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This chapter looks into replication control, which is required to maintain consistent data in all sites.We will study the replication control techniques and the algorithms required for replication control.A transaction requesting a data item will have access to the same value in all the sites.

Within Active Directory, objects that are updated on one Domain Controller are then replicated to other domain controllers through multi-master replication.

However, by introducing new decision variables and reconsidering the offending inequalities, the model can be transformed to realize an optimization program entirely linear in structure.

Replication is useful in improving the availability of data by coping data at multiple sites.

As discussed earlier, replication is a technique used in distributed databases to store multiple copies of a data table at different sites.

The problem with having multiple copies in multiple sites is the overhead of maintaining data consistency, particularly during update operations.