How many layers of encryption are typically available for a database?

Typically, databases offer multiple layers of encryption to safeguard sensitive data. The correct understanding is that applications can utilize different encryption methods at various stages of data handling.

When focusing on the number of layers, many databases indeed implement three primary layers of encryption:

1. Data at Rest: This ensures that stored data, such as files and databases on disks, is encrypted to protect it from unauthorized access in the event that storage devices are compromised.

2. Data in Transit: This layer protects data that is being transmitted over a network, ensuring that it remains confidential and intact during the transfer process, especially over potentially insecure networks.

3. Data in Use: This is an emerging area of focus where encryption is applied to data while it is being processed or accessed in memory, often using techniques like homomorphic encryption or secure enclaves.

Given this understanding, stating that there is only one layer of encryption oversimplifies the robust security measures that are put in place for database environments. A more accurate answer would reflect the multifaceted nature of encryption strategies employed by modern databases.