CREATE TABLE parent (
id INT PRIMARY KEY,
KEY (id)
) ENGINE=InnoDB;
CREATE TABLE child (
id INT PRIMARY KEY,
parent_id INT,
FOREIGN KEY (parent_id) 
REFERENCES parent(id)
) ENGINE=InnoDB;
INSERT INTO parent VALUES (1), (2);
INSERT INTO child VALUES (1,1);
connection node_1;
SET AUTOCOMMIT = OFF;
START TRANSACTION;
DELETE FROM parent WHERE id = 2;
connection node_2;
SET AUTOCOMMIT = OFF;
START TRANSACTION;
INSERT INTO child VALUES (2, 2);
connection node_1;
COMMIT;
connection node_2;
COMMIT;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
DROP TABLE child;
DROP TABLE parent;