Question 11 :
When a user process fails, what background process cleans up after it?
Question 12 :
What background process refreshes materialized views?
The Job Queue Processes.
Question 13 :
How would you determine what sessions are connected and what resources they are waiting for?
Use of V$SESSION and V$SESSION_WAIT
Question 14 :
Describe what redo logs are.
Redo logs are logical and physical structures that are designed to hold all the changes made to a database and are intended to aid in the recovery of a database.
Question 15 :
How would you force a log switch?
ALTER SYSTEM SWITCH LOGFILE;