Keyphrases
- query processing
- database
- response time
- user queries
- database queries
- query evaluation
- data sources
- relevance feedback
- range queries
- efficient processing
- query terms
- query formulation
- retrieval method
- aggregate queries
- original query
- query refinement
- object retrieval
- query execution
- result set
- keyword search
- user defined
- index structure
- query expansion
- keywords
- information retrieval