Keyphrases
- query optimization
- query processing
- queries involving
- semantic query optimization
- selectivity estimation
- query execution plans
- join queries
- recursive queries
- efficient query processing
- query plan
- query optimizers
- database systems
- cost model
- query scheduling
- efficient execution
- approximate query answering
- execution plan
- query rewriting
- query processing and optimization
- query containment
- multidatabase systems
- cardinality estimation
- query execution plan
- complex queries
- database
- sparql queries
- cost estimation
- query execution
- efficient processing
- query evaluation
- query language
- xml data
- query optimizer
- join operators
- relational database systems
- response time
- storage and retrieval
- data management
- range queries
- continuous queries
- xpath queries
- database queries
- r tree
- data integration
- data sources
- databases