Keyphrases
- database
- response time
- query processing
- query evaluation
- database queries
- object oriented databases
- query expansion
- query execution
- range queries
- relevance feedback
- data structure
- keywords
- user queries
- query formulation
- multiple queries
- heterogeneous databases
- schema evolution
- boolean queries
- complex queries
- retrieval method
- cost model
- query terms
- user interaction
- nearest neighbor
- data sources
- database systems