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Oracle RAC Tips

Oracle RAC and CFS

There are two main purposes for which CFS can be used in the Oracle9i RAC environment.

First, CFS makes it possible to set up all the shared data files, control files, server parameter files, redo log files, and the server configuration file in the file system. These are the files that would otherwise need to be located in raw partitions. The archive log files can also be located in the CFS directory to make them accessible for all nodes, as needed.

Secondly, other relevant files and directories associated with the RAC database environment can be placed on the CFS providing administrative ease. Such files and directories include:

  • Oracle External Tables.
  • Oracle Home directory, including all the Oracle executables.
  • Export Files generated from the database objects. (Useful for all the nodes)
  • Report Files and output of the utl_file function from other files.
  • File Systems with user files.
  • Files / Data Feed for loading into the database.

The cluster file system allows an administrator to install the Oracle product in a shared "Oracle Home." Because the Oracle Home is made available on the shared disk, all instances of Oracle will run from the same disk executables. The amount of disk space required will be significantly reduced as well as the installation time. Only one copy of the Oracle executables need be maintained.

A shared Oracle home also permits trace files and configuration files to be shared so that system administrators can work from any single node and access the whole system. Furthermore, patches need be applied only once.

Oracle9i has a new feature called ‘External Tables.’ The external table feature allows data in simple flat files to be treated as an Oracle table. It also allows the select command to be used on External Tables. Furthermore, External Tables can be accessed with Intra-node Parallel Query, taking advantage of the full processing power of the cluster. Without the CFS, the facility of External Tables becomes very limited. An External Table can be created in a non-clustered file system but the access to it will be limited to one node.

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.





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