What database do you use the most each day? Macintosh users will most often say FileMaker. Windows users will most often say Access. Both are wrong. The database most people use every day is MySQL followed by SQLite. MySQL powers most of the websites in the world including Facebook. SQLite is an embedded database found in Apple's Mail program for one. How often do either of those fail? Rarely if ever. There's good technical reasons for that like having failover servers. All in all they work reliably each day, every day.
Free and open source database systems have matured and, for the most part, have become much easier to deploy, manage, maintain, and work with. Read more about these database systems and then talk to use about a solution that may be right for you.