Keyphrases
- query optimization
- database systems
- cost model
- query processing
- cost estimation
- multidatabase systems
- data placement
- semantic query optimization
- xml data
- query execution
- query scheduling
- cardinality estimation
- query execution plans
- query optimizer
- query plan
- approximate query answering
- join queries
- efficient query processing
- data model
- recursive queries
- efficient execution
- relational databases
- web services
- data mining
- database