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5407117a59
The InnoDB internal tables SYS_TABLESPACES and SYS_DATAFILES as well as the INFORMATION_SCHEMA views INNODB_SYS_TABLESPACES and INNODB_SYS_DATAFILES were introduced in MySQL 5.6 for no good reason in mysql/mysql-server/commit/e9255a22ef16d612a8076bc0b34002bc5a784627 when the InnoDB support for the DATA DIRECTORY attribute was introduced. The file system should be the authoritative source of information on files. Storing information about file system paths in the file system (symlinks, or even the .isl files that were unfortunately chosen as the solution) is sufficient. If information is additionally stored in some hidden tables inside the InnoDB system tablespace, everything unnecessarily becomes more complicated, because more copies of data mean more opportunity for the copies to be out of sync, and because modifying the data in the system tablespace in the desired way might not be possible at all without modifying the InnoDB source code. So, the copy in the system tablespace basically is a redundant, non-authoritative source of information. We will stop creating or accessing the system tables SYS_TABLESPACES and SYS_DATAFILES. We will also remove the view INFORMATION_SCHEMA.INNODB_SYS_DATAFILES along with SYS_DATAFILES. The view INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES will be repurposed to directly reflect fil_system.space_list. The column PAGE_SIZE, which would always contain the value of the GLOBAL read-only variable innodb_page_size, is removed. The column ZIP_PAGE_SIZE, which would actually contain the physical page size of a page, is renamed to PAGE_SIZE. Finally, a new column FILENAME is added, as a replacement of SYS_DATAFILES.PATH. This will also address MDEV-21801 (files that were created before upgrading to MySQL 5.6 or MariaDB 10.0 or later were never registered in SYS_TABLESPACES or SYS_DATAFILES) and MDEV-21801 (information about the system tablespace is not stored in SYS_TABLESPACES or SYS_DATAFILES).
611 lines
23 KiB
Plaintext
611 lines
23 KiB
Plaintext
CREATE TABLE parent (a INT PRIMARY KEY, b INT NOT NULL) ENGINE = InnoDB;
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INSERT INTO parent VALUES(1,2),(2,3);
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CREATE INDEX tb ON parent(b);
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INSERT INTO parent VALUES(10,20),(20,30);
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CREATE TABLE child (a1 INT PRIMARY KEY, a2 INT) ENGINE = InnoDB;
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CREATE INDEX tb ON child(a2);
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INSERT INTO child VALUES(10,20);
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ALTER TABLE child ADD FOREIGN KEY(a2) REFERENCES parent(b),
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ALGORITHM = INPLACE;
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ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Adding foreign keys needs foreign_key_checks=OFF. Try ALGORITHM=COPY
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SET foreign_key_checks = 0;
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ALTER TABLE child ADD CONSTRAINT fk_1 FOREIGN KEY (a2)
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REFERENCES parent(b) ON DELETE SET NULL ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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ALTER TABLE child ADD CONSTRAINT fk_1 FOREIGN KEY (a2)
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REFERENCES parent(b) ON DELETE SET NULL ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Duplicate FOREIGN KEY constraint name 'test/fk_1'
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SET foreign_key_checks = 1;
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INSERT INTO child VALUES(1,2),(2,3);
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INSERT INTO child VALUES(4,4);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fk_1` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE)
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SELECT * FROM parent;
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a b
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1 2
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2 3
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10 20
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20 30
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SET foreign_key_checks = 0;
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ALTER TABLE child ADD CONSTRAINT fk_20 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'fk_20' in the referenced table 'parent'
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SHOW WARNINGS;
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Level Code Message
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Error 1822 Failed to add the foreign key constaint. Missing index for constraint 'fk_20' in the referenced table 'parent'
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SHOW ERRORS;
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Level Code Message
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Error 1822 Failed to add the foreign key constaint. Missing index for constraint 'fk_20' in the referenced table 'parent'
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CREATE INDEX idx1 on parent(a, b);
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ALTER TABLE child ADD CONSTRAINT fk_10 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ALTER TABLE child ADD CONSTRAINT fk_2 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE, ADD INDEX idx1(a1,a2),
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ALGORITHM = INPLACE;
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ALTER TABLE child ADD CONSTRAINT fk_3 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE;
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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test/fk_10 test/child test/parent 2 5
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test/fk_2 test/child test/parent 2 5
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test/fk_3 test/child test/parent 2 5
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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test/fk_10 a1 a 0
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test/fk_10 a2 b 1
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test/fk_2 a1 a 0
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test/fk_2 a2 b 1
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test/fk_3 a1 a 0
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test/fk_3 a2 b 1
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SET foreign_key_checks = 1;
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INSERT INTO child VALUES(5,4);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fk_1` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE)
