The INNODB_SYS_FOREIGN table provides status
information about InnoDB
foreign keys, equivalent
to the information from the SYS_FOREIGN table
in the InnoDB data dictionary.
Table 20.11. INNODB_SYS_FOREIGN Columns
| Column name | Description |
|---|---|
ID | The name (not a numeric value) of the foreign key index. Preceded by the
database name, for example,
test/products_fk. |
FOR_NAME | The name of the child table in this foreign key relationship. |
REF_NAME | The name of the parent table in this foreign key relationship. |
N_COLS | The number of columns in the foreign key index. |
TYPE | A collection of bit flags with information about the foreign key column,
ORed together. 1 = ON DELETE CASCADE, 2
= ON UPDATE SET NULL, 4 = ON
UPDATE CASCADE, 8 = ON UPDATE
SET NULL, 16 = ON DELETE NO
ACTION, 32 = ON UPDATE NO ACTION. |
Notes:
Since the INFORMATION_SCHEMA is a
general-purpose way to monitor the MySQL server, use this
table rather than the corresponding InnoDB
system table for any new monitoring application you develop.
You must have the PROCESS privilege to
query this table.
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