High energy & nuclear physics

The medical data of a patient are often disseminated over multiple sites

• access rights/authentication problem, collection/integration of data into partial views, identification of data/users

Medical (meta-)data are complex and not yet (fully) standardized

• no global structure

Why is it so difficult ?

• Why is it so difficult ?

• multiple administrative domains
• very sensitive data => security/privacy issues
• wide distribution
• unpredictability
• relationship with data replica
• heterogeneity
• dynamicity (permanent production of large volumes of data)

• Centralized data warehouse ?

• Not realistic at a large scale and not acceptable

A proposition [Wehrle’s thesis]: virtual data warehouses on the grid

• A proposition [Wehrle’s thesis]: virtual data warehouses on the grid

• Components:

• a federated schema
• a set of partial views (“chunks”) materialized at the local system level

• Advantages

• Flexibility wrt users’ needs
• Good use of the storage capacity of the grid and scalability
• Security control at the local level
• Global view of the disseminated data