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SHOW CREATE TABLE child;
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Table Create Table
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child CREATE TABLE `child` (
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`a1` int(11) NOT NULL,
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`a2` int(11) DEFAULT NULL,
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PRIMARY KEY (`a1`),
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KEY `tb` (`a2`),
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KEY `idx1` (`a1`,`a2`),
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CONSTRAINT `fk_1` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE,
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CONSTRAINT `fk_10` FOREIGN KEY (`a1`, `a2`) REFERENCES `parent` (`a`, `b`) ON DELETE CASCADE ON UPDATE CASCADE,
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CONSTRAINT `fk_2` FOREIGN KEY (`a1`, `a2`) REFERENCES `parent` (`a`, `b`) ON DELETE CASCADE ON UPDATE CASCADE,
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CONSTRAINT `fk_3` FOREIGN KEY (`a1`, `a2`) REFERENCES `parent` (`a`, `b`) ON DELETE CASCADE ON UPDATE CASCADE
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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DELETE FROM parent where a = 1;
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SELECT * FROM child;
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a1 a2
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1 NULL
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2 3
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10 20
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SET foreign_key_checks = 0;
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SET @saved_debug_dbug = @@SESSION.debug_dbug;
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SET DEBUG_DBUG = '+d,innodb_test_open_ref_fail';
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ALTER TABLE child ADD CONSTRAINT fk_4 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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SET DEBUG_DBUG = @saved_debug_dbug;
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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test/fk_10 test/child test/parent 2 5
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test/fk_2 test/child test/parent 2 5
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test/fk_3 test/child test/parent 2 5
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test/fk_4 test/child test/parent 2 5
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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test/fk_10 a1 a 0
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test/fk_10 a2 b 1
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test/fk_2 a1 a 0
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test/fk_2 a2 b 1
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test/fk_3 a1 a 0
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test/fk_3 a2 b 1
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test/fk_4 a1 a 0
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test/fk_4 a2 b 1
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SELECT t2.name, t1.name FROM information_schema.innodb_sys_columns t1, information_schema.innodb_sys_tables t2 WHERE t1.table_id = t2.table_id AND t2.name LIKE "%child" ORDER BY t1.name;
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name name
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test/child a1
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test/child a2
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SELECT NAME FROM information_schema.INNODB_SYS_TABLES;
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NAME
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SYS_FOREIGN
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SYS_FOREIGN_COLS
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SYS_VIRTUAL
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mysql/innodb_index_stats
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mysql/innodb_table_stats
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mysql/transaction_registry
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test/child
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test/parent
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INSERT INTO child VALUES(5,4);
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SET foreign_key_checks = 1;
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INSERT INTO child VALUES(6,5);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fk_1` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE)
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SET foreign_key_checks = 0;
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CREATE TABLE `#parent` (a INT PRIMARY KEY, b INT NOT NULL) ENGINE = InnoDB;
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CREATE INDEX tb ON `#parent`(a, b);
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CREATE TABLE `#child` (a1 INT PRIMARY KEY, a2 INT) ENGINE = InnoDB;
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CREATE INDEX tb ON `#child`(a1, a2);
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SET DEBUG_DBUG = '+d,innodb_test_no_foreign_idx';
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ALTER TABLE `#child` ADD CONSTRAINT fk_40 FOREIGN KEY (a1, a2)
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REFERENCES `#parent`(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'fk_40' in the foreign table '#child'
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SET DEBUG_DBUG = @saved_debug_dbug;
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SHOW ERRORS;
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Level Code Message
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Error 1821 Failed to add the foreign key constaint. Missing index for constraint 'fk_40' in the foreign table '#child'
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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test/fk_10 test/child test/parent 2 5
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test/fk_2 test/child test/parent 2 5
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test/fk_3 test/child test/parent 2 5
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test/fk_4 test/child test/parent 2 5
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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test/fk_10 a1 a 0
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test/fk_10 a2 b 1
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test/fk_2 a1 a 0
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test/fk_2 a2 b 1
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test/fk_3 a1 a 0
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test/fk_3 a2 b 1
