Yes and no. Oddly enough, Oracle has owned the most important part of mysql (innodb) for years, so them buying the rest of it was almost a benefit to have it all under one roof. They then went on to put out a very good release (5.5) that didn't suffer from the "don't use it till its in the teens" birthing pains that most previous releases did.
The thing is, most of the improvements in that release were really the work of a bunch of companies that had given up getting their patches accepted upstream and were trading around and maintaining their own patchsets. "The Google patches", "The Facebook patches", and "The Percona patches", etc. Mysql/Oracle brought their long stagnant release up to where the rest of the community had already gotten.
The nice thing is that means its already been proven that if they go dark and just squat on a stale code base for years, its not actually going to hold anything back.
The two things they have done are raise prices, and stop providing source code for new unit tests. Neither is a good thing, but they're pretty trivial in the overall scheme of things.
That isn't entirely fair to the InnoDB/MySql developers at Oracle - from what I've heard there has in general been an increase in development activity within Oracle. Some of that is merging patches from downstream, but most of the work has been on other improvements.
The thing is, most of the improvements in that release were really the work of a bunch of companies that had given up getting their patches accepted upstream and were trading around and maintaining their own patchsets. "The Google patches", "The Facebook patches", and "The Percona patches", etc. Mysql/Oracle brought their long stagnant release up to where the rest of the community had already gotten.
The nice thing is that means its already been proven that if they go dark and just squat on a stale code base for years, its not actually going to hold anything back.
The two things they have done are raise prices, and stop providing source code for new unit tests. Neither is a good thing, but they're pretty trivial in the overall scheme of things.