I recently heard an Oracle Executive Vice President in Server Technologies development at Oracle cite RAC adoption at somewhere along the lines of 10,000 RAC deployments. He then balanced that number by stating there are on the order of 200,000 to 250,000 Oracle sites. Real Application Clusters has been shipping for just under 6 years now.
Real Application Clusters Adoption
There have been a lot of things standing in the way of RAC adoption. First, applications need to be tested to work with RAC. It took ages, for instance, to have even Oracle E-Biz suite and SAP certified on RAC. Second, if RAC doesn’t solve a problem for you, the odds are small you’ll deploy it. Third, RAC was introduced just prior to the major global IT spending downturn post-9/11, and RAC is not inexpensive. I’m sure there are third, fourth and many more reasons, some of which are centered more along techno-religious lines than purely technical.
I’ve been very involved with RAC since its initial release because my former company, PolyServe, helped some very large customers adopt the technology. All along I’ve been interested about any factors that hold back RAC adoption. In my personal experience, one significant factor is not really even a RAC issue. Instead, the difficulties in dealing with shared storage has historically put a bad taste in people’s collective mouths and technology like ASM only addresses part of the problem by handling the database—but none of the unstructured data necessary for a successful RAC deployment. That’s why I like NFS–but I digress.
In this post on the oracle-l email list, a fellow OakTable Network member posted an invite to participate in a poll regarding Real Application Clusters. It only has a few questions in order to garner as much participation as possible. I do wish, however, it would ask one very important question:
Why aren’t you using RAC.
I encourage all of you RAC folks to participate in the poll here: A Poll About RAC. Let’s get as much valuable information out of this as possible. If you have a minute, maybe you non-RAC folks can submit a comment about why you don’t use RAC.
At the top of the Poll webpage you can click to get the current results.