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