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自動設置我有以下的MyISAM表MySQL索引的前綴長度在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,當我想改變表(添加索引)用下面的命令,我得到了錯誤。
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,這隻發生在Mac OSX上,而不是在我的Ubuntu服務器上。所以,檢查我的服務器上的結果表,並得到這個:
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)
有趣的部分是自動description
指數獲得333前綴length.So我的問題是,它是如何發生的那樣?是否有需要在MacOS my.cnf上設置的配置變量以獲得相同的結果?
您是否在兩個系統上運行完全相同的主/次/發行版本的MySQL?涉及哪些版本? –
關於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上粘貼了詳細信息 – Fajarmf