Which Oracle background process is responsible for instance recovery after a failure?A) DBWnB) LGWRC) SMOND) PMON

To determine which Oracle background process is responsible for instance recovery after a failure, we can analyze the functions of each of the listed processes:

1. DBWn (Database Writer): This process is responsible for writing data from the buffer cache to the data files on disk. It does not handle instance recovery.

2. LGWR (Log Writer): This process is responsible for writing redo log entries from the redo log buffer to the online redo log files. While it plays a crucial role in data recovery, it is not directly responsible for instance recovery after a failure.

3. SMON (System Monitor): This background process is responsible for instance recovery after a failure. It checks for instance failures and then performs recovery operations to ensure database consistency. SMON is crucial in the event of an instance crash to apply necessary redo logs and recover the database.

4. PMON (Process Monitor): This process monitors other processes and cleans up resources when a user process fails. It does not handle the recovery of instances.

Final Answer

The correct answer is C) SMON, as it is responsible for instance recovery after a failure.