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. SHOW TABLE TYPES
is a deprecated synonym.
The information_schema.ENGINES
table provides the same information.
Since storage engines are plugins, different information about them is also shown in the information_schema.PLUGINS
table and by the SHOW PLUGINS
statement.
Note that both MySQL's InnoDB and Percona's XtraDB replacement are labeled as InnoDB
. However, if XtraDB is in use, it will be specified in the COMMENT
field. See XtraDB and InnoDB. The same applies to FederatedX.
The output consists of the following columns:
Engine
indicates the engine's name. Support
indicates whether the engine is installed, and whether it is the default engine for the current session. Comment
is a brief description. Transactions
, XA
and Savepoints
indicate whether transactions, XA transactions and transaction savepoints are supported by the engine. SHOW ENGINES\G *************************** 1. row *************************** Engine: InnoDB Support: DEFAULT Comment: Supports transactions, row-level locking, and foreign keys Transactions: YES XA: YES Savepoints: YES *************************** 2. row *************************** Engine: CSV Support: YES Comment: CSV storage engine Transactions: NO XA: NO Savepoints: NO *************************** 3. row *************************** Engine: MyISAM Support: YES Comment: MyISAM storage engine Transactions: NO XA: NO Savepoints: NO *************************** 4. row *************************** Engine: BLACKHOLE Support: YES Comment: /dev/null storage engine (anything you write to it disappears) Transactions: NO XA: NO Savepoints: NO *************************** 5. row *************************** Engine: FEDERATED Support: YES Comment: FederatedX pluggable storage engine Transactions: YES XA: NO Savepoints: YES *************************** 6. row *************************** Engine: MRG_MyISAM Support: YES Comment: Collection of identical MyISAM tables Transactions: NO XA: NO Savepoints: NO *************************** 7. row *************************** Engine: ARCHIVE Support: YES Comment: Archive storage engine Transactions: NO XA: NO Savepoints: NO *************************** 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: PERFORMANCE_SCHEMA Support: YES Comment: Performance Schema Transactions: NO XA: NO Savepoints: NO *************************** 10. row *************************** Engine: Aria Support: YES Comment: Crash-safe tables with MyISAM heritage Transactions: NO XA: NO Savepoints: NO 10 rows in set (0.00 sec)
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https://mariadb.com/kb/en/show-engines/