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