How to restore oracle database
The Oracle database recovery process involves: determining the type of recovery (full or incomplete); ensuring regular backups; selecting a recovery method (database file recovery, archived redo log recovery, or flashback query); preparing the recovery environment; executing Recovery operations; test and verify recovery; restart database.
Oracle Database Recovery
Oracle Database Recovery is the recovery of a database from an unexpected event or damage to a previous state the process of. It involves the following steps:
1. Determine the recovery type
- Full recovery: Restore the entire database to a specific point in time.
- Incomplete recovery: Only restore a specific part of the database.
2. Backup strategy
- Ensure that the database is backed up regularly.
- Determine the availability and appropriateness of the backup type (such as cold backup, hot backup).
3. Select the recovery method
- Database file recovery:Use the REBUILD DATABASE or RECOVER DATABASE command to recover damaged or lost files document.
- Archived redo log recovery: Use RMAN (Recovery Manager) to use archived redo logs to recover the database.
- Flashback Query: Use Flashback technology to query previous versions of the database.
4. Prepare the recovery environment
- Make sure the database is mounted.
- Close all open user sessions.
- Get backup files and archived redo logs.
5. Perform the recovery operation
- Use the appropriate method to perform the recovery operation.
-
For database file recovery:
- Use the REBUILD DATABASE command to rebuild the database.
- Use the RECOVER DATABASE command to recover specific files.
-
For archived redo log recovery:
- Use RMAN to specify the recovery target point in time (RPO).
- Perform recovery operations.
-
For flashback query:
- Use Flashback query syntax to query the database at a specific point in time.
#6. Testing and Verification
- After recovery, test the database to ensure its integrity and consistency.
- Run queries, verify data, and check logs to verify recovery was successful.
7. Restart the database
- After the recovery is complete, restart the database to make it available to users.
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