MariaDB [test]> create table ttt(id_1 int auto_increment, id_2 int, id_3 int, d1 date, dt1 datetime default current_timestamp, dt2 datetime default current_timestamp on update current_timestamp, primary key (id_2, id_3), key(id_1)) engine=myisam partition by hash(id_2) partitions 3 (partition p01 engine=myisam, partition p02 engine=myisam, partition p03 engine=myisam);
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Query OK, 0 rows affected (0.04 sec)
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MariaDB [test]> insert into ttt values(0, 1, 1, NULL, now(), now());
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Query OK, 1 row affected (0.00 sec)
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MariaDB [test]> select * from ttt;
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+------+------+------+------+---------------------+---------------------+
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| id_1 | id_2 | id_3 | d1 | dt1 | dt2 |
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+------+------+------+------+---------------------+---------------------+
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| 1 | 1 | 1 | NULL | 2017-06-15 10:35:10 | 2017-06-15 10:35:10 |
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+------+------+------+------+---------------------+---------------------+
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1 row in set (0.00 sec)
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MariaDB [test]> alter online table tt delay_key_write=1;
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Query OK, 0 rows affected (0.00 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]> alter online table tt delay_key_write=0;
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Query OK, 0 rows affected (0.01 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]> alter online table ttt delay_key_write=1;
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ERROR 1845 (0A000): LOCK=NONE is not supported for this operation. Try LOCK=SHARED.
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MariaDB [test]> alter online table ttt delay_key_write=1, lock=shared;
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Query OK, 1 row affected (0.04 sec)
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Records: 1 Duplicates: 0 Warnings: 0
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MariaDB [test]> show create table ttt\G
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*************************** 1. row ***************************
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Table: ttt
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Create Table: CREATE TABLE `ttt` (
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`id_1` int(11) NOT NULL AUTO_INCREMENT,
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`id_2` int(11) NOT NULL,
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`id_3` int(11) NOT NULL,
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`d1` date DEFAULT NULL,
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`dt1` datetime DEFAULT CURRENT_TIMESTAMP,
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`dt2` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
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PRIMARY KEY (`id_2`,`id_3`),
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KEY `id_1` (`id_1`)
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) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 DELAY_KEY_WRITE=1
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/*!50100 PARTITION BY HASH (id_2)
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(PARTITION p01 ENGINE = MyISAM,
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PARTITION p02 ENGINE = MyISAM,
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PARTITION p03 ENGINE = MyISAM) */
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1 row in set (0.00 sec)
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