Keyphrases
- query optimization
- database systems
- cost model
- multidatabase systems
- query processing
- cardinality estimation
- xml data
- semantic query optimization
- cost estimation
- data placement
- approximate query answering
- query optimizer
- data quality
- query execution
- efficient execution
- efficient query processing
- query scheduling
- recursive queries
- query plan
- query execution plan
- query execution plans
- databases
- query optimizers
- selectivity estimation
- continuous queries
- response time