create table t1 (
id1 bigint(20) not null,
id2 bigint(20) not null,
primary key (id1),
unique key id2 (id2)
) engine=innodb row_format=compressed key_block_size=8;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id1` bigint(20) NOT NULL,
  `id2` bigint(20) NOT NULL,
  PRIMARY KEY (`id1`),
  UNIQUE KEY `id2` (`id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8
SET innodb_strict_mode=ON;
alter table t1 row_format=dynamic;
ERROR HY000: Table storage engine 'InnoDB' does not support the create option 'KEY_BLOCK_SIZE'
SET innodb_strict_mode=OFF;
alter table t1 row_format=dynamic;
Warnings:
Warning	1478	InnoDB: ignoring KEY_BLOCK_SIZE=8 unless ROW_FORMAT=COMPRESSED.
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id1` bigint(20) NOT NULL,
  `id2` bigint(20) NOT NULL,
  PRIMARY KEY (`id1`),
  UNIQUE KEY `id2` (`id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ROW_FORMAT=DYNAMIC KEY_BLOCK_SIZE=8
SET innodb_strict_mode=ON;
alter table t1 key_block_size=0;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id1` bigint(20) NOT NULL,
  `id2` bigint(20) NOT NULL,
  PRIMARY KEY (`id1`) KEY_BLOCK_SIZE=8,
  UNIQUE KEY `id2` (`id2`) KEY_BLOCK_SIZE=8
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ROW_FORMAT=DYNAMIC
alter table t1 drop primary key, add primary key (id1),
drop key id2, add unique (id2);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id1` bigint(20) NOT NULL,
  `id2` bigint(20) NOT NULL,
  PRIMARY KEY (`id1`),
  UNIQUE KEY `id2` (`id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ROW_FORMAT=DYNAMIC
drop table t1;