Keyphrases
- query optimization
- multidatabase systems
- database systems
- cost model
- query processing
- cost estimation
- query execution
- multidatabase environment
- xml data
- cardinality estimation
- query scheduling
- data placement
- semantic query optimization
- query optimizer
- transaction management
- recursive queries
- selectivity estimation
- query execution plans
- query optimizers
- databases
- query plan
- relational databases
- building blocks