SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES;
TABLE_ID	NAME	FLAG	N_COLS	SPACE
11	SYS_FOREIGN	0	7	0
12	SYS_FOREIGN_COLS	0	7	0
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES;
INDEX_ID	NAME	TABLE_ID	TYPE	N_FIELDS	PAGE_NO	SPACE
11	ID_IND	11	3	1	302	0
12	FOR_IND	11	0	1	303	0
13	REF_IND	11	0	1	304	0
14	ID_IND	12	3	2	305	0
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS;
TABLE_ID	NAME	POS	MTYPE	PRTYPE	LEN
11	ID	0	1	524292	0
11	FOR_NAME	1	1	524292	0
11	REF_NAME	2	1	524292	0
11	N_COLS	3	6	0	4
12	ID	0	1	524292	0
12	POS	1	6	0	4
12	FOR_COL_NAME	2	1	524292	0
12	REF_COL_NAME	3	1	524292	0
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FIELDS;
INDEX_ID	NAME	POS
11	ID	0
12	FOR_NAME	0
13	REF_NAME	0
14	ID	0
14	POS	1
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
ID	FOR_NAME	REF_NAME	N_COLS	TYPE
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
ID	FOR_COL_NAME	REF_COL_NAME	POS
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS;
TABLE_ID	NAME	STATS_INITIALIZED	NUM_ROWS	CLUST_INDEX_SIZE	OTHER_INDEX_SIZE	MODIFIED_COUNTER	AUTOINC	MYSQL_HANDLES_OPENED
11	SYS_FOREIGN	Uninitialized	0	0	0	0	0	0
12	SYS_FOREIGN_COLS	Uninitialized	0	0	0	0	0	0
CREATE TABLE parent (id INT NOT NULL,
PRIMARY KEY (id)) ENGINE=INNODB;
CREATE TABLE child (id INT, parent_id INT,
INDEX par_ind (parent_id),
CONSTRAINT constraint_test
FOREIGN KEY (parent_id) REFERENCES parent(id)
ON DELETE CASCADE) ENGINE=INNODB;
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
ID	FOR_NAME	REF_NAME	N_COLS	TYPE
test/constraint_test	test/child	test/parent	1	1
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
ID	FOR_COL_NAME	REF_COL_NAME	POS
test/constraint_test	parent_id	id	0
INSERT INTO parent VALUES(1);
SELECT name, num_rows, mysql_handles_opened
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
WHERE name LIKE "%parent";
name	num_rows	mysql_handles_opened
test/parent	1	1
SELECT NAME, FLAG, N_COLS, SPACE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES;
NAME	FLAG	N_COLS	SPACE
SYS_FOREIGN	0	7	0
SYS_FOREIGN_COLS	0	7	0
test/child	1	5	0
test/parent	1	4	0
SELECT name, n_fields
from INFORMATION_SCHEMA.INNODB_SYS_INDEXES
WHERE table_id In (SELECT table_id from
INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name LIKE "%parent%");
name	n_fields
PRIMARY	1
SELECT name, n_fields
from INFORMATION_SCHEMA.INNODB_SYS_INDEXES
WHERE table_id In (SELECT table_id from
INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name LIKE "%child%");
name	n_fields
GEN_CLUST_INDEX	0
par_ind	1
SELECT name, pos, mtype, len
from INFORMATION_SCHEMA.INNODB_SYS_COLUMNS
WHERE table_id In (SELECT table_id from
INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name LIKE "%child%");
name	pos	mtype	len
id	0	6	4
parent_id	1	6	4
DROP TABLE child;
DROP TABLE parent;
CREATE TABLE parent (id INT NOT NULL, newid INT NOT NULL,
PRIMARY KEY (id, newid)) ENGINE=INNODB;
CREATE TABLE child (id INT, parent_id INT,
INDEX par_ind (parent_id),
CONSTRAINT constraint_test
FOREIGN KEY (id, parent_id) REFERENCES parent(id, newid)
ON DELETE CASCADE) ENGINE=INNODB;
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
ID	FOR_NAME	REF_NAME	N_COLS	TYPE
test/constraint_test	test/child	test/parent	2	1
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
ID	FOR_COL_NAME	REF_COL_NAME	POS
test/constraint_test	id	id	0
test/constraint_test	parent_id	newid	1
INSERT INTO parent VALUES(1, 9);
SELECT * FROM parent WHERE id IN (SELECT id FROM parent);
id	newid
1	9
SELECT name, num_rows, mysql_handles_opened
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
WHERE name LIKE "%parent";
name	num_rows	mysql_handles_opened
test/parent	1	2
DROP TABLE child;
DROP TABLE parent;