Which disaster recovery technique best helps a large online retailer maintain database consistency and availability in real-time?

Which disaster recovery technique best helps a large online retailer maintain database consistency and availability in real-time?

• A. Replication
• B. Mirroring
• C. Backups
• D. Cloud storage

Answer: (A)

Replication is a disaster recovery technique that involves copying and maintaining database objects, such as tables and stored procedures, in multiple locations. This method is particularly beneficial for a large online retailer because it allows for real-time data updates across various systems. By using replication, any changes made to the database can be immediately reflected in the replicated databases, ensuring that all users have access to the latest data regardless of which server they are connected to. This approach not only helps maintain database consistency, as all replicas can be kept up-to-date with the latest transactions, but it also enhances availability. In the event of a failure at one site, other replicated sites can take over seamlessly, reducing downtime and ensuring that the retailer can continue operating smoothly without losing critical data. In contrast, while mirroring can provide similar benefits regarding data redundancy, it primarily focuses on keeping two systems synchronized and may not scale as efficiently as replication in a large environment. Backups are essential for disaster recovery but are not suitable for real-time consistency since they rely on periodic snapshots of the data. Cloud storage can provide scalable storage solutions and is great for off-site data management but does not inherently ensure real-time data consistency or availability as replication does. Thus, replication stands out as the most effective technique for achieving

Replication is a disaster recovery technique that involves copying and maintaining database objects, such as tables and stored procedures, in multiple locations. This method is particularly beneficial for a large online retailer because it allows for real-time data updates across various systems. By using replication, any changes made to the database can be immediately reflected in the replicated databases, ensuring that all users have access to the latest data regardless of which server they are connected to.

This approach not only helps maintain database consistency, as all replicas can be kept up-to-date with the latest transactions, but it also enhances availability. In the event of a failure at one site, other replicated sites can take over seamlessly, reducing downtime and ensuring that the retailer can continue operating smoothly without losing critical data.

In contrast, while mirroring can provide similar benefits regarding data redundancy, it primarily focuses on keeping two systems synchronized and may not scale as efficiently as replication in a large environment. Backups are essential for disaster recovery but are not suitable for real-time consistency since they rely on periodic snapshots of the data. Cloud storage can provide scalable storage solutions and is great for off-site data management but does not inherently ensure real-time data consistency or availability as replication does. Thus, replication stands out as the most effective technique for achieving