Oracle RAC 和 SCAN 侦听器
Oracle RAC and SCAN Listeners
我有一个 4 节点 RAC 架构，SCAN 侦听器 运行 在 3 个节点上。由于 Oracle 在下面的博客中建议至少使用 3 个 SCAN 监听器。
http://satya-racdba.blogspot.in/2012/09/scan-in-oracle-rac-11g-r2.html
但是4th Listener也需要配置SCAN吗？
第 4 个节点是否被 SCAN 侦听器拾取？
如何测试？
Oracle 不推荐三个 scna 侦听器的 miiumum。甲骨文声明：
SCAN is a domain name registered to at least one and up to three IP addresses, either in the domain name service (DNS) or the Grid Naming Service (GNS).
您可以在 Metalink 注释中找到此信息：
Grid Infrastructure Single Client Access Name (SCAN) Explained (Doc ID 887522.1)
在图中您可以看到 oracle SCAN 的示例架构：
A new set of cluster processes called scan listeners will run on three nodes in a cluster (or all nodes if there are less than 3). If you have more than three nodes, regardless of the number of nodes you have, there will be at most three scan listeners. The database registers with the SCAN listener through the remote listener parameter in the init.ora/spfile. If any of these clustered processes fail, they are automatically restarted on a new node.
如果您必须进行安装，最好查看 Oralce 文档：
D Oracle Grid Infrastructure for a Cluster Installation Concepts
我有一个 4 节点 RAC 架构，SCAN 侦听器 运行 在 3 个节点上。由于 Oracle 在下面的博客中建议至少使用 3 个 SCAN 监听器。
http://satya-racdba.blogspot.in/2012/09/scan-in-oracle-rac-11g-r2.html
但是4th Listener也需要配置SCAN吗？
第 4 个节点是否被 SCAN 侦听器拾取？
如何测试？
Oracle 不推荐三个 scna 侦听器的 miiumum。甲骨文声明：
SCAN is a domain name registered to at least one and up to three IP addresses, either in the domain name service (DNS) or the Grid Naming Service (GNS).
您可以在 Metalink 注释中找到此信息：
Grid Infrastructure Single Client Access Name (SCAN) Explained (Doc ID 887522.1)
在图中您可以看到 oracle SCAN 的示例架构：
A new set of cluster processes called scan listeners will run on three nodes in a cluster (or all nodes if there are less than 3). If you have more than three nodes, regardless of the number of nodes you have, there will be at most three scan listeners. The database registers with the SCAN listener through the remote listener parameter in the init.ora/spfile. If any of these clustered processes fail, they are automatically restarted on a new node.
如果您必须进行安装，最好查看 Oralce 文档： D Oracle Grid Infrastructure for a Cluster Installation Concepts