Whoever has access to your keys also has access to your data
Good key management can be reduced to one simple sentence: Anyone who has access to your cryptographic keys has access to all data that were encrypted with them. In the era of cloud computing this means: if the database and key management are not separated, or if the key management is not in your hands, then this is a potential security gap.
If you want to encrypt your sensitive data, software vendors often offer directly integrated solutions. However, if your goal is to maintain sole control over your data, eperi offers specialized solutions suitable for your application or database.