我已经尝试过这个查询的不同变体,但我无法让它使用时间戳索引。我究竟做错了什么?
任何帮助将不胜感激 :)
MariaDB [alienvault]> explain extended SELECT * FROM alienvault_siem.acid_event WHERE (timestamp BETWEEN '2012-10-09 11:20:17' AND '2012-10-10 03:20:17');
+------+-------------+------------+------+---------------+------+---------+------+---------+----------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+------+-------------+------------+------+---------------+------+---------+------+---------+----------+-------------+
| 1 | SIMPLE | acid_event | ALL | timestamp | NULL | NULL | NULL | 4481579 | 50.00 | Using where |
+------+-------------+------------+------+---------------+------+---------+------+---------+----------+-------------+
1 row in set, 1 warning (0.01 sec)
表结构:
CREATE TABLE IF NOT EXISTS `acid_event` (
(...)
`timestamp` datetime NOT NULL,
(...)
PRIMARY KEY (`id`),
(...)
KEY `timestamp` (`timestamp`),
(...)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
软件:Percona 服务器
软件版本:5.5.27-28.1 - Percona Server (GPL),28.1 版