How to enable archive mode in Oracle?

To enable the archiving mode of Oracle database, you can follow these steps:

1. Log in to the administrator account of the Oracle database.
2. Check if the current database is already in archive mode. You can use the following command to query:
3. Display a list of archived transaction log files.
4. If the “Automatic archival” output displays “Enabled,” it means the database is already in archive mode; if it shows “Disabled,” it means the database has not yet been enabled for archive mode.
5. If the database has not yet been enabled for archive mode, you can switch it to archive mode using the following command:
6. Switch to archiving mode for the database.
7. This will enable the database’s archiving mode.
8. Verify if the archive mode has been successfully enabled. You can use the following command again to check:
9. Please provide a list of archived logs.
10. Ensure that “Automatic archival” is displayed as “Enabled”.

Note: When archive mode is enabled, Oracle database will automatically store database log files (redo log) in the archive log directory for data recovery and backup operations. If the archive log directory does not have enough space or cannot write, the database may temporarily halt write operations. Therefore, before enabling archive mode, ensure that the archive log directory has enough available space and correct read/write permissions.