Keyphrases
- query optimization
- distributed data streams
- data streams
- database systems
- cost model
- query processing
- multidatabase systems
- query execution
- cardinality estimation
- data placement
- cost estimation
- query optimizer
- query scheduling
- distributed environment
- semantic query optimization
- query execution plans
- continuous queries
- xml data
- join queries
- sparql queries
- sliding window
- data mining
- efficient execution
- integrity constraints
- building blocks
- approximate query answering
- query execution plan