Asking this question is rather old hat.....

We have a major project that we are about to start with implementing a document management system. In the past we generally use Oracle for most projects. However since this new system is a shared support system, there is a strong push from other IT group to use SQL server. We were looking to implement RAC or Active Data Guard. Opposition states similar features can be had in sql server enterprise edition for total cost that is much less than Oracle. DMS vendor states that 85 to 90% of DMS's that they install are on SQL server. In their opinion SQL server has come a long way and is much more reliable/capable than it was 10 years ago. I have to admit the price difference is substantial.
Objective comments please. This topic can get rather emotional responses......

Bob T. wrote:
what do you mean by 500 largest and fastest computing platofrms? Are these systems in industry, government, etc?As Mark said, these are the top 500 (www.top500.org) computer clusters in the world. They cover various industries, from research to nuclear physics. One of them is actually next door here (not very high up the list, but afaik the only one in Africa). We use similar basic architecture as they do (ito shared storage and Interconnect).
What I find interesting is that most/many people I deal with, sees Linux as a hobbyist o/s or something. A few years ago Oracle asked me to talk RAC to one of their clients and explain it from a fellow customer perspective. This customer (a large bank) was totally oblivious to Linux. It was either Unix (think they were a AIX or HP-UX shop) or Windows. They thought of Linux as small - something you run a web server on. Not that robust and not that scalable.
Showing them the top500 stats wrt o/s families, was like dropping a bomb shell. They had no idea that Linux is by a significant factor the major player in the HPC (high performance computing) market. And that the o/s's they used for HPC in their environment did not even feature.
Of course, changing corporate views and strategy are not easy. Early in the 2000's, I managed to wangle Linux as an o/s for production RAC because of budget constraints. HP-UX, Solaris and Windows were the preferred o/s's. Slowly Linux became the choice o/s (unofficially) for new servers in my environment. The same were happening in other regions and departments of the large corporate. Today, Linux and Windows are the preferred o/s's as per corporate IT strategy.
When it comes to high-end database processing (TB databases, crunching large volumes of data), it makes sense to look at what technologies are used in HPC. Windows and SQL-Server? I would not put my data eggs in that basket.

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