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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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CREATE DATABASE mysqltest_innodb_zip;
USE mysqltest_innodb_zip;
SELECT table_name, row_format, data_length, index_length
FROM information_schema.tables
WHERE table_schema='mysqltest_innodb_zip';
table_name row_format data_length index_length
SET @save_innodb_stats_on_metadata=@@global.innodb_stats_on_metadata;
set session innodb_strict_mode=0;
SET @save_fpt=@@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
SET @@global.innodb_stats_on_metadata=ON;
create table t0(a int primary key) engine=innodb row_format=compressed;
Warnings:
Warning 1478 InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_per_table.
Warning 1478 InnoDB: assuming ROW_FORMAT=DYNAMIC.
create table t00(a int primary key) engine=innodb
key_block_size=4 row_format=compressed;
Warnings:
Warning 1478 InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=4.
Warning 1478 InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_per_table.
Warning 1478 InnoDB: assuming ROW_FORMAT=DYNAMIC.
create table t1(a int primary key) engine=innodb row_format=dynamic;
create table t2(a int primary key) engine=innodb row_format=redundant;
create table t3(a int primary key) engine=innodb row_format=compact;
create table t4(a int primary key) engine=innodb key_block_size=9;
Warnings:
Warning 1478 InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=9.
create table t5(a int primary key) engine=innodb
key_block_size=1 row_format=redundant;
Warnings:
Warning 1478 InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=1.
set global innodb_file_per_table=on;
Warnings:
Warning 1287 '@@innodb_file_per_table' is deprecated and will be removed in a future release
create table t6(a int primary key) engine=innodb
key_block_size=1 row_format=redundant;
Warnings:
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=1 unless ROW_FORMAT=COMPRESSED.
create table t7(a int primary key) engine=innodb
key_block_size=1 row_format=redundant;
Warnings:
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=1 unless ROW_FORMAT=COMPRESSED.
create table t8(a int primary key) engine=innodb
key_block_size=1 row_format=fixed;
Warnings:
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=1 unless ROW_FORMAT=COMPRESSED.
Warning 1478 InnoDB: assuming ROW_FORMAT=DYNAMIC.
create table t9(a int primary key) engine=innodb
key_block_size=1 row_format=compact;
Warnings:
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=1 unless ROW_FORMAT=COMPRESSED.
create table t10(a int primary key) engine=innodb
key_block_size=1 row_format=dynamic;
Warnings:
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=1 unless ROW_FORMAT=COMPRESSED.
create table t11(a int primary key) engine=innodb
key_block_size=1 row_format=compressed;
create table t12(a int primary key) engine=innodb
key_block_size=1;
create table t13(a int primary key) engine=innodb
row_format=compressed;
create table t14(a int primary key) engine=innodb key_block_size=9;
Warnings:
Warning 1478 InnoDB: ignoring KEY_BLOCK_SIZE=9.
