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 environmentsCharacteristics:- 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
Dostları ilə paylaş: |
