What can a database administrator (DBA) implement to ensure that their client’s data is always accessible?

What can a database administrator (DBA) implement to ensure that their client’s data is always accessible?

• A. Data normalization
• B. Data replication
• C. Data encryption
• D. Data redundancy

Answer: (D)

To ensure that a client’s data is always accessible, implementing data redundancy is vital. Data redundancy involves creating multiple copies of data and storing them in different locations or formats. This practice enhances data availability and reliability, as it mitigates the risks associated with data loss due to hardware failures, corruption, or any other unforeseen incidents.

By having redundant copies of data, a database administrator can ensure that if one copy becomes unavailable, other copies can take over, enabling continuous access to the required data. This redundancy can be achieved through various methods such as database mirroring, backup systems, and clustering, all of which serve to protect against data loss and provide high availability.

Data normalization, while important for reducing data redundancy within a database structure to eliminate anomalies, does not directly address accessibility concerns. Data replication, similar to redundancy, can also enhance availability but focuses on maintaining copies across different systems, which may not be as effective as a straightforward redundancy approach. Data encryption, on the other hand, secures data but does not inherently affect its accessibility in the event of a data loss scenario.