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Note: All the posts are based on practical approach avoiding lengthy theory. All have been tested on some development servers. Please don’t test any post on production servers until you are sure.

Monday, October 15, 2012

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).

Sunday, October 14, 2012

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

Wednesday, October 10, 2012

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.

Monday, October 08, 2012

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.

Tuesday, October 02, 2012

ORA-12631: Username retrieval failed

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

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

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

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

ORA-12631: Username retrieval failed

Monday, October 01, 2012

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.