Umbrella issue for collecting topics

• Engine Operations
  • Database isolation levels
  • Considerations when using replicated databases
  • Connection pool considerations (Dealing with closed connections, connection validation etc...)
  • Merge Database configuration (database type, "mariadb" ...)
  • The meaning of Optimisitc Locking Exceptions
  • UUID Generator
  • Load Balancer Considerations
  • Deadlocks
  • Update Considerations (No Rolling Updates etc.)
• Webapp considerations
  • Use of Http Session
  • Load Balancer and sicky session vs. session replication

Should be backported to older versions of the docs