High energy & nuclear physics


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



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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




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