What impact does enabling encryption at rest have on Tableau Server performance?

Enabling encryption at rest in Tableau Server requires the system to encrypt and decrypt data stored on disk. This process introduces additional computational overhead, which can lead to a slight to moderate increase in load, particularly for background processes such as extract refreshes, data loading, and other operations that involve reading from or writing to stored data. The encryption and decryption operations necessitate CPU resources, which can impact performance, especially when the server is handling large datasets or numerous simultaneous operations.

The introduction of encryption ensures data security, but it can come at the cost of performance, which is why this choice accurately reflects the impact that enabling encryption at rest has on Tableau Server. This does not imply severe performance degradation but indicates a measurable increase in resource usage during these operations.

The other options do not align with the effects of encryption at rest. For instance, while load times may not necessarily decrease or enhance, the option stating that there is no significant impact observed does not account for the additional background processing workload that encryption entails. Similarly, the claim that encryption would decrease backup file size runs counter to the nature of encryption, which typically results in some overhead rather than compression.