SQL BACKUP DATABASE
Here is a clear, practical, and DBA-friendly guide to the SQL BACKUP DATABASE command, including syntax for SQL Server, MySQL, PostgreSQL, and Oracle.
What SQL BACKUP DATABASE Does
A database backup creates a copy of the database’s data and logs, allowing you to restore the system after:
Hardware failures
Human errors
Data corruption
Migrations
Deployments
Important: Only SQL Server supports the actual BACKUP DATABASE command.
Other DB engines use different tools (explained below).
SQL Server — BACKUP DATABASE (FULL, DIFFERENTIAL, LOG)
Full Backup
Differential Backup
(Only changes since last full backup)
Transaction Log Backup
(Only for FULL or BULK_LOGGED recovery models)
Backup to Multiple Files
Verify Backup
MySQL — Database Backup (No BACKUP DATABASE Command)
MySQL does not support BACKUP DATABASE.
Use one of these:
mysqldump
Logical backup of a single table
Physical Backup (hot backup)
Use Percona XtraBackup:
PostgreSQL — Database Backup
PostgreSQL also does not support BACKUP DATABASE.
Use the backup utilities:
pg_dump — logical backup
pg_dump for compressed backup
pg_basebackup — physical full backup
Oracle — Backup (RMAN)
Oracle backups are done using RMAN, not SQL.
Full backup
Backup with archive logs
Backup Types Summary
| DB Engine | Full Backup | Differential | Log Backup | Hot Physical Backup |
|---|---|---|---|---|
| SQL Server | Yes | Yes | Yes | Yes |
| MySQL | Via mysqldump/XtraBackup | No | No | XtraBackup |
| PostgreSQL | Via pg_dump | No | WAL archiving | pg_basebackup |
| Oracle | RMAN | RMAN | RMAN | RMAN |
Best Practices for Backups
- Automate backups (cron, SQL Agent, systemd)
- Store backups off-server
- Encrypt backups for sensitive data
- Test restores regularly
- Keep a retention policy
- Use timestamped backup filenames
- Monitor backup size + duration
Example (SQL Server):
