Executive Summary

ubQL is a distributed query language for programming large-scale distributed query systems such as resource sharing systems. The language is obtained by adding a small set of mobile process primitives (communication channels, migration operators, etc.) on top of any traditional query language. Queries are encapsulated into processes and can migrate between sites thus enabling cooperation. An important methodological device is the separation of the installation (including migration) of query processes from the distributed execution of the queries.

Project Members

Publications

• ubQL, a Language for Programming Distributed Query Systems [abstract] [.ps] [.pdf] 
  International Workshop on the Web and Databases (WebDB) (2001)
  Arnaud Sahuguet   Val Tannen   
  

• Resource Sharing Through Query Process Migration [.pdf] 
  Technical Report MS-CIS-01-10 (2001)
  Arnaud Sahuguet   Val Tannen   
  

• Chaining, Referral, Subscription, Leasing: New Mechanisms in Distributed Query Optimization [abstract] [.ps] [.pdf] 
  unpublished (2000)
  Arnaud Sahuguet   Benjamin Pierce   Val Tannen   
  

• Distributed Query Optimization: Can Mobile Agents Help? [.ps] [.pdf] 
  unpublished (2000)
  Arnaud Sahuguet   Benjamin Pierce   Val Tannen