I don't have any documented references to numbers, but if I come across any, I'll post them.
One thing about numbers -- each company puts their own spin on them and each say they have so much marketshare, etc. (I have a friend who did a statistics masters thesis on something like "you can prove anything if you re-arrange the data a certain way...)
But as my non-scientific gut feeling, I'd say Oracle has an overwhelming market share of small to midsize databases for transaction processing OLTP applications, i.e. web servers. Microsoft SQL server is maybe the closest competitor?? These are the more common run-of-the-mill interactive databases, lots of tools, widespread knowledge, visibility, recognizability.
I think NCR has an overwhelming marketshare of very large databases (> 1 terabyte) for data warehouse, decision support, analytical processing applications. Closest competitor is IBM DB2. These are the big enterprise databases behind closed doors, users are CEOs, CIOs, business operations & strategic planning. Instead of programming tools, it's much more a case of system integration and building a business IT infrastructure. Therefore Teradata is much lesser known to the masses.
Don't know much about Informix or Sybase, but my impression is they are non-factors in either scenario, and losing marketshare. Maybe they have their niches, but I don't know what that is. |
