MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
SHOW [STORAGE] ENGINES 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.
For information about MySQL storage engines, see Chapter 17, The InnoDB Storage Engine, and Chapter 18, Alternative Storage Engines.
mysql> SHOW ENGINES\G *************************** 1. row *************************** Engine: ARCHIVE Support: YES Comment: Archive storage engine Transactions: NO XA: NO Savepoints: NO *************************** 2. row *************************** Engine: BLACKHOLE Support: YES Comment: /dev/null storage engine (anything you write to it disappears) Transactions: NO XA: NO Savepoints: NO *************************** 3. row *************************** Engine: MRG_MYISAM Support: YES Comment: Collection of identical MyISAM tables Transactions: NO XA: NO Savepoints: NO *************************** 4. row *************************** Engine: FEDERATED Support: NO Comment: Federated MySQL storage engine Transactions: NULL XA: NULL Savepoints: NULL *************************** 5. row *************************** Engine: MyISAM Support: YES Comment: MyISAM storage engine Transactions: NO XA: NO Savepoints: NO *************************** 6. row *************************** Engine: PERFORMANCE_SCHEMA Support: YES Comment: Performance Schema Transactions: NO XA: NO Savepoints: NO *************************** 7. row *************************** Engine: InnoDB Support: DEFAULT Comment: Supports transactions, row-level locking, and foreign keys Transactions: YES XA: YES Savepoints: YES *************************** 8. row *************************** Engine: MEMORY Support: YES Comment: Hash based, stored in memory, useful for temporary tables Transactions: NO XA: NO Savepoints: NO *************************** 9. row *************************** Engine: CSV Support: YES Comment: CSV storage engine Transactions: NO XA: NO Savepoints: NO The output from SHOW ENGINES may vary according to the MySQL version used and other factors.
SHOW ENGINES output has these columns:
EngineThe name of the storage engine.
SupportThe server's level of support for the storage engine, as shown in the following table.
Value Meaning YESThe engine is supported and is active DEFAULTLike YES, plus this is the default engineNOThe engine is not supported DISABLEDThe engine is supported but has been disabled A value of
NOmeans that the server was compiled without support for the engine, so it cannot be enabled at runtime.A value of
DISABLEDoccurs 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 should contain a reason indicating why the option is disabled. See Section 7.4.2, “The Error Log”.You might also see
DISABLEDfor a storage engine if the server was compiled to support it, but was started with a--skip-option. For theengine_nameNDBstorage engine,DISABLEDmeans the server was compiled with support for NDB Cluster, but was not started with the--ndbclusteroption.All MySQL servers support
MyISAMtables. It is not possible to disableMyISAM.CommentA brief description of the storage engine.
TransactionsWhether the storage engine supports transactions.
XAWhether the storage engine supports XA transactions.
SavepointsWhether the storage engine supports savepoints.
Storage engine information is also available from the INFORMATION_SCHEMA ENGINES table. See Section 28.3.13, “The INFORMATION_SCHEMA ENGINES Table”.