[bbk3103]第10集 Chapter 06 介绍RAC的体系结构

Node Startup Sequence

1. Operating System
2. Oracle Clusterware
3. VIP1
4. ASM
5. Instance 1
6. Listner
7. Service

 

Oracle Dependencies Prior to 10.2.0.3

在oracle 10.2.0.3之前，如果出现VIP1漂移的情况，Oracle会把VIP1所在节点的instance及linsnter给down掉.当vip1修复完成之后，需要重启lisnter及instance；在oracle10.2.0.3之后，即使vip出现漂移，所在节点的lisnter及instance不会被down掉,恢复回来之后，可以立即使用instance 及lisnter.

Oracle Notification Service(ONS)

• Publish /Subscribe Messaging System
• Allows both local and remote consumption
• Used by Fast Application Notification(FAN) to publish HA Events and Load Blancing Events
• Used by FAN clients to subscribe to events
• Automatically installed and configured by the installation of Oracle Clusterware
• Don`t turn off - Required by Oracle Clusterware and RAC

ons功能对于RAC来讲是必须的，不能turn off的.

Runtime Connection Load Balancing

• When application does "getConnection",the conneciton given is the one that will provide the best service.
• Supported by Oracle JDBS,OCI,and ODP.NET connection Pools
• Policy defined by setting GOAL on Service
• Need to have Oracle Net Services Connection Load Balancing.