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:
ENGINE
The name of the storage engine.
SUPPORT
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 engineNO
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 should contain a reason indicating why the option is disabled. See Section 7.4.2, “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. For theengine_name
NDB
storage engine,DISABLED
means the server was compiled with support for NDB Cluster, but was not started with the--ndbcluster
option.All MySQL servers support
MyISAM
tables. It is not possible to disableMyISAM
.COMMENT
A brief description of the storage engine.
TRANSACTIONS
Whether the storage engine supports transactions.
XA
Whether the storage engine supports XA transactions.
SAVEPOINTS
Whether the storage engine supports savepoints.
Notes
ENGINES
is a nonstandardINFORMATION_SCHEMA
table.
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