PostgreSQL 9.1 的第二个 alpha 测试版发布了，该版本包含很多主要的新特性的加入，请下载、安装并进行测试，然后将测试结果反馈给我们。
该版本新增的特性包括：
- 视图触发器支持 INSERT, UPDATE, and DELETE 等操作
- 可修改的枚举类型
- WITH clauses on INSERT, UPDATE, DELETE statements. These allow users to update rows recursively or according to complex criteria that would have previously required procedural code
- pg_hba.conf 配置支持使用主机名来替代IP地址
- Updates to contrib/isn ISBN tables, supporting recent ISBN standards
更详细的信息请看发行说明：available in the release notes
Download the alpha release
