When should data replication be used in distributed database systems to deal with data fragmentation? It seems that the processes of replication and fragmentation cannot work together. How does fragmentation occur in a horizontal vs vertical direction? Give me an illustration of your point of view, please.

How does data replication work in a distributed database architecture, and what are its benefits?

When should distributed database systems employ data replication to address data fragmentation if it is a problem? It seems that the processes of fragmentation and replication are incompatible. What distinguishes vertical fragmentation from horizontal fragmentation? Give me an example so I can better grasp your position.

When should data replication and data fragmentation be used in distributed database systems? What about combining replication and fragmentation? Can you explain the distinction between vertical and horizontal fragmentation? Could you provide me an illustration of your argument?