Keyphrases
- query optimization
- database systems
- cost model
- multidatabase systems
- cardinality estimation
- query processing
- cost estimation
- query scheduling
- data placement
- xml data
- query optimizer
- query execution
- query execution plans
- user preferences
- selectivity estimation
- semantic web
- recursive queries
- distributed database systems
- continuous queries
- database management systems
- join queries
- multi dimensional
- query optimizers
- data sources
- databases
- database