SHOW ENGINES

SHOW [STORAGE] ENGINES

SHOW ENGINES muestra la información de estado sobre los motores de almacenamiento. Esto es particularmente útil para comprobar si un motor de almacenamiento está soportado, o para ver cual es el motor de almacenamiento por defecto. Esta sentencia está implementada a partir de MySQL 4.1.2. SHOW TABLE TYPES es un sinónimo desaconsejado.

mysql> SHOW ENGINES\G
*************************** 1. row ***************************
 Engine: MyISAM
Support: DEFAULT
Comment: Default engine as of MySQL 3.23 with great performance
*************************** 2. row ***************************
 Engine: HEAP
Support: YES
Comment: Alias for MEMORY
*************************** 3. row ***************************
 Engine: MEMORY
Support: YES
Comment: Hash based, stored in memory, useful for temporary tables
*************************** 4. row ***************************
 Engine: MERGE
Support: YES
Comment: Collection of identical MyISAM tables
*************************** 5. row ***************************
 Engine: MRG_MYISAM
Support: YES
Comment: Alias for MERGE
*************************** 6. row ***************************
 Engine: ISAM
Support: NO
Comment: Obsolete storage engine, now replaced by MyISAM
*************************** 7. row ***************************
 Engine: MRG_ISAM
Support: NO
Comment: Obsolete storage engine, now replaced by MERGE
*************************** 8. row ***************************
 Engine: InnoDB
Support: YES
Comment: Supports transactions, row-level locking, and foreign keys
*************************** 9. row ***************************
 Engine: INNOBASE
Support: YES
Comment: Alias for INNODB
*************************** 10. row ***************************
 Engine: BDB
Support: YES
Comment: Supports transactions and page-level locking
*************************** 11. row ***************************
 Engine: BERKELEYDB
Support: YES
Comment: Alias for BDB
*************************** 12. row ***************************
 Engine: NDBCLUSTER
Support: YES
Comment: Clustered, fault-tolerant, memory-based tables
*************************** 13. row ***************************
 Engine: NDB
Support: YES
Comment: Alias for NDBCLUSTER
*************************** 14. row ***************************
 Engine: EXAMPLE
Support: YES
Comment: Example storage engine
*************************** 15. row ***************************
 Engine: ARCHIVE
Support: YES
Comment: Archive storage engine
*************************** 16. row ***************************
 Engine: CSV
Support: YES
Comment: CSV storage engine
*************************** 17. row ***************************
 Engine: FEDERATED
Support: YES
Comment: Federated MySQL storage engine

El valor Support indica si un motor de almacenamiento en particular está soportado, y cual es el motor por defecto. Por ejemplo, si el servidor se arranca con la opción --default-table-type=InnoDB, entonces el valor Support para la fila InnoDB será el valor DEFAULT.

_(4.1.1)