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test/fk_4 a1 a 0
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test/fk_4 a2 b 1
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SET DEBUG_DBUG = '+d,innodb_test_no_reference_idx';
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ALTER TABLE child ADD CONSTRAINT fk_42 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'fk_42' in the referenced table 'parent'
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SET DEBUG_DBUG = @saved_debug_dbug;
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SHOW ERRORS;
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Level Code Message
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Error 1822 Failed to add the foreign key constaint. Missing index for constraint 'fk_42' in the referenced table 'parent'
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SET DEBUG_DBUG = '+d,innodb_test_wrong_fk_option';
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ALTER TABLE child ADD CONSTRAINT fk_42 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Failed to add the foreign key constraint on table 'child'. Incorrect options in FOREIGN KEY constraint 'test/fk_42'
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SET DEBUG_DBUG = @saved_debug_dbug;
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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test/fk_10 test/child test/parent 2 5
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test/fk_2 test/child test/parent 2 5
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test/fk_3 test/child test/parent 2 5
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test/fk_4 test/child test/parent 2 5
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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test/fk_10 a1 a 0
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test/fk_10 a2 b 1
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test/fk_2 a1 a 0
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test/fk_2 a2 b 1
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test/fk_3 a1 a 0
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test/fk_3 a2 b 1
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test/fk_4 a1 a 0
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test/fk_4 a2 b 1
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SET DEBUG_DBUG = '+d,innodb_test_cannot_add_fk_system';
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ALTER TABLE `#child` ADD CONSTRAINT fk_43 FOREIGN KEY (a1, a2)
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REFERENCES `#parent`(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Failed to add the foreign key constraint 'test/fk_43' to system tables
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SET DEBUG_DBUG = @saved_debug_dbug;
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SHOW ERRORS;
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Level Code Message
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Error 1823 Failed to add the foreign key constraint 'test/fk_43' to system tables
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DROP TABLE `#child`;
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DROP TABLE `#parent`;
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SET foreign_key_checks = 0;
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ALTER TABLE child ADD CONSTRAINT fk_5 FOREIGN KEY (a2) REFERENCES parent(b)
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ON DELETE SET NULL ON UPDATE CASCADE,
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ADD CONSTRAINT fk_6 FOREIGN KEY (a1, a2)
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REFERENCES parent(a, b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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test/fk_10 test/child test/parent 2 5
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test/fk_2 test/child test/parent 2 5
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test/fk_3 test/child test/parent 2 5
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test/fk_4 test/child test/parent 2 5
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test/fk_5 test/child test/parent 1 6
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test/fk_6 test/child test/parent 2 5
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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test/fk_10 a1 a 0
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test/fk_10 a2 b 1
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test/fk_2 a1 a 0
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test/fk_2 a2 b 1
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test/fk_3 a1 a 0
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test/fk_3 a2 b 1
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test/fk_4 a1 a 0
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test/fk_4 a2 b 1
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test/fk_5 a2 b 0
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test/fk_6 a1 a 0
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test/fk_6 a2 b 1
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DROP TABLE child;
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DROP TABLE parent;
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CREATE TABLE parent (a INT PRIMARY KEY, b INT NOT NULL) ENGINE = InnoDB;
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INSERT INTO parent VALUES(1,2),(2,3);
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CREATE INDEX tb ON parent(b);
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INSERT INTO parent VALUES(10,20),(20,30);
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CREATE TABLE child (a1 INT PRIMARY KEY, a2 INT) ENGINE = InnoDB;
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CREATE INDEX tb ON child(a2);
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INSERT INTO child VALUES(10,20);
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SET foreign_key_checks = 0;
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ALTER TABLE child DROP INDEX tb, ADD CONSTRAINT fk_4 FOREIGN KEY (a2)
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REFERENCES parent(b) ON DELETE CASCADE ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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SHOW CREATE TABLE child;
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Table Create Table
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child CREATE TABLE `child` (
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`a1` int(11) NOT NULL,
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`a2` int(11) DEFAULT NULL,
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PRIMARY KEY (`a1`),
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KEY `fk_4` (`a2`),
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CONSTRAINT `fk_4` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE CASCADE ON UPDATE CASCADE
