Node Startup Sequence
- Operating System
- Oracle Clusterware
- VIP1
- ASM
- Instance 1
- Listner
- 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.