Questions

1. Choose the correct statement related to the header-temporal concept:
   1. It cannot manage references using primary and foreign keys.
   2. The header consists of the current valid data; the temporal layer is used just for the history.
   3. Future valid data cannot be managed by it.
   4. The header layer is used for the references; attribute values are stored separately in a temporal manner.
2. Which model does not use temporal management?
   1. A conventional model
   2. A uni-temporal model
   3. A bi-temporal model
   4. A fixed temporal model
3. Historical states can lose their importance and relevance by being removed from the main system or moved to an aggregated data warehouse repository. Which aspect characterizes these options?
   1. Relevance
   2. Transaction support
   3. Limited temporal usability
   4. Correctness
4. How many dimensions are covered by the IPL model?
   1. 1
   2. 2
   3. 3
   4. 4
5. Which system takes the validity for each column separately to optimize the storage demands if the frequency rate of the changes for individual attributes is not...