With most open source products we were building, even the language was open source, such as that which employs PHP. This is where the MySQL free version was being primarily used by many of the clients in the storing of their data.
There have been some great shoppers which we built with the solution. We use the solution to store the transactional data that we receive from various sites or have the data stored in MySQL.
The solution is easy to use. As the query patterns are very similar to SQL, this simplifies the use and understanding of the solution.
Integration is a key feature in need of improvement, as we have spent hours building this just to ensure that a set of data is exposed to a different client, a different world in need of that data. Since we are dealing with open source, which we are now employing in memory databases as well, it would be nice if they were to start thinking along those lines.
I have been dealing with MySQL for around a decade.
I have found the free version to be stable.
I have not made use of technical support.
I was not involved in either the installation or deployment strategy.
While I was not involved in those projects over the past year, we do have a couple of clients who choose to use the paid, enterprise version of the solution and who take full advantage of it.
While the solution has, nowadays, moved to the cloud, the one I have been dealing with is on-premises.
Even though the solution has not been off the market, I do not possess the exact figures of those making use of it. It is still being used by a couple of our clients.
I would recommend the solution to those interested in using the free, stable version of the solution which incurs no licensing costs.
I rate MySQL as a seven out of ten.
also with the new 5.7 edition added some other fixes , update, firewall , etc. You can check the new version on their page.