Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 
 Home
 E-mail Us
 Oracle Articles
New Oracle Articles


 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog


 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Analysis
 Design
 Implementation
 Oracle Support


 SQL Tuning
 Security

 Oracle UNIX
 Oracle Linux
 Monitoring
 Remote s
upport
 Remote plans
 Remote
services
 Application Server

 Applications
 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S
upport  
 Development  

 Implementation


 Consulting Staff
 Consulting Prices
 Help Wanted!

 


 Oracle Posters
 Oracle Books

 Oracle Scripts
 Ion
 Excel-DB  

Don Burleson Blog 


 

 

 


 

 

 
 

Find corrupt blocks in Oracle

Oracle Database Tips by Donald BurlesonFebruary 28, 2015

Question:  I see an Oracle data block corruption in my alert log:


Hex dump of (file 6, block 88337) in trace file /d01/app/oracle/diag/rdbms/uat/trace/TESTUAT_dbw0_4469.trc
Corrupt block relative dba: 0x0181435911 (file 6, block 437)
Bad check value found during buffer corrupt after write
Data in bad block:

How do I find the corrupt blocks in Oracle?.

Answer:  Oracle corruption is most frequently caused by a bad disk, although there are rare cases of "logical" corruption within the Oracle data blocks.  You can use these steps to find the corrupt data blocks in Oracle.  Oracle also provides a v$database_block_corruption view that you can check:

select * from v$database_block_corruption

If this is a production or test database, your first call should be to get the disk repaired and restored (if applicable) and to open a severity "one" service request on MOSC

If you know the file number and block number you can run the following query to see the exact data block that has corruption:

select
   relative_fno,
   owner,
   segment_name,
   segment_type
from
   dba_extents
where
   file_id = 6
and
   437 between block_id and block_id + blocks - 1;

Once you know the exact block ID you can view the corrupt block contents with the BBED utility, working with Oracle technical support.

Also see these related notes on repairing corrupt blocks.

Oracle also provides many ways to find corrupt blocks, dbv, rman and dbms_repair:

Using rman to find corrupted blocks:

RMAN corrupted_blocks.htm

Using dbv to find corrupt blocks

Using db verify to find corruption

Find corrupt blocks with dbms_repair

Using dbms_repair to detect corruption

Also see my related notes:

Repair corrupt blocks

   
Oracle Training from Don Burleson 

The best on site "Oracle training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!

Oracle training
 
 


 

 

Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


                    









Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


 

Copyright © 1996 -  2017

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.

Remote Emergency Support provided by Conversational

 

 

��  
 
 
Oracle Training at Sea
 
 
 
 
oracle dba poster
 

 
Follow us on Twitter 
 
Oracle performance tuning software 
 
Oracle Linux poster