an important additional feature is a workflow engine that enables grid users to define retrieval, update and transformation operations.
It's possible to access multiple databases in the scope of a single workflow. |
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The workflow engine supports both
synchronous and asynchronous execution. In synchronous mode, it returns results only when the entire workflow is complete. For responsive clients, asynchronous mode is a better choice
because it returns results after the first request submission to the OGSA-DAI server. Workflows can use FTP to deliver results of query processing. OGSA-DAI provides
transformation activities that supports processing such as transforming SQL rows to XML-based WebRowSets. It also provides two aggregation activities that can group
data from RowSets and WebRowSets into larger block for more efficient network transfers. The OGSA-DAI software conforms to the Open Grid
Forum's Database Access and Integration Services (DAIS) specifications of March 2003. Release 3.0 is a complete rewrite of the OGSA-DAI software. There are versions
that comply with Axis 1.4, Axis 1.2.1 and the Globus Toolkit 4.0.5. Developers working on the OGSA-DAI software must conform to development
standards for Java and XML and the software is copyrighted by the University of Edinburgh. The OGSA-DAI middleware has been tested with drivers for eXist, IBM DB2, Microsoft SQL Server,
MySQL, Oracle and PostgreSQL databases. Using Globus Toolkit 4.0.5, OGSA-DAI middleware, DBMS-vendor supplied JDBC drivers and an array size of 5000 characters
produced the following mean execution times for aggregating for 10,000 rows:
Figure 1: "Mean Times for 10000 Row by DBMS"
enlarge OGSA-DAI is a partner in the Open Middleware Infrastructure
Institute UK (OMII-UK), funded through the UK e-Science Core program, and a collaboration between the Universities of Southampton, Edinburgh and Manchester.
OMII-UK
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