Keyphrases
- query optimization
- database systems
- cost model
- multidatabase systems
- query processing
- xml data
- cost estimation
- query execution
- selectivity estimation
- data placement
- efficient execution
- efficient query processing
- cardinality estimation
- query scheduling
- query optimizer
- semantic query optimization
- query optimizers
- approximate query answering
- query execution plan
- data management
- execution plan
- query language
- data mining
- databases