Thoughts on Adding a Single Instance To Oracle Clusterware (Grid Infra).

General: Configuring Active/Passive Clustering for Oracle Database ( Single Instance in Crs)

The Oracle database can easily be configured to use the Cluster ware framework for high availability.

Using Grid Infrastructure to protect a database resource is a very cost-effective way of setting up an Active/passive cluster. As an added advantage, using only one vendor’s software stack to implement the cluster can make troubleshooting easier. Staff already familiar with RAC will easily be able to set up and run this configuration because it uses a same software stack: all commands and log files are in familiar locations, and troubleshooting does not rely on the input from other teams.

To set up an active/passive cluster with 11g Release 2, you need to initially install Grid Infrastructure on all nodes of the cluster. Grid Infrastructure will give the user with a cluster logical volume manager: ASM. If for some reason another file system is required, you can choose the supported cluster file systems, including ACFS. Using a cluster file system that is mounted concurrently to both cluster nodes offers the advantage of not having to remount the database files and binaries in case of a node failure. Some configurations we saw suffered from extended fail over periods caused by required file system checks before the file system could be remounted.

On top of the Grid Infrastructure build, you do a local installation of the RDBMS. It is important that you do not choose a cluster installation when prompted so; otherwise, you risk violating your license agreement with Oracle.

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The Case of a Missing or Corrupt Spfile in your Grid Infra (


On a grid infra-structure ( cluster (SRVR1Rr – 2r -3r) we got more and more tickets that the ASM instances where having fragmented memory for the shared pool. The investigation showed that there was no SPFILE present, with automatic memory management in there. So this environment clearly needed better.  Only thing found was some out of date INIT.ORA.  From history this environment had been set up as an 11gr1 RAC cluster, and some time ago it had been upgraded to 11gr2 Grid Infra.

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