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RAC for performance, D/R and integration with SAP R/3 |
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EXPERT RESPONSE FROM: Bill Cullen
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QUESTION POSED ON: 11 October 2006
- What's the deal on performance? I haven't heard a lot of good things.
- What is the implication of using RAC for D/R?
- Are there any issues with using RAC with Oracle integrated with SAP R/3?
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EXPERT RESPONSE
- I know there are different opinions out there, but for my money most
properly designed, properly configured RAC databases will not experience any
significant performance issues related to RAC in and of itself. Is there
overhead? Yes. But I believe that it is more than manageable given adequate
hardware resources and a well-planned architecture configuration. I have
supported dozens of RAC environments, and performance issues resulting from
the product itself have never been a major problem.
- RAC is more of an availability solution as opposed to a disaster recovery
solution in the traditional sense of the term. Yes, it allows continued
operation in the event of node failure but you still have the same control
file(s), the same system tablespace, etc. So a lot of your common disaster
scenarios remain the same. You still need to be in archivelog mode for
point in time recovery and these logs should be available to all instances.
You still need disk redundancy, backups, etc. Since most RAC servers sit
next to each other in the same data center, many sites opt for a combination
of RAC and Data Guard (off site) for a complete availability and disaster
recovery solution.
- I personally don't have experience with this but I know it is a supported
solution. Here is a presentation from someone who introduced RAC into their SAP R/3 environment.
Hope this helps,
Bill
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