Keyphrases
- response time
- database
- user queries
- query processing
- relevance feedback
- query expansion
- data sources
- retrieval systems
- query evaluation
- access methods
- variable length
- database queries
- query execution
- retrieval accuracy
- original query
- answering queries
- query formulation
- range queries
- heterogeneous databases
- result set
- query refinement
- search queries
- keyword search
- query terms
- user defined
- user interaction
- active learning
- data model
- keywords
- metadata