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The zero downtime environment is enabled through Real Application Clusters, or RAC. A RAC database is a database that is opened concurrently by two or more instances running on different machines. The database itself, which can be protected by Data Guard (there is no

It also creates the /etc/oratabfile,which is used to specify whether instances should be automatically started after a node is rebooted. When the root. sh script has been run on all nodes in the cluster, cUck OK on the Execute Configuration scripts dialog box to display the End of Installation page. Make a note of the URLs for iSQL*Plus, which is the browser-enabled version of SQL*Plus, and click Exit to terminate the OUI session.

The Oracle Clusterware installation is usually the most problematic part of a RAC database build procedure, because it is thefirsttime that all of the components are tested together. Yet, given a successful Oracle Clusterware installation, the Oracle Database Server software installation rarely fails, as it uses the same components.

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Notice how you specify that the size parameter comes first You do it this way because it s more likely that you ll want to create several files with the same buffer size than with the same name In the final line of the listing, you apply the create function to a list of files names to create a list of files streams You want each stream to be created with a buffer size of 1024 bytes, so pass the literal 1024 to.

The most useful troubleshooting tool is undoubtedly the Cluster Verification Utility (CLUVFY). Although C U F was only introduced in Oracle 10.2, it has rapidly established itself as the most comprehensive L VY and reliable utility available. Consequently, in this chapter, we show examples of its use together with output from successful runs. We recommend that you use this tool at every opportunity, as it is extremely good at detecting typos and omissions in the configuration. You can also use C U F to check Oracle 10.1 configurations, in which case you should specify L VY the -lOgRl option. We have, however, noticed that in early versions of Oracle 10.2, C U F was incomL VY patible with the newly introduced 0CFS2 software. It is easy to envisage this situation arising again in future releases where C U F lags behind new technologies. L VY

Over the years, we have encountered a handful of problems that cause installations to fail. Though C U F detects most of these, we have chosen to highlight them in this section. L VY User IDs The user ID (uid) for the oracle user must be identical on all nodes. You can verify the uid by logging on as the oracle user and issuing the id command: [oracleglondonl oracle]$ $id uid=500(oracle) gid=50l(oinstall) groups=50l(oinstall),5O0(dba) The uid is stored in the /etc/passwd file. However, you should not update this directly. Instead, we recommend using the usermod command. For example, to change the uid for the oracle user to 600, log in as root, and use the following: [root@londonl root]# usermod -u 600 oracle Remember that if you change the uid for a user, you must also update the ownership of any files belonging to that user using the chmod command. Group IDs The group ID (gid) for both the dba group and the oinstall group must also be identical on all nodes. You can verify the gid by logging on as the oracle user and issuing the id command. The gid is stored in the /etc/groupfile.You should not update this file directly either; instead, use the groupmod command. For example, to change the gid for the dba group to 700, log in as root and use

reason not to use RAC and Data Guard together), resides on a shared disk system accessible to all the machines RAC is not purely for fault tolerance Many sites will RAC their databases for reasons of scalability and performance, but it can certainly contribute to the goal of zero downtime by protecting against machine and operating system failure In the event of one RAC instance failing, the database will remain open and accessible through the surviving instance Sessions against the failed instance will be reinstantiated against the surviving instance The effect on the application will depend on how RAC is configured, and how the application will respond to having its database connection broken and then remade When a user process requests a connection to a database, the Oracle Net protocol maps this request onto one of the instances that make up the RAC configuration.

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