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_4 test/child test/parent 1 5
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SELECT * FROM information_schema.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_4 a2 b 0
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SET foreign_key_checks = 1;
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DROP TABLE child;
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DROP TABLE parent;
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CREATE TABLE parent (a INT PRIMARY KEY, b INT NOT NULL) ENGINE = InnoDB;
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INSERT INTO parent VALUES(1,2),(2,3);
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CREATE INDEX tb ON parent(b);
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INSERT INTO parent VALUES(10,20),(20,30);
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CREATE TABLE child (a1 INT PRIMARY KEY, a2 INT) ENGINE = InnoDB;
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CREATE INDEX tb ON child(a2);
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SET foreign_key_checks = 0;
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ALTER TABLE child CHANGE a2 a3 INT,
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ADD CONSTRAINT fk_1 FOREIGN KEY (a2) REFERENCES parent(b)
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ON DELETE SET NULL ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR 42000: Key column 'a2' doesn't exist in table
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ALTER TABLE child CHANGE a2 a3 INT,
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ADD CONSTRAINT fk_1 FOREIGN KEY (a3) REFERENCES parent(b)
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ON DELETE SET NULL ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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DROP TABLE child;
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DROP TABLE parent;
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CREATE TABLE parent (a INT PRIMARY KEY, b INT NOT NULL) ENGINE = InnoDB;
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INSERT INTO parent VALUES(1,2),(2,3);
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CREATE INDEX tb ON parent(b);
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INSERT INTO parent VALUES(10,20),(20,30);
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CREATE TABLE child (a1 INT NOT NULL, a2 INT) ENGINE = InnoDB;
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CREATE INDEX tb ON child(a2);
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SET foreign_key_checks = 0;
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SET DEBUG_DBUG = '+d,innodb_test_cannot_add_fk_system';
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ALTER TABLE child ADD PRIMARY KEY idx (a3), CHANGE a1 a3 INT,
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ADD CONSTRAINT fk_1 FOREIGN KEY (a2) REFERENCES parent(b)
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ON DELETE SET NULL ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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ERROR HY000: Failed to add the foreign key constraint 'test/fk_1' to system tables
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SET DEBUG_DBUG = @saved_debug_dbug;
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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SELECT t2.name, t1.name FROM information_schema.innodb_sys_columns t1, information_schema.innodb_sys_tables t2 WHERE t1.table_id = t2.table_id AND t2.name LIKE "%child" ORDER BY t1.name;
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name name
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test/child a1
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test/child a2
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SELECT NAME FROM information_schema.INNODB_SYS_TABLES;
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NAME
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SYS_FOREIGN
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SYS_FOREIGN_COLS
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SYS_VIRTUAL
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mysql/innodb_index_stats
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mysql/innodb_table_stats
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mysql/transaction_registry
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test/child
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test/parent
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ALTER TABLE child ADD PRIMARY KEY idx (a3), CHANGE a1 a3 INT,
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ADD CONSTRAINT fk_1 FOREIGN KEY (a2) REFERENCES parent(b)
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ON DELETE SET NULL ON UPDATE CASCADE,
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ALGORITHM = INPLACE;
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Warnings:
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Warning 1280 Name 'idx' ignored for PRIMARY key.
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/fk_1 test/child test/parent 1 6
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/fk_1 a2 b 0
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SELECT t2.name, t1.name FROM information_schema.innodb_sys_columns t1, information_schema.innodb_sys_tables t2 WHERE t1.table_id = t2.table_id AND t2.name LIKE "%child" ORDER BY t1.name;
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name name
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test/child a2
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test/child a3
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SELECT NAME FROM information_schema.INNODB_SYS_TABLES;
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NAME
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SYS_FOREIGN
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SYS_FOREIGN_COLS
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SYS_VIRTUAL
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mysql/innodb_index_stats
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mysql/innodb_table_stats
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mysql/transaction_registry
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test/child
|
|
test/parent
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a3` int(11) NOT NULL,
|
|
`a2` int(11) DEFAULT NULL,
|
|
PRIMARY KEY (`a3`),
|
|
KEY `tb` (`a2`),
|
|
CONSTRAINT `fk_1` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
DROP TABLE child;
|
|
CREATE TABLE child (a1 INT NOT NULL, a2 INT) ENGINE = InnoDB;
|
|
ALTER TABLE child ADD PRIMARY KEY idx (a1),
|
|
ADD CONSTRAINT fk_1 FOREIGN KEY (a2) REFERENCES parent(b)
|
|
ON DELETE SET NULL ON UPDATE CASCADE,
|
|
ALGORITHM = INPLACE;
|
|
Warnings:
|
|
Warning 1280 Name 'idx' ignored for PRIMARY key.
