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Find oracle corruption

Oracle Database Tips by Donald BurlesonNovember 13, 2015

Question:  I do not see any errors being encountered, and when I restart the application, it works for a while and then starts reporting "ORA-01578 ORACLE data block corrupted.  How can I detect Oracle corruption?

Answer: Oracle corruption is quite rare, and when corruption occurs, it is usually due to bad hardware (disks).  Nonetheless, Oracle provides several tools to find Oracle corruption:

  • Data Recovery Advisor:  You can use the Oracle 11g Data Recovery advisor.
     

  • dbverify:  You can run dbverify  to identify the exact SYSAUX blocks with are corrupt. Once you do this and see which index resides in those blocks, you can simply rebuild the index to repair the corruption.

  • dbms_repair:  The Oracle dbms_repair utility will find the exact block that has corruption.

  • RMAN:  In RMAN you can issue the blockrecover command at the RMAN prompt, specifying the file and block numbers for the corrupted blocks.

  • dbms_repair:  One other option in dbms_repair.htm is to try dbms_repair.fix_corrupt_blocks.

  • BBED:  as a last resort you can work with Oracle technical support to use BBED  to repair the corruption.

After you find the Oracle corruption, you can use the BBED utility to edit the corrupt data block (with the aid of Oracle technical support).

Also see my notes on the ORA-01578 data block corrupted.

 
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