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How to Recover from errors ORA-01171 ORA-01122 ORA-01251 ORA-01186 (Doc ID 333620.1)

Last updated on APRIL 22, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 8.1.7.4 and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.


Symptoms


Corruption reported while reading datafile header.

Alert log shows messages like:

 

Cause

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In this Document
Symptoms
Cause
Solution
 Option 1:  Restore the Datafile from Backup
 Option 2:  Backup of Datafile is not available but all archived logs from creation date of the datafile are available.
 Option 3:  Backup of Datafile and archived logs are not available

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