RMAN (Recovery Manager) backup solutions for Oracle databases. RMAN is a powerful tool that simplifies backup, restore, and recovery tasks. Here are the key concepts and steps to get you started:
Understanding RMAN Backup Concepts:
- RMAN (Recovery Manager) is an Oracle Database client that automates backup and recovery tasks.
- It simplifies the process of backing up, restoring, and recovering database files.
- RMAN can back up various types of files, including data files, control files, and archived redo logs.
- When you execute the BACKUP command in RMAN, it generates either backup sets (proprietary format) or image copies (bit-for-bit copies of files). By default, RMAN creates backup sets.
Viewing Current RMAN Configuration:
- Before taking a backup, configure RMAN parameters. For example, set the retention policy and specify where to save backups.
- To view current RMAN configurations, connect to RMAN and execute the following command:
RMAN> SHOW ALL; - It displays various RMAN parameters and their current values.
Modifying RMAN Configuration Parameters:
- Backup Location:
Set the location where you want to save RMAN backups. For instance:
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT ‘/backup/rman/full_%u_%s_%p’; - Retention Period:
Specify how long you want to retain backups. RMAN automatically deletes old backups older than the retention period.
Example: Set the retention window to 7 days:
RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS; - Clear Parameter:
If you want to clear a parameter and set its value to default, use CLEAR at the end of the configuration as shown below.
RMAN> CONFIGURE RETENTION POLICY CLEAR;
Taking Backup:
To take a consistent backup of both the database and archive logs, use the following command:
RMAN> BACKUP AS BACKUPSET DATABASE PLUS ARCHIVELOG;