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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).
29 lines
1.1 KiB
Plaintext
29 lines
1.1 KiB
Plaintext
CREATE DATABASE test_jfg;
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CREATE DATABASE test_jfg2;
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CREATE TABLE test_jfg.test (a int unsigned PRIMARY KEY) ENGINE=InnoDB;
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RENAME TABLE test_jfg.test TO test_jfg2.test;
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SELECT REPLACE(filename,'\\','/') path
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FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE filename LIKE '%test%';
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path
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./test_jfg2/test.ibd
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DROP DATABASE test_jfg;
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# restart
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DROP DATABASE test_jfg2;
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CREATE DATABASE abc_def;
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CREATE DATABASE abc_def2;
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CREATE TABLE abc_def.test (a int unsigned PRIMARY KEY) ENGINE=InnoDB;
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RENAME TABLE abc_def.test TO abc_def2.test1;
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SELECT REPLACE(filename,'\\','/') path
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FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE filename LIKE '%test%';
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path
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./abc_def2/test1.ibd
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DROP DATABASE abc_def;
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# restart
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DROP DATABASE abc_def2;
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call mtr.add_suppression("InnoDB: (Operating system error|The error means|Cannot rename file)");
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CREATE TABLE t1 (a INT) ENGINE=InnoDB;
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RENAME TABLE t1 TO non_existing_db.t1;
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ERROR HY000: Error on rename of './test/t1' to './non_existing_db/t1' (errno: 168 "Unknown (generic) error from engine")
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FOUND 1 /\[ERROR\] InnoDB: Cannot rename file '.*t1\.ibd' to '.*non_existing_db/ in mysqld.1.err
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DROP TABLE t1;
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