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I've found similar posts on this forum, but migrate it to another one if needed.

We want to migrate to PostgreSQL from Oracle, but we have 6000 users simultaneously connected to a 4 To GIS database(divided in 1 To instances) and many other instances for WebServices.

Before looking at other problems, we heard that 500 max connected users is the max limit supported before performances decrease, decrease augmented when size of database become huge.

Have you got any (or do you know links to) successful experience on such a migration?
Do we have to wait for PostgreSQL better performances to migrate?

EDIT

Found another example.

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请阅读Kevin Grittner 关于该主题的这篇文章，它将解释很多连接为何存在问题以及 PostgreSQL 核心团队解决此问题的决定。

有关成功案例的列表，请参阅EnterpriseDB 站点，这是一家为标准 PostgreSQL 发行版提供支持以及为基于标准发行版构建的高级产品提供支持和许可的公司。对于企业数据库使用Postgres Plus Advanced Server可能是一个不错的选择。

于 2012-07-04T12:17:22.607 回答