MySQL Server supports a keyring that enables internal server components and plugins to securely store sensitive information for later retrieval. See Section 6.4.4, “The MySQL Keyring”.
As of MySQL 8.0.16, the keyring_keys table exposes metadata for keys in the keyring. Key metadata includes key IDs, key owners, and backend key IDs. The keyring_keys table does not expose any sensitive keyring data such as key contents.
The keyring_keys table has these columns:
KEY_ID
The key identifier.
KEY_OWNER
The owner of the key.
BACKEND_KEY_ID
The ID used for the key by the keyring backend.
The keyring_keys table has no indexes.
TRUNCATE TABLE is not permitted for the keyring_keys table.