Index features
Index features
- Traditional databases:
- primary index with a unique mapping (good to have)
- secondary indexes (for non-unique attributes)
- refer to stored objects (more maintenance as DB is updated)
- refer to primary index (slower access)
- Bibliographic Databases
- one super-index (it's all words)
- efficient operations to create unions and intersects
- needed for synonyms (fast, speedy)
- reduce result, and define domain (nail, hammer)
- Image databases need both !