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/fk_1 test/child test/parent 1 6
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/fk_1 a2 b 0
|
|
SELECT t2.name, t1.name FROM information_schema.innodb_sys_columns t1, information_schema.innodb_sys_tables t2 WHERE t1.table_id = t2.table_id AND t2.name LIKE "%child" ORDER BY t1.name;
|
|
name name
|
|
test/child a1
|
|
test/child a2
|
|
SELECT NAME FROM information_schema.INNODB_SYS_TABLES;
|
|
NAME
|
|
SYS_FOREIGN
|
|
SYS_FOREIGN_COLS
|
|
SYS_VIRTUAL
|
|
mysql/innodb_index_stats
|
|
mysql/innodb_table_stats
|
|
mysql/transaction_registry
|
|
test/child
|
|
test/parent
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a1` int(11) NOT NULL,
|
|
`a2` int(11) DEFAULT NULL,
|
|
PRIMARY KEY (`a1`),
|
|
KEY `fk_1` (`a2`),
|
|
CONSTRAINT `fk_1` FOREIGN KEY (`a2`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
DROP TABLE child;
|
|
CREATE TABLE child (a1 INT NOT NULL, a2 INT) ENGINE = InnoDB;
|
|
ALTER TABLE child CHANGE a1 a3 INT,
|
|
ADD CONSTRAINT fk_1 FOREIGN KEY (a3) REFERENCES parent(b)
|
|
ON DELETE SET NULL ON UPDATE CASCADE,
|
|
ALGORITHM = INPLACE;
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/fk_1 test/child test/parent 1 6
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/fk_1 a3 b 0
|
|
SELECT t2.name, t1.name FROM information_schema.innodb_sys_columns t1, information_schema.innodb_sys_tables t2 WHERE t1.table_id = t2.table_id AND t2.name LIKE "%child" ORDER BY t1.name;
|
|
name name
|
|
test/child a2
|
|
test/child a3
|
|
SELECT NAME FROM information_schema.INNODB_SYS_TABLES;
|
|
NAME
|
|
SYS_FOREIGN
|
|
SYS_FOREIGN_COLS
|
|
SYS_VIRTUAL
|
|
mysql/innodb_index_stats
|
|
mysql/innodb_table_stats
|
|
mysql/transaction_registry
|
|
test/child
|
|
test/parent
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a3` int(11) DEFAULT NULL,
|
|
`a2` int(11) DEFAULT NULL,
|
|
KEY `fk_1` (`a3`),
|
|
CONSTRAINT `fk_1` FOREIGN KEY (`a3`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
DROP TABLE child;
|
|
CREATE TABLE child (a1 INT NOT NULL, a2 INT) ENGINE = InnoDB;
|
|
ALTER TABLE child ADD PRIMARY KEY idx (a3), CHANGE a1 a3 INT,
|
|
ADD CONSTRAINT fk_1 FOREIGN KEY (a3) REFERENCES parent(b)
|
|
ON DELETE SET NULL ON UPDATE CASCADE,
|
|
ALGORITHM = INPLACE;
|
|
ERROR HY000: Failed to add the foreign key constraint on table 'child'. Incorrect options in FOREIGN KEY constraint 'test/fk_1'
|
|
DROP TABLE parent;
|
|
DROP TABLE child;
|
|
CREATE TABLE parent (a INT PRIMARY KEY, b INT NOT NULL, c INT) ENGINE = InnoDB;
|
|
INSERT INTO parent VALUES(1,2,3),(2,3,4);
|
|
CREATE INDEX tb ON parent(b);
|
|
CREATE TABLE child (a1 INT NOT NULL, a2 INT, a3 INT) ENGINE = InnoDB;
|
|
CREATE INDEX tb ON child(a2);
|
|
ALTER TABLE child
|
|
ADD CONSTRAINT fk_a FOREIGN KEY (a2) REFERENCES parent(b)
|
|
ON DELETE SET NULL ON UPDATE CASCADE,
|
|
ALGORITHM = INPLACE;
|
|
ALTER TABLE child
|
|
ADD CONSTRAINT fk_b FOREIGN KEY (a1) REFERENCES parent(a),
|
|
ALGORITHM = INPLACE;
|
|
ALTER TABLE child CHANGE a2 a2_new INT, CHANGE a1 a1_new INT;
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a1_new` int(11) DEFAULT NULL,
|
|
`a2_new` int(11) DEFAULT NULL,
|
|
`a3` int(11) DEFAULT NULL,
|
|
KEY `tb` (`a2_new`),
|
|
KEY `fk_b` (`a1_new`),
|
|
CONSTRAINT `fk_a` FOREIGN KEY (`a2_new`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE,
|
|
CONSTRAINT `fk_b` FOREIGN KEY (`a1_new`) REFERENCES `parent` (`a`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/fk_a test/child test/parent 1 6
|
|
test/fk_b test/child test/parent 1 0
