SchemaOnly

Some databases don't manage SchemaOnly behavior properly:

• MySQL, PostgreSQL and Oracle performs well only for queries that return some results - commands not returning any are executed as with Default behavior
  To overcome it, a special configuration flag has beed added (MakeDiagnosticCalls) that controlls SchemaOnly executions for commands without results and is by default set to false for mentioned databases
• MS SQL doesn't recognize temporary tables in SchemaOnly executions, although, you can use table variables instead