Keyphrases
- database
- query evaluation
- query processing
- user queries
- response time
- query formulation
- data sources
- query expansion
- database queries
- complex queries
- range queries
- retrieval systems
- user interaction
- efficient processing
- relevance feedback
- heterogeneous databases
- data structure
- keywords
- answering queries
- object retrieval
- query execution
- query optimization
- result set
- indexing techniques
- search queries
- information retrieval systems
- image database
- natural language
- multimedia
- data sets