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