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t0 Dynamic {valid} 0
mysqltest_innodb_zip t00 Dynamic {valid} 0
mysqltest_innodb_zip t1 Dynamic {valid} 0
mysqltest_innodb_zip t10 Dynamic {valid} 0
mysqltest_innodb_zip t11 Compressed 1024 0
mysqltest_innodb_zip t12 Compressed 1024 0
mysqltest_innodb_zip t13 Compressed {valid} 0
mysqltest_innodb_zip t14 Dynamic {valid} 0
mysqltest_innodb_zip t2 Redundant {valid} 0
mysqltest_innodb_zip t3 Compact {valid} 0
mysqltest_innodb_zip t4 Dynamic {valid} 0
mysqltest_innodb_zip t5 Redundant {valid} 0
mysqltest_innodb_zip t6 Redundant {valid} 0
mysqltest_innodb_zip t7 Redundant {valid} 0
mysqltest_innodb_zip t8 Dynamic {valid} 0
mysqltest_innodb_zip t9 Compact {valid} 0
drop table t0,t00,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14;
alter table t1 key_block_size=0;
alter table t1 row_format=dynamic;
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t1 Dynamic {valid} 0
alter table t1 row_format=compact;
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t1 Compact {valid} 0
alter table t1 row_format=redundant;
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t1 Redundant {valid} 0
drop table t1;
create table t1(a int not null, b text, index(b(10))) engine=innodb
key_block_size=1;
create table t2(b text)engine=innodb;
insert into t2 values(concat('1abcdefghijklmnopqrstuvwxyz', repeat('A',5000)));
insert into t1 select 1, b from t2;
commit;
connect a,localhost,root,,mysqltest_innodb_zip;
connect b,localhost,root,,mysqltest_innodb_zip;
connection a;
begin;
update t1 set b=repeat('B',100);
connection b;
select a,left(b,40) from t1 natural join t2;
a left(b,40)
1 1abcdefghijklmnopqrstuvwxyzAAAAAAAAAAAAA
connection a;
rollback;
connection b;
select a,left(b,40) from t1 natural join t2;
a left(b,40)
1 1abcdefghijklmnopqrstuvwxyzAAAAAAAAAAAAA
connection default;
disconnect a;
disconnect b;
analyze table t1;
Table Op Msg_type Msg_text
mysqltest_innodb_zip.t1 analyze status Engine-independent statistics collected
mysqltest_innodb_zip.t1 analyze Warning Engine-independent statistics are not collected for column 'b'
mysqltest_innodb_zip.t1 analyze status OK
analyze table t2;
Table Op Msg_type Msg_text
mysqltest_innodb_zip.t2 analyze status Engine-independent statistics collected
mysqltest_innodb_zip.t2 analyze Warning Engine-independent statistics are not collected for column 'b'
mysqltest_innodb_zip.t2 analyze status OK
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t1 Compressed 2048 1024
mysqltest_innodb_zip t2 Dynamic {valid} 0
drop table t1,t2;
create table t1( c1 int not null, c2 blob, c3 blob, c4 blob,
primary key(c1, c2(22), c3(22)))
engine = innodb row_format = dynamic;
begin;
insert into t1 values(1, repeat('A', 20000), repeat('B', 20000),
repeat('C', 20000));
update t1 set c3 = repeat('D', 20000) where c1 = 1;
commit;
select count(*) from t1 where c2 = repeat('A', 20000);
count(*)
1
select count(*) from t1 where c3 = repeat('D', 20000);
count(*)
1
select count(*) from t1 where c4 = repeat('C', 20000);
count(*)
1
update t1 set c3 = repeat('E', 20000) where c1 = 1;
drop table t1;
set innodb_strict_mode = off;
create table t1 (id int primary key) engine = innodb key_block_size = 0;
drop table t1;
set innodb_strict_mode = on;
create table t1 (id int primary key) engine = innodb key_block_size = 0;
create table t2 (id int primary key) engine = innodb key_block_size = 9;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: invalid KEY_BLOCK_SIZE = 9. Valid values are [1, 2, 4, 8, 16]
Error 1005 Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t3 (id int primary key) engine = innodb key_block_size = 1;
create table t4 (id int primary key) engine = innodb key_block_size = 2;
create table t5 (id int primary key) engine = innodb key_block_size = 4;
create table t8 (id int primary key) engine = innodb row_format = compressed;
create table t9 (id int primary key) engine = innodb row_format = dynamic;
create table t10(id int primary key) engine = innodb row_format = compact;
create table t11(id int primary key) engine = innodb row_format = redundant;
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t1 Dynamic {valid} 0
mysqltest_innodb_zip t10 Compact {valid} 0
mysqltest_innodb_zip t11 Redundant {valid} 0
mysqltest_innodb_zip t3 Compressed 1024 0
mysqltest_innodb_zip t4 Compressed {valid} 0
mysqltest_innodb_zip t5 Compressed {valid} 0
mysqltest_innodb_zip t8 Compressed {valid} 0
mysqltest_innodb_zip t9 Dynamic {valid} 0
drop table t1, t3, t4, t5, t8, t9, t10, t11;
create table t1 (id int primary key) engine = innodb
