| Description | Required for startup | |
| Control files | Metadata about data files and online redo log files (names, status etc.) | ✓ |
| Parameter file | Configuration of instance | ✓ |
| Online redo log file | Used for data recovery | ✓ |
| Automatic Diagnostic Repository (ADR) | Traces, dumps, alerts, health monitor reports | |
| Backup files | Used for database recovery | |
| Archive Redo Log Files | Used for recovery of restored data files | |
| Password File | ||
| Wallets | ||
| Block Change Tracking File | ||
| Flashback Logs |