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