1.How do information retrieval systems work in comparison with databases

2. Explain the functioning of an inverted index

3. You are asked to use a distributed database design for the sole purpose of making sure that when the primary database server fails, a redundant copy is available. Describe in what ways this scenario is the same or different from more general distributed database scenarios.

4. Explain Two-Phase Commit as the generalization to a regular commit in a non-distributed database.