Keyphrases
- database
- user queries
- query processing
- response time
- query expansion
- query evaluation
- heterogeneous databases
- object retrieval
- relevance feedback
- complex queries
- indexing techniques
- neural network
- query formulation
- query execution
- range queries
- user defined
- user interaction
- data sources
- data structure
- search queries
- relevant documents
- cost model
- retrieval method
- probabilistic model
- metadata
- multiple queries