MySQL 8.4 Release Notes
28.3.13 INFORMATION_SCHEMA ENGINES 表
The ENGINES table provides information about storage engines. This is particularly useful for checking whether a storage engine is supported, or to see what the default engine is.
The ENGINES table has these columns:
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ENGINEThe name of the storage engine.
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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.
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TRANSACTIONSWhether the storage engine supports transactions.
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XAWhether the storage engine supports XA transactions.
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SAVEPOINTSWhether the storage engine supports savepoints.
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ENGINESis a nonstandardINFORMATION_SCHEMAtable.
Storage engine information is also available from the SHOW ENGINES statement. See Section 15.7.7.17, “SHOW ENGINES Statement”. The following statements are equivalent:
SELECT * FROM INFORMATION_SCHEMA.ENGINES
SHOW ENGINES