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# Setup
create table parent (
pk int primary key,
id1 int unique,
id2 int unique,
ref1 int,
ref2 int,
constraint fk_p1 foreign key ref1_idx(ref1) references parent (id1),
foreign key ref2_idx(ref2) references parent (id2)
) engine ndb;
# Verify the foreign keys on parent
SHOW CREATE TABLE test.parent;
Table Create Table
parent CREATE TABLE `parent` (
`pk` int NOT NULL,
`id1` int DEFAULT NULL,
`id2` int DEFAULT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
UNIQUE KEY `id1` (`id1`),
UNIQUE KEY `id2` (`id2`),
KEY `fk_p1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `fk_p1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`),
CONSTRAINT `parent_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
create table child (
pk int primary key,
ref1 int,
ref2 int,
constraint fk_c1 foreign key ref1_idx(ref1) references parent (id1),
foreign key ref2_idx(ref2) references parent (id2)
) engine ndb;
# Verify the foreign keys on child
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `child_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`),
CONSTRAINT `fk_c1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
# Drop foreign keys one by one and verify the other FKs integrity
alter table parent
drop foreign key fk_p1,
algorithm = inplace;
# Verify the foreign keys on parent and child
SHOW CREATE TABLE test.parent;
Table Create Table
parent CREATE TABLE `parent` (
`pk` int NOT NULL,
`id1` int DEFAULT NULL,
`id2` int DEFAULT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
UNIQUE KEY `id1` (`id1`),
UNIQUE KEY `id2` (`id2`),
KEY `fk_p1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `parent_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `child_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`),
CONSTRAINT `fk_c1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
alter table parent
drop foreign key parent_fk_1,
algorithm = inplace;
# Verify the foreign keys on parent and child
SHOW CREATE TABLE test.parent;
Table Create Table
parent CREATE TABLE `parent` (
`pk` int NOT NULL,
`id1` int DEFAULT NULL,
`id2` int DEFAULT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
UNIQUE KEY `id1` (`id1`),
UNIQUE KEY `id2` (`id2`),
KEY `fk_p1` (`ref1`),
KEY `ref2_idx` (`ref2`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
No foreign keys found on table `test.parent`
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `child_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`),
CONSTRAINT `fk_c1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
alter table child
drop foreign key fk_c1,
algorithm = inplace;
# Verify the foreign keys on child
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `child_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
alter table child
drop foreign key child_fk_1,
algorithm = inplace;
# Verify the foreign keys on child
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
No foreign keys found on table `test.child`
# Cleanup
drop table child, parent;
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