Keyphrases
- query optimization
- database systems
- distributed query processing
- cost model
- query execution plans
- query processing
- distributed systems
- cost estimation
- multidatabase systems
- query execution
- cardinality estimation
- semantic query optimization
- data placement
- parallel query processing
- distributed environment
- selectivity estimation
- xml data
- efficient execution
- approximate query answering
- query scheduling
- join queries
- query optimizers
- recursive queries
- query optimizer
- continuous queries
- storage structures
- query execution plan
- query evaluation
- data structure