How to backup and restore a database in Oracle?
To back up and restore an Oracle database, follow these steps:
Backup database.
- Backup using Oracle’s backup tool like RMAN (Recovery Manager), or using a physical backup method, such as using file system tools to back up database files.
- Before backing up the database, it is recommended to conduct a thorough integrity check to ensure the database is error-free and undamaged. This can be done using the DBVERIFY tool.
- According to the backup strategy, you can choose to do a full backup (including data files, control files, and log files) or an incremental backup (only backing up files that have changed).
Restore database:
- Before conducting database recovery, it is necessary to confirm the integrity and availability of the backup files. The backup validation tool provided by Oracle can be used for verification.
- To restore the entire database, the RMAN tool can be used. Begin by starting the database instance and then connecting to the RMAN command line interface. Use the RESTORE command to restore the backup data files, followed by the RECOVER command to recover the database.
- If you only need to restore a specific tablespace or data file, you can use RMAN’s tablespace recovery or data file recovery command for the restoration.
- Once the database recovery is complete, you can perform an integrity check to ensure that there are no errors or damages in the database. This can be done using the DBVERIFY tool.
It is important to note that when performing database backup and recovery, it is crucial to ensure that the database instance is in archivelog mode and that archiving of logs is enabled. Additionally, backup and recovery operations should be carefully executed, and it is recommended to perform validation in a test environment to prevent irreversible impacts on the production environment.
