How to back up database data in oracle
Oracle database provides three backup methods: Full database backup: Copy the entire database file and log file. Incremental backup: Only data blocks that have changed since the last backup are backed up. Archive log backup: records all changes to the database for recovery.
Oracle database backup methods
Oracle provides a variety of methods to back up database data, including full database backup , incremental backup and archive log backup.
Full database backup
A full database backup creates a copy of the database files and log files. You can perform a full database backup using the following command:
<code>RMAN> backup database;</code>
Incremental backup
Incremental backup only backs up the data blocks that have changed since the last backup. Incremental backups can be faster than full database backups. Incremental backups can be performed using the following command:
<code>RMAN> backup incremental backup;</code>
Archived log backup
Archived log backup is the cornerstone of Oracle's backup and recovery strategy. Archive logs contain records of all changes made to the database. Logs can be archived using the following command:
<code>RMAN> archive log sequence number;</code>
Backup strategy selection
The best backup strategy depends on the size of the database, activity level, and recovery time objectives. The following are some common backup strategies:
- Perform a complete database backup every day and incremental backup once a week: Suitable for small and medium-sized databases.
- Perform weekly full database backups and daily incremental backups: Suitable for large databases or databases with high activity levels.
- Continuous archive log backup: Suitable for critical databases that require the shortest recovery time.
Implementation Steps
To implement a backup strategy, follow these steps:
- Determine the required backup strategy.
- Configure RMAN (Recovery Manager) to automatically perform backups.
- Monitor backups regularly to ensure their success.
- Test restores regularly to verify the effectiveness of your backups.
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