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Identify the Corruption Extension for Block Corruption, Table/Index Inconsistency, Data Dictionary and Lost Writes (Doc ID 836658.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


The purpose of this article is to describe in a single note how to identify the most common corruptions/inconsistencies in Oracle 10g or above.


Corruption Types

There are several types of corruptions like:

  • Datafile Block Corruption - Physical/Logical
  • Table/Index Mismatch
  • Extents Inconsistencies
  • Data Dictionary Inconsistencies

The next section is intended to describe the tools used to detect corruption for each corruption type.


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In this Document
 Corruption Types
 Datafile Block Corruption - Intra block corruption
 RMAN - Identify Datafile Block Corruptions
 DBVerify - Identify Datafile Block Corruptions
 RMAN Vs DBVerify - Datafile Intra Block Corruption
 Identify TABLE / INDEX Mismatch
 Identify Extents Inconsistency in Locally Managed Tablespace
 Identify Extents Inconsistency in Dictionary Managed Tablespaces
 Identify Data Dictionary Inconsistency
 Identify corruption caused by LOST WRITES

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