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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