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ORA-01578: ORACLE data block corrupted  Tips

Oracle Tips by Burleson Consulting

April 7, 2011

Question:  Please give me solution for below error during Oracle startup command:

  ORA-01092: ORACLE Instance terminated. Disconnected forced

My alert log shows these errors:

Errors in file g:\oracle\product\10.1.0\admin\hrdev\udump\hrdev_ora_196.trc:
ORA-01578: ORACLE data block corrupted (file # 1, block # 57371)
ORA-01110: data file 1: 'G:\ORACLE\PRODUCT\10.1.0\ORADATA\HRDEV\SYSTEM01.DBF'

Error 1578 happened during db open, shutting down database
USER: terminating instance due to error 1578
Thu Apr 07 10:06:54 2011
Errors in file g:\oracle\product\10.1.0\admin\hrdev\bdump\hrdev_pmon_860.trc:
ORA-01578: ORACLE data block corrupted (file # , block # )

Thu Apr 07 10:06:54 2011
Errors in file g:\oracle\product\10.1.0\admin\hrdev\bdump\hrdev_mman_1660.trc:
ORA-01578: ORACLE data block corrupted (file # , block # )

Thu Apr 07 10:06:54 2011
Errors in file g:\oracle\product\10.1.0\admin\hrdev\bdump\hrdev_reco_828.trc:
ORA-01578: ORACLE data block corrupted (file # , block # )

Thu Apr 07 10:06:54 2011
Errors in file g:\oracle\product\10.1.0\admin\hrdev\bdump\hrdev_ckpt_4064.trc:
ORA-01578: ORACLE data block corrupted (file # , block # )

Thu Apr 07 10:06:54 2011
Errors in file g:\oracle\product\10.1.0\admin\hrdev\bdump\hrdev_dbw0_3076.trc:
ORA-01578: ORACLE data block corrupted (file # , block # )

Thu Apr 07 10:06:55 2011
Errors in file g:\oracle\product\10.1.0\admin\hrdev\bdump\hrdev_lgwr_2508.trc:
ORA-01578: ORACLE data block corrupted (file # , block # )

Thu Apr 07 10:07:08 2011
Instance terminated by USER, pid = 196
ORA-1092 signalled during: ALTER DATABASE OPEN...

How to I diagnose and fix this ORA-01578 error?

Answer:  Since you are getting a ORA-01578 running Oracle on a personal computer (Windows), it's a safe bet that you have a disk crash.  Oracle is not designed to run on PC's, it was made for industrial strength servers.

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:

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

  • dbverify:  Running dbverify may help you locate the corruption: db_verify_tips

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).  The ORA-01092: ORACLE instance terminated error can be caused by many factors, and the alert log reveals the real cause:

- Running Oracle on Windows

- A shutdown abort

- Bad permissions of BDUMP, CDUMP or UDUMP directories

- Missing datafiles

- Data corruption

- Renaming files when Oracle is down

- and many other OS-related causes

In your case, the ORA-01578 block corruption error, with is related to the ORA-26040 corrupt block error:

ORA-01578: ORACLE data block corrupted

To diagnose the ORA-01578 error, use the oerr utility to look-up the ORA-01579 error:

ORA-01578: ORACLE data block corrupted (file # string, block # string)

Cause: The data block indicated was corrupted, mostly due to software errors.

Action: Try to restore the segment containing the block indicated.
This may involve dropping the segment and recreating it.
If there is a trace file, report the errors in it to your ORACLE representative.

Normally, block corruption is often due to a hardware error, and there is likely a trace file or log entry that was made when it happened.  By examining the trace file, you can often tel the root cause of the corruption, or an Oracle Representative must now tell you the root cause of the corruption.
 
Beware, you may need to perform an RMAN recovery on this database, up to the point of the corruption, usually a disk failure.

Open an SR IMMEDIATELY with MOSC.  Oracle technical Support can use the block editor (BBED) utility to inspect the data blocks and see EXACTLY why they became corrupted. You can also inspect the blocks with BBED yourself.
 
For additional information on handling corruption, see the BC expert notes on corruption and see MOSC Note 1088018.1 - Handling Oracle Database Corruption Issues.
 
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