今天上线了一个日文项目，项目中使用到了RDS Mysql的全文索引服务，当所有所有准备好测试时发现，RDS的innodb_ft_min_token_size参数默认配置是3个字, 有很2个字的词就没有结果了，所以只能修改RDS的参数组配置来实现了。

innodb_ft_min_token_size: "Minimum length of words that are stored in an InnoDB FULLTEXT index."

下面简单说一下配置：
1. 参数组中的default.mysql56是不允许修改的

2. 新建一个参数组出来,然后修改需要自己定义的参数

3. 编辑实例，修改参数组，最下面选中“立即生效”

4. 回到实例，显示等待重启时，重启实例

注意： 如果动态的参数，不需要重启实例， 如果是静态实例需要重启实例（不幸的是，我这次改的是静态参数）

为了测试重启花费的时间写了个小程序检查链接，最终花了20秒完成，如下参考：

2015-11-12 08:51:08
2015-11-12 08:51:09
2015-11-12 08:51:10
2015-11-12 08:51:11
2015-11-12 08:51:12
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:13
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:14
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:15
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:16
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:17
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:18
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:19
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:20
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:21
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:22
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:23
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:24
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:25
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:26
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:27
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:28
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:29
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:30
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:31
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:32
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:33
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:34
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:35
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:36
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:37
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:38
Connection failed: SQLSTATE[HY000] [2002] Connection refused2015-11-12 08:51:39
2015-11-12 08:51:40
2015-11-12 08:51:41
2015-11-12 08:51:42

更多文档参考： http://docs.aws.amazon.com/zh_cn/AmazonRDS/latest/UserGuide/USER_WorkingWithParamGroups.html
日文分词参考： http://blog.hexu.org/archives/738.shtml