Adding service to single instance database

Database services (services) are logical abstractions for managing workloads in Oracle Database. Each service represents a workload with common attributes, service-level thresholds, and priorities.

In Real Application Clusters (RAC), a service can span one or more instances and facilitate real workload balancing based on real transaction performance.   RAC also enables you to manage a number of service features with Enterprise Manager, the DBCA, and the Server Control utility (SRVCTL).

ORA-00304: requested INSTANCE_NUMBER is busy

Environment: 2 nodes Oracle RAC 11gR2, Linux 5
Scenario: Node1 has a single instance database named testdb, same testdb was restored to the Node2 (as single also) , while starting the instance on node2 for testdb (single instance) gave the error below:
ORA-00304: requested INSTANCE_NUMBER is busy

Setting up an NFS share

NFS (Network File System) is a protocol used by UNIX/Linux computers to share disks across a network. Similar to the Common Internet File Services (CIFS) protocol used by Windows, NFS is older and more light-weight, and performs much more efficiently on UNIX and Linux systems.

Adding vip resource (11gR2 Linux)

Enviroment: Oracle Linux 5 update 5 64bit, Oracle RAC 11gR2

While installing  RDBMS software on Oracle 11gR2 cluster following error was encountered.

ORA-12631: Username retrieval failed

Case:
While attempting to connect to the database the following error occurs.

c:\temp\dig>sqlplus /@qanew as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Tue Oct 2 09:09:07 2012

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

ERROR:
ORA-12631: Username retrieval failed
 

Configuring Transparent Application Failover

Transparent Application Failover (TAF) is a client-side feature that allows for clients to reconnect to surviving databases in the event of a failure of a database instance. Notifications are used by the server to trigger TAF callbacks on the client-side.