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Each additional node can help speed up application processing, support more users or processes, or both. In addition, you can also add cluster nodes to increase the availability and reliability of a two-node RAC database. The more nodes that your RAC environment has, the less the effect that the loss of any individual node has on the database.
Although you can choose how many nodes your cluster should have and what type of shared storage to use, this appendix is based on one specific configuration, which is the recommended configuration for two-computer, or two-node, clusters.
In addition, the instructions for the Enterprise Edition interface tasks use the Enterprise Manager Database Control console. This appendix does not provide cluster database installation and configuration procedures. Most administration tasks are the same for Oracle single-instance and RAC databases.
This appendix provides additional instructions for some of the RAC-specific database administration tasks, as well as some recommendations for managing RAC databases. This section describes how Oracle Enterprise Manager Console enables you to monitor your RAC database at the cluster level, for a high-level view of activity, and at the instance level, where tuning is similar to single-instance database tuning. This section contains the following topics:.
This includes a summary about alerts and job activity as well as links to all of the database and ASM instances. The page shows the statuses for non-running instances as DOWN. You can start the non-running instances or stop the running instances as needed using the Startup and Shutdown buttons respectively that appear in the General section of the page.
Click the Performance tab to see detailed RAC database metrics. If critical or warning alerts appear in the Severity column, then you can analyze them by clicking directly on the alert.
The Alerts table lists cluster-wide database alerts in order of severity, sorted by database components. For more information about an alert, click the text in the Message column. This takes you to the specific page that measures the system state of the process that triggered the alert.
On the Cluster Database Home Page level, you can select the Performance , Administration , and Maintenance tabs at the top of the page or you can select the same tabs from just above the Instances table. These three links enable you to perform clusterwide administration tasks.
You can obtain help to understand the task options and metric definitions by clicking the Help link next to the Database tab. After you navigate to individual metrics displays, or to return to the Cluster Database Home Page, click the Database tab in the upper right-hand corner of the page.
On the Cluster Database Page, a target can be a cluster, a database instance, or an Oracle utility, such as a listener. The console obtains metrics that provide information about the current states of the targets.
The Cluster Database page displays these metrics in separate section headings for each target. You can navigate to more detailed pages that display metrics about the target that you have selected by clicking the names of individual targets on the page. You can easily view all of the instance targets by clicking these links without navigating to the database and ASM instance detailed home pages.
You can monitor various activities in your cluster database environment with the other pages in Oracle Enterprise Manager that this section describes. The Cluster Database Performance page, that you access by clicking the Performance tab from the Cluster Database Home page, provides a brief summary of the performance statistics for all of the instances of the database.
In other words, statistics are rolled up across all of the instances in a RAC database and shown on the Database Performance page. Using the links that are next to the charts at the bottom of the page, you can drill down to perform the following tasks:. For performance information about individual instances, you can use the Cluster Database Instance Performance page.
To reach this page for a particular instance, click the Performance tab on the Cluster Database Home page, then click the name of the instance that you want to monitor at the bottom of the page.
You can drill down from links beside the charts or at the bottom of the Database Instance Performance page to perform the following tasks:. Use the Cluster Performance Page to see utilization statistics, such as CPU, Memory, and Disk reads and writes, during the past hour for all of the nodes of your cluster.
Access the Cluster Performance page by clicking the Cluster link in the General section of the Cluster Database Performance page, then click the Performance tab from the Cluster Home page. They cannot manage any kind of downtime within their conditions. These desires are certainly not separated to just databases yet consist of different critical components prefer servers, networks, customer connections and so on.
Well, we have a requirement for an intelligent resource supervisor that can redirect incoming workloads effectively to nodes which can be nonproductive or sometimes more competent relating to computing power and storage. The Oracle RAC Category of Solutions offers a fine-tuned item package to make sure all of these wants will be fulfilled. Reach grips with the simple virtualization by using VirtualBox.
If you are working with Linux, it will understand to be more knowledgeable about fundamental Linux system administration prior to moving forward.
The combination of virtualization and Linux system administration will assist quite a lot when doing RAC installation as well as, figuring out problems. The majority of the essential ASM skills could be learned on single instance systems. Make an effort setting up different types of RAC on different operating-system types. You can strike complications, however, handle this kind of learning ideas. Oracle is usually similar to SQL Server and each additional relational database system. Although Oracle RAC continues to support many third-party clusterware products on specific platforms, you must also install and use Oracle Clusterware.
Note that the servers on which you want to install and run Oracle Clusterware must use the same operating system. Using Oracle Clusterware eliminates the need for proprietary vendor clusterware and provides the benefit of using only Oracle software. In addition, Oracle Database features, such as Oracle Services, provide advanced functionality when used with the underlying Oracle Clusterware high availability framework. Oracle Clusterware has two stored components, besides the binaries: The voting files, which record node membership information, and the Oracle Cluster Registry OCR , which records cluster configuration information.
Voting files and OCRs must reside on shared storage available to all cluster member nodes.
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