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