Information Schema INNODB_TABLESPACES_ENCRYPTION Table

The INNODB_TABLESPACES_ENCRYPTION table provides metadata about encrypted InnoDB tablespaces, including key versions and rotation status.

The Information Schema INNODB_TABLESPACES_ENCRYPTION table contains metadata about encrypted InnoDB tablespaces. When you enable encryption for an InnoDB tablespace, an entry for the tablespace is added to this table. If you later disable encryption for the InnoDB tablespace, then the row still remains in this table, but the ENCRYPTION_SCHEME and CURRENT_KEY_VERSION columns will be set to 0.

Viewing this table requires the PROCESS privilege. It contains the following columns:

Column	Description
SPACE	InnoDB tablespace ID.
NAME	Path to the InnoDB tablespace file, without the extension.
ENCRYPTION_SCHEME	Key derivation algorithm. Only 1 is currently used to represent an algorithm. If this value is 0, then the tablespace is unencrypted.
KEYSERVER_REQUESTS	Number of times InnoDB has had to request a key from the encryption key management plugin. The three most recent keys are cached internally.
MIN_KEY_VERSION	Minimum key version used to encrypt a page in the tablespace. Different pages may be encrypted with different key versions.
CURRENT_KEY_VERSION	Key version that will be used to encrypt pages. If this value is 0, then the tablespace is unencrypted.
KEY_ROTATION_PAGE_NUMBER	Page that a background encryption thread is currently rotating. If key rotation is not enabled, then the value will be NULL.
KEY_ROTATION_MAX_PAGE_NUMBER	When a background encryption thread starts rotating a tablespace, the field contains its current size. If key rotation is not enabled, then the value will be NULL.
CURRENT_KEY_ID	Key ID for the encryption key currently in use.
ROTATING_OR_FLUSHING	Current key rotation status. If this value is 1, then the background encryption threads are working on the tablespace. See MDEV-11738.

When the InnoDB system tablespace is encrypted, it is represented in this table with the special name: innodb_system.

Example

SELECT * FROM information_schema.INNODB_TABLESPACES_ENCRYPTION 
WHERE NAME LIKE 'db_encrypt%';
+-------+----------------------------------------------+-------------------+--------------------+-----------------+---------------------+--------------------------+------------------------------+
| SPACE | NAME                                         | ENCRYPTION_SCHEME | KEYSERVER_REQUESTS | MIN_KEY_VERSION | CURRENT_KEY_VERSION | KEY_ROTATION_PAGE_NUMBER | KEY_ROTATION_MAX_PAGE_NUMBER |
+-------+----------------------------------------------+-------------------+--------------------+-----------------+---------------------+--------------------------+------------------------------+
|    18 | db_encrypt/t_encrypted_existing_key          |                 1 |                  1 |               1 |                   1 |                     NULL |                         NULL |
|    19 | db_encrypt/t_not_encrypted_existing_key      |                 1 |                  0 |               1 |                   1 |                     NULL |                         NULL |
|    20 | db_encrypt/t_not_encrypted_non_existing_key  |                 1 |                  0 |      4294967295 |          4294967295 |                     NULL |                         NULL |
|    21 | db_encrypt/t_default_encryption_existing_key |                 1 |                  1 |               1 |                   1 |                     NULL |                         NULL |
|    22 | db_encrypt/t_encrypted_default_key           |                 1 |                  1 |               1 |                   1 |                     NULL |                         NULL |
|    23 | db_encrypt/t_not_encrypted_default_key       |                 1 |                  0 |               1 |                   1 |                     NULL |                         NULL |
|    24 | db_encrypt/t_defaults                        |                 1 |                  1 |               1 |                   1 |                     NULL |                         NULL |
+-------+----------------------------------------------+-------------------+--------------------+-----------------+---------------------+--------------------------+------------------------------+
7 rows in set (0.00 sec)

See Also

• Encrypting Data for InnoDB / XtraDB

• Data at Rest Encryption

• Why Encrypt MariaDB Data?

• Encryption Key Management

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