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Marko Mäkelä e581396b7a MDEV-29983 Deprecate innodb_file_per_table 
Before commit 6112853cda in 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 commit b5852ffbee.
Starting with commit baf276e6d4
(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
commit 86dc7b4d4c (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.
2023-01-11 17:55:56 +02:00

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#
# MDEV-15953 Alter InnoDB Partitioned Table Moves Files (which were originally not in the datadir) to the datadir
#
CREATE TABLE t (
a INT NOT NULL
) ENGINE=INNODB
PARTITION BY HASH (a) (
PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/' ENGINE = INNODB,
PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/' ENGINE = INNODB
);
INSERT INTO t VALUES (1);
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
ALTER TABLE t ADD PRIMARY KEY pk(a), ALGORITHM=INPLACE;
Warnings:
Warning 1280 Name 'pk' ignored for PRIMARY key.
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL,
PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
ALTER TABLE t DROP PRIMARY KEY, ALGORITHM=COPY;
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
SET @TMP = @@GLOBAL.INNODB_FILE_PER_TABLE;
SET GLOBAL INNODB_FILE_PER_TABLE=OFF;
Warnings:
Warning 1287 '@@innodb_file_per_table' is deprecated and will be removed in a future release
ALTER TABLE t ADD PRIMARY KEY pk(a), ALGORITHM=INPLACE;
Warnings:
Warning 1280 Name 'pk' ignored for PRIMARY key.
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL,
PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
SET GLOBAL INNODB_FILE_PER_TABLE=@TMP;
Warnings:
Warning 1287 '@@innodb_file_per_table' is deprecated and will be removed in a future release
ALTER TABLE t REORGANIZE PARTITION p1,p2 INTO (
PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB,
PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB
);
Warnings:
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL,
PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
ALTER TABLE t REORGANIZE PARTITION p1,p2 INTO (
PARTITION p1 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/',
PARTITION p2 DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/'
);
Warnings:
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL,
PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
ALTER TABLE t REORGANIZE PARTITION p1,p2 INTO (
PARTITION p1 INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB,
PARTITION p2 INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = INNODB
);
Warnings:
Warning 1982 <INDEX DIRECTORY> option ignored for InnoDB partition
Warning 1982 <INDEX DIRECTORY> option ignored for InnoDB partition
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL,
PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY HASH (`a`)
(PARTITION `p1` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB,
PARTITION `p2` DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here' ENGINE = InnoDB)
DROP TABLE t;
SET @strict = @@innodb_strict_mode;
SET innodb_strict_mode=OFF;
CREATE TABLE t (
a INT NOT NULL
) ENGINE=INNODB
PARTITION BY RANGE (a)
SUBPARTITION BY HASH (a)
SUBPARTITIONS 2
(
PARTITION p1 VALUES LESS THAN (7)
DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/'
INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/'
ENGINE = INNODB,
PARTITION p2 VALUES LESS THAN MAXVALUE
DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/'
INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_here/'
ENGINE = INNODB
);
Warnings:
Warning 1618 <INDEX DIRECTORY> option ignored
Warning 1618 <INDEX DIRECTORY> option ignored
Warning 1618 <INDEX DIRECTORY> option ignored
Warning 1618 <INDEX DIRECTORY> option ignored
SET innodb_strict_mode=@strict;
ALTER TABLE t
REORGANIZE PARTITION p1,p2 INTO
(
PARTITION p1 VALUES LESS THAN (7)
DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/'
INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/'
ENGINE = INNODB,
PARTITION p2 VALUES LESS THAN MAXVALUE
DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/'
INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/'
ENGINE = INNODB
);
Warnings:
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
Warning 1982 <INDEX DIRECTORY> option ignored for InnoDB partition
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
Warning 1982 <INDEX DIRECTORY> option ignored for InnoDB partition
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
Warning 1982 <INDEX DIRECTORY> option ignored for InnoDB partition
Warning 1982 <DATA DIRECTORY> option ignored for InnoDB partition
Warning 1982 <INDEX DIRECTORY> option ignored for InnoDB partition
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`a` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
PARTITION BY RANGE (`a`)
SUBPARTITION BY HASH (`a`)
SUBPARTITIONS 2
(PARTITION `p1` VALUES LESS THAN (7) DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = InnoDB,
PARTITION `p2` VALUES LESS THAN MAXVALUE DATA DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/tmp/partitions_somewhere_else/' ENGINE = InnoDB)
DROP TABLE t;
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