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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:

   file_id = 6
   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

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