Which role is automatically assigned to the old primary database after a successful switchover to a logical standby database?

Can a read-only standby database be used for reporting and analytics?

What is a switchover operation in an Oracle Data Guard configuration?

You must propose an Oracle Data Guard configuration for a database supporting an OLTP workload that meets these permanent requirements:Data loss is not permitted.Read-only applications should not connect to the primary database instance.Additionally, there are these requirements, only one of which is ever done at any one time: It should be possible to apply and test designated patches with a minimum amount of downtime.Upgrading to a new database release should be performed with the least possible amount of downtime.New application software releases should be tested against an exact up-to-date replica of the production database.You propose a primary database with one physical standby database configured in Maximum Protection mode. Which requirements do you meet? 

Which listener configuration file is used to specify the network connection parameters for the databases in a Data Guard environment?