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自动设置我有以下的MyISAM表MySQL索引的前缀长度在Ubuntu
mysql> show create table product_desc\G
*************************** 1. row ***************************
Table: product_desc
Create Table: CREATE TABLE `product_desc` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`product_id` int(10) unsigned DEFAULT '0',
`title` varchar(100) DEFAULT NULL,
`description` varchar(5000) DEFAULT NULL,
PRIMARY KEY (`id`),
FULLTEXT KEY `title` (`title`,`description`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
然而,当我想改变表(添加索引)用下面的命令,我得到了错误。
mysql> ALTER TABLE product_desc ADD INDEX `description` (`description`);
ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
奇怪的是,这只发生在Mac OSX上,而不是在我的Ubuntu服务器上。所以,检查我的服务器上的结果表,并得到这个:
mysql> show indexes from product_desc;
+------------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+------------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| product_desc | 0 | PRIMARY | 1 | id | A | 5 | NULL | NULL | | BTREE | | |
| product_desc | 1 | description | 1 | description | A | 5 | 333 | NULL | YES | BTREE | | |
| product_desc | 1 | title | 1 | title | NULL | 1 | NULL | NULL | YES | FULLTEXT | | |
| product_desc | 1 | title | 2 | description | NULL | 1 | NULL | NULL | YES | FULLTEXT | | |
+------------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
6 rows in set (0.00 sec)
有趣的部分是自动description
指数获得333前缀length.So我的问题是,它是如何发生的那样?是否有需要在MacOS my.cnf上设置的配置变量以获得相同的结果?
您是否在两个系统上运行完全相同的主/次/发行版本的MySQL?涉及哪些版本? –
关于ubuntu的mysql版本是:5.5.32-0ubuntu0.12.04.1,MacOS版本是5.6.12,我在http://pastebin.com/cppRZHQs上粘贴了详细信息 – Fajarmf