Keyphrases
- response time
- query processing
- query evaluation
- user queries
- database
- keywords
- relevance feedback
- query expansion
- database queries
- databases
- dependent features
- random sampling
- indexing techniques
- search queries
- sample size
- multi dimensional
- range queries
- keyword search
- user defined
- data sources
- retrieval method
- answering queries
- skewed data
- learning algorithm