Keyphrases
- query optimization
- query processing
- query execution
- query execution plan
- queries involving
- query optimizer
- query scheduling
- cost model
- query execution plans
- cardinality estimation
- selectivity estimation
- recursive queries
- query rewriting
- query plan
- join queries
- database systems
- complex queries
- multidatabase systems
- query optimizers
- execution plan
- efficient execution
- approximate query answering
- efficient query processing
- cost estimation
- semantic query optimization
- query evaluation
- xml data
- sparql queries
- database
- user queries
- response time
- join operators
- multidatabase environment
- query containment
- rewrite rules
- query result
- efficient processing
- data management
- relational queries
- similarity search
- data sources