I guess you know how to find object based on file and block:

SELECT segment_name , segment_type , owner , tablespace_name
FROM sys.dba_extents
WHERE file_id = &bad_file_id
AND &bad_block_id BETWEEN block_id and block_id + blocks -1

but I think what you are asking is to how to read blockdump.

Check my paper on Oradebug at
http://www.evdbt.com/Oradebug_Modrakovic.pdf

and then do few dumps .. for table and for index too.

Open trace file and search for:

Seg/Obj ( Seg/Obj Id ) and Typ: 1- Data 2 – Index

Remember things change with every new Oracle version.

Look online and you will find description of formated block dump.

Miladin

I have few questions

1. How to determine block type. Like is this data(table) or index or redo block.

2. And from that block dump how to identify object.

Lets say i had corruption in file 56, 56789 (block)

I can blockdump this block but how to answer my 1 and 2 point from this.

Can you please explain.