We say Derby is not a good choice in production but don't explain why. What constraints does it have? Where is Derby appropriate? Help the user decide.

Provide more guidance on choosing a database (persistent storage):

• Question raised in a forum post: What is the use of MySQL
• Why not Derby in production? Where can you use it?
• General database recommendations
  • Use the database system where most knowledge is available in your organization.
  • Use MySQL if an open source DBMS should be used and there is no deeper DB knowledge is available.
  • Use MySQL only with InnoDB Storage Engine.
  • Use PostgreSQL if you have already people / knowledge to handle it.
  • etc.