PostgreSQL 是一個(gè)自由的對(duì)象-關(guān)系數(shù)據(jù)庫服務(wù)器（數(shù)據(jù)庫管理系統(tǒng)），它在靈活的 BSD-風(fēng)格許可證下發(fā)行。它在其他開放源代碼數(shù)據(jù)庫系統(tǒng)（比如 MySQL 和 Firebird），和專有系統(tǒng)比如 Oracle、Sybase、IBM 的 DB2 和 Microsoft SQL Server之外，為用戶又提供了一種選擇。
* 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!