key_block_size = 4 row_format = compressed;
create table t2 (id int primary key) engine = innodb
key_block_size = 4 row_format = redundant;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: cannot specify ROW_FORMAT = REDUNDANT with KEY_BLOCK_SIZE.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t3 (id int primary key) engine = innodb
key_block_size = 4 row_format = compact;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t3` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: cannot specify ROW_FORMAT = COMPACT with KEY_BLOCK_SIZE.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t3` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t4 (id int primary key) engine = innodb
key_block_size = 4 row_format = dynamic;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t4` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: cannot specify ROW_FORMAT = DYNAMIC with KEY_BLOCK_SIZE.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t4` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t5 (id int primary key) engine = innodb
key_block_size = 4 row_format = default;
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t1 Compressed 4096 0
mysqltest_innodb_zip t5 Compressed 4096 0
drop table t1, t5;
create table t1 (id int primary key) engine = innodb
key_block_size = 9 row_format = redundant;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t1` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: invalid KEY_BLOCK_SIZE = 9. Valid values are [1, 2, 4, 8, 16]
Warning 1478 InnoDB: cannot specify ROW_FORMAT = REDUNDANT with KEY_BLOCK_SIZE.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t1` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t2 (id int primary key) engine = innodb
key_block_size = 9 row_format = compact;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: invalid KEY_BLOCK_SIZE = 9. Valid values are [1, 2, 4, 8, 16]
Warning 1478 InnoDB: cannot specify ROW_FORMAT = COMPACT with KEY_BLOCK_SIZE.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t2 (id int primary key) engine = innodb
key_block_size = 9 row_format = dynamic;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: invalid KEY_BLOCK_SIZE = 9. Valid values are [1, 2, 4, 8, 16]
Warning 1478 InnoDB: cannot specify ROW_FORMAT = DYNAMIC with KEY_BLOCK_SIZE.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
set global innodb_file_per_table = off;
Warnings:
Warning 1287 '@@innodb_file_per_table' is deprecated and will be removed in a future release
create table t1 (id int primary key) engine = innodb key_block_size = 1;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t1` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t1` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t2 (id int primary key) engine = innodb key_block_size = 2;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t2` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t3 (id int primary key) engine = innodb key_block_size = 4;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t3` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t3` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t6 (id int primary key) engine = innodb row_format = compressed;
ERROR HY000: Can't create table `mysqltest_innodb_zip`.`t6` (errno: 140 "Wrong create options")
show warnings;
Level Code Message
Warning 1478 InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_per_table.
Error 1005 Can't create table `mysqltest_innodb_zip`.`t6` (errno: 140 "Wrong create options")
Warning 1030 Got error 140 "Wrong create options" from storage engine InnoDB
create table t7 (id int primary key) engine = innodb row_format = dynamic;
show warnings;
Level Code Message
create table t8 (id int primary key) engine = innodb row_format = compact;
create table t9 (id int primary key) engine = innodb row_format = redundant;
SELECT table_schema, table_name, row_format, data_length, index_length FROM information_schema.tables WHERE engine='innodb' AND table_schema != 'mysql' and table_schema != 'sys' order by table_name;
table_schema table_name row_format data_length index_length
mysqltest_innodb_zip t7 Dynamic {valid} 0
mysqltest_innodb_zip t8 Compact {valid} 0
mysqltest_innodb_zip t9 Redundant {valid} 0
drop table t7, t8, t9;
SET GLOBAL innodb_file_per_table=@save_fpt;
Warnings:
Warning 1287 '@@innodb_file_per_table' is deprecated and will be removed in a future release
SET @@global.innodb_stats_on_metadata=@save_innodb_stats_on_metadata;
DROP DATABASE mysqltest_innodb_zip;
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