Keyphrases
- query optimization
- database systems
- sparql queries
- query execution plan
- query processing
- cost model
- data sources
- multidatabase systems
- cardinality estimation
- cost estimation
- semantic web
- xml data
- query execution
- databases
- query optimizers
- data placement
- linked data
- query optimizer
- relational data
- data model
- query scheduling
- distributed systems
- query language
- metadata
- approximate query answering
- database
- query execution plans
- selectivity estimation
- execution plan
- recursive queries