To answer this question, you need to understand the purpose and functionality of redo log files in a database.
Redo log files are a crucial component of a database system. They record all changes made to the database, allowing for recovery in the event of a system failure. When a redo log file becomes corrupted while the database is open, it is essential to address the issue to ensure data integrity.
Let's go through each option to understand why it is correct or incorrect:
Option A) Clear the redo log group - This option is correct. Clearing the redo log group involves removing the corrupted redo log file(s) and creating new ones. By doing this, you ensure that the database can continue to operate with a clean set of redo log files.
Option B) Perform redo log file import - This option is incorrect. Redo log file import is not a valid solution for dealing with a corrupted redo log file. Importing redo log files is typically used when restoring a database from a backup.
Option C) Perform an incomplete recovery - This option is incorrect. Incomplete recovery is used when restoring a database to a specific point in time but does not address a corrupted redo log file issue.
Option D) Perform a redo log recovery using Recovery Manager (RMAN) - This option is incorrect. While RMAN is a powerful tool for database recovery, it is not specifically designed to handle a corrupted redo log file issue.
Option E) Shut down the database and open the database in the NOARCHIVELOG mode - This option is incorrect. Shutting down the database and operating it in NOARCHIVELOG mode does not directly address the issue of a corrupted redo log file.
Therefore, the correct answer is A) Clear the redo log group. Clearing the redo log group allows for the removal of the corrupted redo log file(s) and the creation of new ones, ensuring the integrity of the database.