現在のFOREIGN_KEY_CHECKS値を確認します

5.1.5サーバーシステム変数を確認してください::Foreign_key_checks ：

mysql> SELECT @@GLOBAL.foreign_key_checks, @@SESSION.foreign_key_checks;
+-----------------------------+------------------------------+
| @@GLOBAL.foreign_key_checks | @@SESSION.foreign_key_checks |
+-----------------------------+------------------------------+
|                           1 |                            1 |
+-----------------------------+------------------------------+
1 row in set (0.01 sec)

更新

mysql> SELECT VERSION();
+-----------+
| VERSION() |
+-----------+
| 5.7.18    |
+-----------+
1 row in set (0.00 sec)

mysql> SELECT IF((SELECT `VARIABLE_VALUE`
    -> FROM `performance_schema`.`global_variables`
    -> WHERE `VARIABLE_NAME` = 'foreign_key_checks') = 'ON', 1, 0) `global.foreign_key_checks`,
    -> IF((SELECT `VARIABLE_VALUE`
    -> FROM `performance_schema`.`session_variables`
    -> WHERE `VARIABLE_NAME` = 'foreign_key_checks') = 'ON', 1, 0) `session.foreign_key_checks`;
+---------------------------+----------------------------+
| global.foreign_key_checks | session.foreign_key_checks |
+---------------------------+----------------------------+
|                         1 |                          1 |
+---------------------------+----------------------------+
1 row in set (0.00 sec)