Oracle 11g RAC SCAN basics

最新推荐文章于 2018-10-15 14:42:00 发布

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最新推荐文章于 2018-10-15 14:42:00 发布

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本文解释了Oracle RAC环境中SCAN和VIP的基本工作原理。客户端通过SCAN名称解析到IP地址，并连接到SCAN监听器。SCAN监听器根据远程监听器设置，接收来自数据库和ASM实例的服务可用信息。客户端请求被处理后，SCAN监听器会返回一个重定向，指向具体主机上的本地监听器，以支持所需服务。客户端随后连接到该IP地址和本地监听器，请求所需的特定服务。

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The basics.

Client uses SCAN hostname. This resolves to an IP address (or addresses). The client uses the IP to connect to the SCAN listener.

The SCAN listener (via the remote_listener setting) is continually informed by the various database and ASM instances of what services are available, and on which hosts.

The SCAN listener processes the client's request and sends a redirect back to a specific host with a local listener supporting the specific service.

The client receives the redirect. It resolves that hostname (typically a VIP hostname) to an IP address (typically a VIP). It now connects to that IP and local listener on it, requesting a connection to the required service.

FROM:

Difference between SCAN and VIP in RAC ??

https://community.oracle.com/message/11242902