Give two reasons why data should be replicated across geographically dispersed data centres. Log records are used to enable replication in centralised databases. What is the situation? What is the...

Give two reasons why data should be replicated across geographically dispersed data centres.

1. Log records are used to enable replication in centralised databases. What is the situation?

What is the difference between replication in centralised databases and replication in parallel/distributed databases?