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Oracle RAC Database Resonance

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%.

Resources are dynamically expanded when needed and shrunk when not needed or when priority tasks are in need of those resources. Database Resonance is the provisioning utility for the Oracle RAC.

Through the database resonance utility, it becomes possible for the administrators to define and configure the policy-based CPU provisioning (in terms of nodes) and capacity on demand with automatic load balancing. DBA(s) can define the services-level policies based on CPU utilization or service response times and also set up priority of each database. Oracle automatically starts and stops the additional instances to meet service-level policies

Data Provisioning

In a multiple database scenario in the grid architecture, data may need to be moved from one database to another. In the case where all the database or data resources cannot be consolidated or pooled, active data sharing can be utilized by moving data from over-utilized databases to under-utilized databases. Sometimes the target database may be put to use for a particular purpose or particular department.

In order for the most optimum and efficient data transfers to occur, Oracle provides many new features like Oracle Streams, Transportable Tablespaces, Oracle data pump, distributed SQL support, distributed transactions, and gateways.

11g Grid provisioning

The Oracle grid control provisioning pack allows you to "blow-out" a RAC node without the time-consuming install, using a pre-installed "footprint". Prior to 11g, the DBA could simply install a binary footprint for the software (which is tar'ed to the server blade), without a cumbersome install process. The pre-configured footprint is link edited and ready to go, making it easy to deploy new Grid servers.

This paper titled Provisioning RAC and AS using OEM, we see that RAC provisioning has several sub-components:

"Behind the scenes, provisioning a RAC system is a combination of the following technologies:

Cloning of ORACLE_HOME

Cloning of a single instance database

Converting a single instance database to RAC".

Bare Metal and Gold provisioning for Oracle RAC

We see several new terms in the Oracle 11g documentation referring to "gold" and "bare metal" provisioning. In Oracle jargon, all ?gold images? are pre-installed, tested and approved software images that can be patched to any level before deployment. We see that "gold images" are a play on words from Linux "bare metal" provisioning:

"On Linux machines the operating system and the agent software can also be deployed using the Bare Metal provisioning process introduced in 10gR2. The Bare Metal provisioning process makes use of the PXE technology to boot a ?kickstart image? of the operating system."

This RAC provisioning features started within OEM in 10gr3, and it allows a Grid DBA to add a new RAC node with a single mouse click. Oracle notes that you can provision a new node with just a mouse click, but only after the procedure has been set-up:

"All the complexities of provisioning and configuring the agent, Clusterware, storage, network and the database software are automated and hidden from the end user. One can retire the node entirely or relocate the node with a similar single click effort."


provision a new server:

0 - Specify the kernel parameters.

1 - Configure block devices for Oracle Clusterware devices.

2 - Ensure you have set the block device permissions correctly.

3 - Use short, nondomain-qualified names for all names in the Hosts file.

4 - Test whether or not the interconnect interfaces are reachable using the ping command.

5 - Verify that the VIP addresses are not active at the start of the cloning process by using the ping command (the ping command of the VIP address must fail).

6 - Run the Cluster Verification Utility (CVU) to verify your hardware and operating system environment.

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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