Keyphrases
- database
- query processing
- response time
- query evaluation
- data structure
- database queries
- software tools
- vector space
- data sets
- aggregate queries
- complex queries
- query expansion
- query optimization
- efficient processing
- data sources
- user defined
- data objects
- data management
- object oriented
- relevance feedback
- query execution
- query formulation
- computer programs
- free software