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e581396b7a
Before commit6112853cdain MySQL 4.1.1 introduced the parameter innodb_file_per_table, all InnoDB data was written to the InnoDB system tablespace (often named ibdata1). A serious design problem is that once the system tablespace has grown to some size, it cannot shrink even if the data inside it has been deleted. There are also other design problems, such as the server hang MDEV-29930 that should only be possible when using innodb_file_per_table=0 and innodb_undo_tablespaces=0 (storing both tables and undo logs in the InnoDB system tablespace). The parameter innodb_change_buffering was deprecated in commitb5852ffbee. Starting with commitbaf276e6d4(MDEV-19229) the number of innodb_undo_tablespaces can be increased, so that the undo logs can be moved out of the system tablespace of an existing installation. If all these things (tables, undo logs, and the change buffer) are removed from the InnoDB system tablespace, the only variable-size data structure inside it is the InnoDB data dictionary. DDL operations on .ibd files was optimized in commit86dc7b4d4c(MDEV-24626). That should have removed any thinkable performance advantage of using innodb_file_per_table=0. Since there should be no benefit of setting innodb_file_per_table=0, the parameter should be deprecated. Starting with MySQL 5.6 and MariaDB Server 10.0, the default value is innodb_file_per_table=1.
94 lines
2.6 KiB
Text
94 lines
2.6 KiB
Text
create database bug_fk;
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use bug_fk;
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CREATE TABLE b (
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b int unsigned NOT NULL,
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d1 datetime NOT NULL,
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PRIMARY KEY (b,d1)
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) ENGINE=InnoDB;
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CREATE TABLE c (
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b int unsigned NOT NULL,
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d1 datetime NOT NULL,
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d2 datetime NOT NULL,
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PRIMARY KEY (b,d1),
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CONSTRAINT b_fk FOREIGN KEY (b) REFERENCES b (b)
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) ENGINE=InnoDB;
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show warnings;
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Level Code Message
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set foreign_key_checks = 0;
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DROP TABLE IF EXISTS b;
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show create table c;
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Table Create Table
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c CREATE TABLE `c` (
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`b` int(10) unsigned NOT NULL,
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`d1` datetime NOT NULL,
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`d2` datetime NOT NULL,
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PRIMARY KEY (`b`,`d1`),
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CONSTRAINT `b_fk` FOREIGN KEY (`b`) REFERENCES `b` (`b`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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CREATE TABLE b (
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b bigint unsigned NOT NULL,
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d1 date NOT NULL,
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PRIMARY KEY (b,d1)
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) ENGINE=InnoDB;
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DROP TABLE b;
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set foreign_key_checks = 1;
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CREATE TABLE b (
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b bigint unsigned NOT NULL,
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d1 date NOT NULL,
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PRIMARY KEY (b,d1)
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) ENGINE=InnoDB;
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ERROR HY000: Can't create table `bug_fk`.`b` (errno: 150 "Foreign key constraint is incorrectly formed")
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show warnings;
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Level Code Message
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Error 1005 Can't create table `bug_fk`.`b` (errno: 150 "Foreign key constraint is incorrectly formed")
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Warning 1215 Cannot add foreign key constraint for `b`
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set foreign_key_checks = 0;
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DROP TABLE IF EXISTS d;
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Warnings:
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Note 1051 Unknown table 'bug_fk.d'
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CREATE TABLE d (
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b bigint unsigned NOT NULL,
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d1 date NOT NULL,
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PRIMARY KEY (b,d1),
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CONSTRAINT bd_fk FOREIGN KEY (b) REFERENCES b (b)
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) ENGINE=InnoDB;
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show warnings;
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Level Code Message
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set foreign_key_checks = 1;
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show create table c;
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Table Create Table
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c CREATE TABLE `c` (
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`b` int(10) unsigned NOT NULL,
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`d1` datetime NOT NULL,
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`d2` datetime NOT NULL,
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PRIMARY KEY (`b`,`d1`),
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CONSTRAINT `b_fk` FOREIGN KEY (`b`) REFERENCES `b` (`b`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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show create table d;
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Table Create Table
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d CREATE TABLE `d` (
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`b` bigint(20) unsigned NOT NULL,
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`d1` date NOT NULL,
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PRIMARY KEY (`b`,`d1`),
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CONSTRAINT `bd_fk` FOREIGN KEY (`b`) REFERENCES `b` (`b`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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CREATE TABLE b (
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b bigint unsigned NOT NULL,
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d1 date NOT NULL,
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PRIMARY KEY (b,d1)
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) ENGINE=InnoDB;
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ERROR HY000: Can't create table `bug_fk`.`b` (errno: 150 "Foreign key constraint is incorrectly formed")
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show warnings;
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Level Code Message
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Error 1005 Can't create table `bug_fk`.`b` (errno: 150 "Foreign key constraint is incorrectly formed")
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Warning 1215 Cannot add foreign key constraint for `b`
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set foreign_key_checks=0;
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drop table c;
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drop table d;
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create table b(id int) engine=innodb;
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show warnings;
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Level Code Message
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b.frm
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b.ibd
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drop table b;
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drop database bug_fk;
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