Re: Best practice for exposing proprietary databases or services as SPARQL endpoints

Dear all:
Are there really no experiences beyond academic research regarding  
this task? I had assumed it was a pretty standard requirement...

Best

Martin

On 11.12.2010, at 09:33, Martin Hepp wrote:

> Dear all:
>
> There are many different ways of exposing existing relational  
> databases as SPARQL, e.g. as summarized by [1], namely Virtuoso's  
> RDF Views, D2RQ, and Triplify.
>
> I am looking for best practices / recommendations for the following  
> scenario:
>
> 1. There is a large and highly dynamic product or services database;  
> part of the data (e.g. prices) may even come from external Web  
> services (think of airfare, hotel prices).
> 2. I want to make this accessible as a SPARQL endpoint using  
> GoodRelations and FOAF.
> 3. The mapping from the original data structures to the proper RDF  
> must be hand-crafted anyway, so automation of this process is not  
> important
> 4. Creating RDF dumps is not feasible due to
>
> - the dynamics of the data
> - the combinatorial complexity (not all combinations may be  
> materialized in the database; think of product variants).
>
> Key requirements for me are:
>
> 1. Maturity of the software (alpha / beta releases are no option)
> 2. Scalability - the SPARQL endpoint must handle tens of thousands  
> of request per hour
> 3. Resource management for the endpoint - it must be possible to  
> protect the SPARQL endpoint from costly queries and return just a  
> subset or refuse a query
> 4. Resource management for the underlying RDBMS or Web services - it  
> must be possible to protect the original RDBMS and involved Web  
> services from excessive traffic (both willful ("Semantic DDoS") and  
> unintentional (PhD students' Python scrips gone wild).
>
> What would you recommend? My main point is really: Which tools /  
> architecture would you recommend if failure is not an option?
>
> Thanks for any opinions!
>
>
> Best
>
> Martin
>
> [1] A Survey of Current Approaches for  Mapping of Relational  
> Databases to RDF (PDF), Satya S. Sahoo, Wolfgang Halb, Sebastian  
> Hellmann, Kingsley Idehen, Ted Thibodeau Jr, Sören Auer, Juan  
> Sequeda, Ahmed Ezzat, 2009-01-31.
> http://www.w3.org/2005/Incubator/rdb2rdf/RDB2RDF_SurveyReport.pdf
>
> --------------------------------------------------------
> martin hepp
> e-business & web science research group
> universitaet der bundeswehr muenchen
>
> e-mail:  hepp@ebusiness-unibw.org
> phone:   +49-(0)89-6004-4217
> fax:     +49-(0)89-6004-4620
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>         http://www.heppnetz.de/ (personal)
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> twitter: mfhepp
>
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>

Received on Wednesday, 15 December 2010 01:21:36 UTC