Oracle database backup can be implemented through RMAN backup, export/import utility, and logical backup (Flashback). Restore principles vary according to the backup type, including: RMAN backup and restore, export/import export and restore, logical backup (Flashback) restore. The specific restore process involves starting the RMAN connection database, restoring the backup set using the RESTORE/RECOVER command, exporting/importing files, rebuilding and permissions, and using the Flashback command to restore to a specific point in time.
Oracle Database Backup and Restore
How to back up an Oracle database?
Oracle provides a variety of backup options, including:
- RMAN (Recovery Manager) Backup: Create backups with the RMAN command line tool that provide incremental and full backups.
- Export/Import Utility: Export the database object to a file and then import it to create a backup.
- Logical backup (Flashback): Use Flashback technology to create a database state backup for a specific time.
How to restore an Oracle database?
Depending on the backup type, the method of restoring an Oracle database varies:
- RMAN Backup: Use the RMAN command line tool to restore the backup.
- Export/Import Export: Use the import utility to import the exported files into the database.
- Logical backup (Flashback): Use Flashback technology to restore the database to a specific point in time.
Detailed restore process:
RMAN Backup Restore:
- Start RMAN and connect to the target database.
- Use
RESTORE DATABASEcommand to restore the backup. - Specifies the backup set to restore and its location.
- Run the
RECOVER DATABASEcommand to apply the redo log and redo committed transactions in the backup set.
Export/import export restore:
- Use the Export utility to export the database object to a file.
- Use the import utility to import the exported files into the target database.
- Recreate users and permissions using
CREATE USER,GRANTandALTER USERstatements.
Logical backup (Flashback) restore:
- Use the Flashback tablespace or Flashback database command to restore the database to a specific point in time.
- Any changes made after this point in time will be revoked.
- Use
SET TRANSACTION READ ONLYstatement to ensure consistent reading.
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