RAC Node Affinity with Parallel Instance Groups

A reader asks: 

Question: I want to load balance my RAC system, and I was considering using node affinity approach.  I also understand that RAC has a parallel instance groups feature for RAC balancing.  What are the advantages of each approach?

The expert says:

Answer: There are several approaches to partitioning a RAC cluster with the most popular being functional load balancing, which involves dedicating like-minded transactions to the same node.  The process of assigning specific users and transactions to specific RAC instances is called instance affinity.

The main approaches are:

1.    RAC Instance Affinity

2.    RAC CPU Processor Affinity

3.    RAC Parallel Instance Groups

The use of parallel instance groups allows control over which instances allocate parallel execution server processes with instance groups. Each active instance can be assigned to at least one or more instance service groups. By activating a particular service group of instances, the instances that spawn parallel processes can be dynamically controlled.

Instance group membership can be established on an instance-by-instance basis by setting the instance_groups initialization parameter to a name representing one or more instance groups.

Follow the link below for further insights on RAC node affinity with parallel instance groups:

http://www.dba-oracle.com/t_rac_node_affinity_parallel_instance_groups.htm


*****************************************
Spot hidden Oracle performance trends!

Using the principles of decision support systems technology, BC has developed an important new Oracle tuning tool, Ion for Oracle. Ion quickly isolates the reports on the important optimization issues, separating the wheat from the chaff like no other performance tuning software.

After several years of hard work, Ion for Oracle is finally available for general release. Ion is unlike any other Oracle tool on the market, a tool that encapsulates expert techniques to allow a DBA to quickly visualize important trends and signatures.

Predictive analytics is the key to repairing Oracle problems before they cripple your database, and I created Ion for Oracle to allow any DBA to quickly identify changing workloads and unobtrusive patterns of data access. To try Ion for free:

http://www.ion-dba.com 

*****************************************

Need a Health Check?

Oracle is the world's most complex and robust database and there are hundreds of sub-optimal settings that can cripple your database performance.

Burleson Consulting has a great Oracle health check where we identify all database bottlenecks to ensure that your mission critical system is running at optimal speeds.

Just call 800-766-1884 to schedule your health check.

*****************************************

Need Oracle Training?

The very best Oracle training comes from Burleson Consulting, where you get an on-site visit by an experienced Oracle expert and author. Whether it's one-on-one mentoring or getting a customized on-site Oracle training class, there is no substitute for BC Oracle training. Just call 800-766-1884 for details, and check out our on-site Oracle training catalog at the following link:

http://www.dba-oracle.com/bc-catalog.pdf 

*****************************************

There's Always Room at the Top

Burleson Consulting continues to grow as the Oracle community recognizes that high quality Oracle support and training is a cost effective option in these tough economic times.

If you have distinguished yourself in your Oracle career and are ready to step up and enjoy the rewards of joining the ranks of America's top tier support consultants we would like to hear from you.

Evidence of high achievement as an Oracle professional might include publication of books and articles for the Oracle community, achieving an advanced degree from a competitive university and seeking out hands-on experience with complex databases. Follow the link for details and a full qualifications list:

http://www.dba-oracle.com/jobs.htm