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Database Consolidation

Oracle RAC Cluster Tips by Burleson Consulting

This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters.  To get immediate access to the code depot of working RAC scripts, buy it directly from the publisher and save more than 30%.

Many enterprises are showing keen interest in data or database consolidation. For example, dozens of instances residing on several hosts or servers are merged into a large database. With a powerful server platform, abundant memory, and ample processor resources, it is common to establish a very large database (VLDB) that can accumulate terabytes of data.

Even in a packaged application environment, as in SAP, there is a tendency towards consolidating the databases to provide lower cost and better administrative flexibility.  A good example is the new approach taken by the SAP application suite that is called Multiple Components in One Database (MCOD).

MCOD is a new installation feature for components. It provides the capability of installing several components independently in one single database. Each component connects the database with one single database user.

Oracle VLDB has proven to be a good cost saving solution. It employs dynamic parallel processing techniques in accessing data sets and table partitions. Even from the administrative point of view, it makes more sense for management to have a smaller number of large databases than vice versa. This approach provides:

* Reduced TCO in terms of licensing, staffing, and consulting fees.

* Improved availability with the focus on fewer databases.

* Higher security.

* Centralized backup and archive.

RAC with Grid is an ideal solution to take advantage of these developments. RAC supports VLDB databases for data consolidation and large data warehousing databases.

E-business Applications

E-business applications are becoming a dominant category considering the steep growth of the use of Internet in commercial, retail, and entertainment businesses. E-business activity brought many challenging demands to IT management. The wide adoption of e-business as a way of commerce by the common public has resulted in a huge accumulation of data at these enterprises. Supporting these applications 24/7 has become the most important feature. It is common for thousands of concurrent users to access an e-business application and the associated database system.

As a result, the workload pattern has become almost unpredictable. There may be sudden spurts of commerce activity at any time. The days are gone when database systems were shutdown during the night and weekends for backups and other maintenance activities.

RAC databases, with the built-in multiple instance nodes and pay as you grow approach, are a good solution for meeting all these challenging developments.

The next section will cover the suitability of RAC databases for application deployment.

RAC Suitability

In a typical 2-tier or 3-tier application deployment, the back end tier consists of the database component, with the middle tier accessing the backend database resources. There are hardly any applications that do not depend on database resources. Whether it is a web-based e-commerce application, or an in-house client server application, or packaged applications like ERM and CRM, they all need database resources to store, retrieve, and update.

The Oracle RAC GRID enabled database is a very well positioned back end database that provides a scalable and highly available data storage platform. With its increased robustness and higher computing power, it provides a reliable back end database engine for mission critical applications needing higher throughput and shorter response times. Multi-instances and multiple nodes make it an enhanced and powerful database platform. Most applications can use this multi-node clustered database without any code modification. As a result, the acceptability of multi-instance RAC databases is very high among existing and stand-alone Oracle database users.


This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters, Rampant TechPress, by Mike Ault and Madhu Tumma.

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


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