PostgreSQL 是一个自由的对象-关系数据库服务器（数据库管理系统），它在灵活的 BSD-风格许可证下发行。它在其他开放源代码数据库系统（比如 MySQL 和 Firebird），和专有系统比如 Oracle、Sybase、IBM 的 DB2 和 Microsoft SQL Server之外，为用户又提供了一种选择。

 

• Parallel Database Restore, speeding up recovery from backup up to 8 times
• Per-Column Permissions, allowing more granular control of sensitive data
• Per-database Collation Support, making PostgreSQL more useful in multi-lingual environments
• In-place Upgrades through pg_migrator (beta), enabling upgrades from 8.3 to 8.4 without extensive downtime
• New Query Monitoring Tools, giving administrators more insight into query activity
• Greatly Reduced VACUUM Overhead through the Visibility Map
• New Monitoring Tools for current queries, query load and deadlocks

Version 8.4 also makes data analysis easier through the advanced ANSI SQL2003 features of windowing functions, common table expressions and recursive queries. Enhancements to stored procedures, such as default parameters and variadic parameters, make database server programming simpler and more compact. Of course, there are also performance improvements included in this version.

Download version 8.4 today and start enjoying using PostgreSQL even more!

• Download PostgreSQL 8.4
• Release Notes
• List of 8.4 Features
• Official Press Release （责任编辑：A6）