Keyphrases
- response time
- query processing
- database
- database queries
- user queries
- query evaluation
- query formulation
- retrieval method
- data sources
- complex queries
- relevance feedback
- efficient processing
- query expansion
- retrieval systems
- search queries
- indexing techniques
- boolean queries
- query execution
- result set
- original query
- cost model
- keyword search
- range queries
- web search engines
- data structure
- keywords
- databases