What happens to existing jobs when enabling encryption at rest?

Enabling encryption at rest in a data environment adds an additional layer of security by ensuring that data is encrypted when stored. This process involves the use of cryptographic algorithms to safeguard the data, which generally requires more resources to encrypt and decrypt data as it is accessed.

When encryption at rest is enabled, existing jobs do not automatically run faster; in fact, the opposite is more likely. The overhead associated with encryption can lead to a slight to moderate increase in background load as the system must devote additional resources to manage the encryption process. This increased load may impact overall performance, especially in environments with a high volume of data access or processing tasks, as every read and write operation must now involve encryption and decryption.

Thus, the correct understanding is that while existing jobs are not altered in terms of their underlying processes, the introduction of encryption at rest necessitates greater demand on system resources, resulting in a moderate increase in background processing load. This explains why enabling encryption at rest can lead to an increase in overall system load and potentially affect job performance.