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/fk_a a2_new b 0
|
|
test/fk_b a1_new a 0
|
|
ALTER TABLE child
|
|
ADD CONSTRAINT fk_new_1 FOREIGN KEY (a1_new) REFERENCES parent(b),
|
|
ADD CONSTRAINT fk_new_2 FOREIGN KEY (a2_new) REFERENCES parent(a),
|
|
ADD CONSTRAINT fk_new_3 FOREIGN KEY (a3) REFERENCES parent(c),
|
|
ALGORITHM = INPLACE;
|
|
ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'fk_new_3' in the referenced table 'parent'
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a1_new` int(11) DEFAULT NULL,
|
|
`a2_new` int(11) DEFAULT NULL,
|
|
`a3` int(11) DEFAULT NULL,
|
|
KEY `tb` (`a2_new`),
|
|
KEY `fk_b` (`a1_new`),
|
|
CONSTRAINT `fk_a` FOREIGN KEY (`a2_new`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE,
|
|
CONSTRAINT `fk_b` FOREIGN KEY (`a1_new`) REFERENCES `parent` (`a`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/fk_a test/child test/parent 1 6
|
|
test/fk_b test/child test/parent 1 0
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/fk_a a2_new b 0
|
|
test/fk_b a1_new a 0
|
|
ALTER TABLE child
|
|
ADD CONSTRAINT fk_new_1 FOREIGN KEY (a1_new) REFERENCES parent(b),
|
|
ADD CONSTRAINT fk_new_2 FOREIGN KEY (a2_new) REFERENCES parent(a),
|
|
ADD CONSTRAINT fk_new_3 FOREIGN KEY (a3) REFERENCES parent(a),
|
|
ALGORITHM = INPLACE;
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a1_new` int(11) DEFAULT NULL,
|
|
`a2_new` int(11) DEFAULT NULL,
|
|
`a3` int(11) DEFAULT NULL,
|
|
KEY `tb` (`a2_new`),
|
|
KEY `fk_new_1` (`a1_new`),
|
|
KEY `fk_new_3` (`a3`),
|
|
CONSTRAINT `fk_a` FOREIGN KEY (`a2_new`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE CASCADE,
|
|
CONSTRAINT `fk_b` FOREIGN KEY (`a1_new`) REFERENCES `parent` (`a`),
|
|
CONSTRAINT `fk_new_1` FOREIGN KEY (`a1_new`) REFERENCES `parent` (`b`),
|
|
CONSTRAINT `fk_new_2` FOREIGN KEY (`a2_new`) REFERENCES `parent` (`a`),
|
|
CONSTRAINT `fk_new_3` FOREIGN KEY (`a3`) REFERENCES `parent` (`a`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/fk_a test/child test/parent 1 6
|
|
test/fk_b test/child test/parent 1 0
|
|
test/fk_new_1 test/child test/parent 1 0
|
|
test/fk_new_2 test/child test/parent 1 0
|
|
test/fk_new_3 test/child test/parent 1 0
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/fk_a a2_new b 0
|
|
test/fk_b a1_new a 0
|
|
test/fk_new_1 a1_new b 0
|
|
test/fk_new_2 a2_new a 0
|
|
test/fk_new_3 a3 a 0
|
|
DROP TABLE child;
|
|
CREATE TABLE child (a1 INT NOT NULL, a2 INT, a3 INT) ENGINE = InnoDB;
|
|
CREATE INDEX tb ON child(a2);
|
|
ALTER TABLE child ADD PRIMARY KEY idx (a1),
|
|
ADD CONSTRAINT fk_new_1 FOREIGN KEY (a1) REFERENCES parent(b),
|
|
ADD CONSTRAINT fk_new_2 FOREIGN KEY (a2) REFERENCES parent(a),
|
|
ADD CONSTRAINT fk_new_3 FOREIGN KEY (a3) REFERENCES parent(c),
|
|
ALGORITHM = INPLACE;
|
|
ERROR HY000: Failed to add the foreign key constaint. Missing index for constraint 'fk_new_3' in the referenced table 'parent'
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a1` int(11) NOT NULL,
|
|
`a2` int(11) DEFAULT NULL,
|
|
`a3` int(11) DEFAULT NULL,
|
|
KEY `tb` (`a2`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
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
|
|
ALTER TABLE child ADD PRIMARY KEY idx (a1),
|
|
ADD CONSTRAINT fk_new_1 FOREIGN KEY (a1) REFERENCES parent(b),
|
|
ADD CONSTRAINT fk_new_2 FOREIGN KEY (a2) REFERENCES parent(a),
|
|
ADD CONSTRAINT fk_new_3 FOREIGN KEY (a3) REFERENCES parent(a),
|
|
ALGORITHM = INPLACE;
|
|
Warnings:
|
|
Warning 1280 Name 'idx' ignored for PRIMARY key.
