Keyphrases
- query processing
- database
- response time
- query expansion
- data sources
- user queries
- databases
- query formulation
- vector space
- neural network
- aggregate queries
- original query
- query execution
- user interaction
- complex queries
- query evaluation
- database queries
- heterogeneous databases
- object retrieval
- range queries
- peer to peer
- information retrieval systems
- relevance feedback
- data structure
- database systems
- data sets