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Have you ever wondered why on an Oracle Real Application Clusters 10g node if
you "kill -9" a database LGWR process in Linux the database gets restarted
automatically? Or when using the Task Manager in Microsoft Windows, kill the
oracle.exe or tnslsnr.exe process, they restart again automatically? Or how, when a
node dies in an Oracle RAC 10g cluster, the Virtual IP (VIP) fails over to a
different node? – The service that provides this is a feature of Oracle Clusterware.
Starting with Oracle Database 10g, Oracle provides this portable clusterware solution that is integrated with and designed specifically for the Oracle Database Server. You no longer have to purchase proprietary, expensive third-party clusterware in order to have a RAC database. Oracle Clusterware is integrated with the Oracle Universal Installer which the Oracle DBA is already familiar with. Support is made easier as there is only one support organization to deal with for the clusterware and cluster database. So the advent of Oracle RAC 10g brought you the opportunity to simplify your software stack.
Oracle Clusterware monitors and manages Real Application Clusters databases. When a node in the cluster is started, all instances, listeners and services are automatically started. If an instance fails, the clusterware will automatically restart the instance so the service is often restored before the administrator notices it was down.
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