Keyphrases
- query processing
- database
- response time
- lower bound
- upper bound
- query formulation
- query expansion
- relevance feedback
- user queries
- complex queries
- query evaluation
- query execution
- query cost
- database queries
- aggregate queries
- retrieval systems
- worst case
- average case
- keywords
- space complexity
- lower and upper bounds
- maintenance cost
- vector space
- retrieval method
- error correction
- cost model
- memory requirements
- query terms
- user defined
- relevant documents
- data sources
- computational complexity
- data structure
- database systems