High energy & nuclear physics

Individual perfs are not necessarily consistent with the global (system) perf !

• Individual perfs are not necessarily consistent with the global (system) perf !

• Grid problems

• predictions are not definitive: dynamicity !
• Heterogeneous platforms
• Checkpointing and migration

What is to be stored ?

• What is to be stored ?

• virtual organizations, people, computing resources, software packages, communication resources, event producers, devices…
• what about data ???

• A key issue in such dynamics environments

• Characteristics:

• dynamicity
• complex relationships
• frequent updates
• complex queries

A first approach : (distributed) directory (LDAP)

• A first approach : (distributed) directory (LDAP)

• easy to use
• tree structure
• distribution
• static
• mostly read ; not efficient updating
• hierarchical
• poor procedural language

• A second approach: (relational) database