SHOW ENGINES
Syntax
SHOW ENGINES
displays status information about the server's storage engines. This is particularly useful for checking whether a storage engine is supported, or to see what the default engine is.
mysql> SHOW ENGINES\G
*************************** 1. row ***************************
Engine: MEMORY
Support: YES
Comment: Hash based, stored in memory, useful for temporary tables Transactions: NO
XA: NO
Savepoints: NO
*************************** 2. row ***************************
Engine: MyISAM
Support: DEFAULT
Comment: Default engine as of MariaDB 3.23 with great performance Transactions: NO
XA: NO
Savepoints: NO
*************************** 3. row ***************************
Engine: InnoDB
Support: YES
Comment: Supports transactions, row-level locking, and foreign keys Transactions: YES
XA: YES
Savepoints: YES
*************************** 4. row ***************************
Engine: EXAMPLE
Support: YES
Comment: Example storage engine Transactions: NO
XA: NO
Savepoints: NO
*************************** 5. row ***************************
Engine: ARCHIVE
Support: YES
Comment: Archive storage engine Transactions: NO
XA: NO
Savepoints: NO
*************************** 6. row ***************************
Engine: CSV
Support: YES
Comment: CSV storage engine Transactions: NO
XA: NO
Savepoints: NO
*************************** 7. row ***************************
Engine: BLACKHOLE
Support: YES
Comment: /dev/null storage engine (anything you write ยป
to it disappears)
Transactions: NO
XA: NO
Savepoints: NO
*************************** 8. row ***************************
Engine: FEDERATED
Support: YES
Comment: Federated MariaDB storage engine Transactions: NO
XA: NO
Savepoints: NO
*************************** 9. row ***************************
Engine: MRG_MYISAM
Support: YES
Comment: Collection of identical MyISAM tables Transactions: NO
XA: NO
Savepoints: NO
The output from SHOW ENGINES
may vary according to the MariaDB version used and other factors. The values shown in the Support
column indicate the server's level of support for the storage engine, as shown in the following table.
Value | Meaning |
---|---|
YES
| The engine is supported and is active |
DEFAULT
| Like YES , plus this is the default engine
|
NO
| The engine is not supported |
DISABLED
| The engine is supported but has been disabled |
A value of NO
means that the server was compiled without support for the engine, so it cannot be enabled at runtime.
A value of DISABLED
occurs either because the server was started with an option that disables the engine, or because not all options required to enable it were given. In the latter case, the error log file should contain a reason indicating why the option is disabled. See , "The Error Log".
You might also see DISABLED
for a storage engine if the server was compiled to support it, but was started with a --skip-
option.
engine_name
All MariaDB servers support MyISAM
tables, because MyISAM
is the default storage engine. It is not possible to disable MyISAM
.
The Transactions
, XA
, and Savepoints
columns indicate whether the storage engine supports transactions, XA transactions, and savepoints, respectively.