What is the main function of "dynamic tiering" in HANA?

Dynamic tiering in HANA primarily serves to optimize data storage by allowing less frequently accessed data to be moved to less expensive storage while retaining the more critical, frequently accessed data in-memory. This approach enables organizations to manage their data more effectively by balancing performance and cost.

By implementing dynamic tiering, companies can take advantage of various storage types, ensuring that high-performance resources are reserved for data that requires rapid access, while still maintaining the ability to store larger volumes of data at a lower cost. This is particularly beneficial for large data sets where not all data is accessed regularly, thus optimizing both performance and operational expenses in the database environment.

The other options do not accurately represent the purpose of dynamic tiering. While increasing storage capacity, enhancing encryption features, and replicating data across nodes are important database functionalities, they do not fulfill the core function of dynamic tiering to optimize storage costs based on data access frequency.