|
|
SHOW CREATE TABLE child;
|
|
Table Create Table
|
|
child CREATE TABLE `child` (
|
|
`a1` int(11) NOT NULL,
|
|
`a2` int(11) DEFAULT NULL,
|
|
`a3` int(11) DEFAULT NULL,
|
|
PRIMARY KEY (`a1`),
|
|
KEY `tb` (`a2`),
|
|
KEY `fk_new_3` (`a3`),
|
|
CONSTRAINT `fk_new_1` FOREIGN KEY (`a1`) REFERENCES `parent` (`b`),
|
|
CONSTRAINT `fk_new_2` FOREIGN KEY (`a2`) REFERENCES `parent` (`a`),
|
|
CONSTRAINT `fk_new_3` FOREIGN KEY (`a3`) REFERENCES `parent` (`a`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=latin1
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/fk_new_1 test/child test/parent 1 0
|
|
test/fk_new_2 test/child test/parent 1 0
|
|
test/fk_new_3 test/child test/parent 1 0
|
|
SELECT * from information_schema.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/fk_new_1 a1 b 0
|
|
test/fk_new_2 a2 a 0
|
|
test/fk_new_3 a3 a 0
|
|
SET foreign_key_checks = 1;
|
|
DROP TABLE child;
|
|
DROP TABLE parent;
|
|
CREATE TABLE Parent (a INT PRIMARY KEY, b INT NOT NULL) ENGINE = InnoDB;
|
|
INSERT INTO Parent VALUES(1,2),(2,3);
|
|
CREATE INDEX tb ON Parent(b);
|
|
INSERT INTO Parent VALUES(10,20),(20,30);
|
|
CREATE TABLE Child (a1 INT PRIMARY KEY, a2 INT) ENGINE = InnoDB;
|
|
CREATE INDEX tb ON Child(a2);
|
|
INSERT INTO Child VALUES(10,20);
|
|
SET foreign_key_checks = 0;
|
|
ALTER TABLE Child ADD CONSTRAINT fk_1 FOREIGN KEY (a2)
|
|
REFERENCES Parent(b) ON DELETE SET NULL ON UPDATE CASCADE,
|
|
ALGORITHM = INPLACE;
|
|
DROP TABLE Child;
|
|
DROP TABLE Parent;
|
|
CREATE TABLE `t2`(a int,c int,d int) ENGINE=INNODB;
|
|
CREATE TABLE `t3`(a int,c int,d int) ENGINE=INNODB;
|
|
CREATE INDEX idx ON t3(a);
|
|
ALTER TABLE `t2` ADD CONSTRAINT `fw` FOREIGN KEY (`c`) REFERENCES t3 (a);
|
|
ALTER TABLE `t2` ADD CONSTRAINT `e` foreign key (`d`) REFERENCES t3(a);
|
|
ALTER TABLE `t3` ADD CONSTRAINT `e` foreign key (`c`) REFERENCES `t2`(`c`) ON UPDATE SET NULL;
|
|
ERROR HY000: Failed to add the foreign key constraint 'test/e' to system tables
|
|
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
|
|
ID FOR_NAME REF_NAME N_COLS TYPE
|
|
test/e test/t2 test/t3 1 0
|
|
test/fw test/t2 test/t3 1 0
|
|
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
|
|
ID FOR_COL_NAME REF_COL_NAME POS
|
|
test/e d a 0
|
|
test/fw c a 0
|
|
DROP TABLE t2;
|
|
DROP TABLE t3;
|