ORA-19815: WARNING: string of string bytes is string% used, and has string remaining bytes available.
Cause: DB_RECOVERY_FILE_DEST is running out of disk space.
Action: One of the following:
1. Add disk space and increase DB_RECOVERY_FILE_DEST_SIZE.
2. Backup files to tertiary device using RMAN.
3. Consider changing RMAN retention policy.
4. Consider changing RMAN archived log deletion policy.
5. Delete files from recovery area using RMAN.