Encryption of tables and tablespaces was added in MariaDB 10.1.3.
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 has the following columns:
| Column | Description | Added |
|---|---|---|
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. | MariaDB 10.1.13 |
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. |
MariaDB 10.2.5, MariaDB 10.1.23 |
When the InnoDB system tablespace is encrypted, it is represented in this table with the special name: innodb_system.
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)
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Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/information-schema-innodb_tablespaces_encryption-table/