How to find physical corruption

Question

Hi,
I sed backup validate command to find physical corruption into my database as follows.
backup validate check logical database;
After his command, I queried v$database_block_corruption.
12:04:47 SQL> select * from v$database_block_corruption;
     FILE#     BLOCK#     BLOCKS CORRUPTION_CHANGE# CORRUPTIO
         1      11477          2          228760588 LOGICAL
         1      11514          1          228760329 LOGICAL
12:05:09 SQL>
How can I find if this is physical corruption of logical corruption?
I also used dbv command to check my system datafile (File# 1). And output is as foolows
D:\>dbv file=D:\ORACLE\ORADATA\OPERA\SYSTEM01.DBf
DBVERIFY: Release 10.2.0.4.0 - Production on Mon Nov 18 11:56:23 2013
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
DBVERIFY - Verification starting : FILE = D:\ORACLE\ORADATA\OPERA\SYSTEM01.DBf
DBV-00200: Block, DBA 4205781, already marked corrupt
DBV-00200: Block, DBA 4205782, already marked corrupt
DBV-00200: Block, DBA 4205818, already marked corrupt
DBVERIFY - Verification complete
Total Pages Examined         : 168960
Total Pages Processed (Data) : 127180
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 25248
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 2440
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 14092
Total Pages Marked Corrupt   : 3
Total Pages Influx           : 0
Highest block SCN            : 245793757 (0.245793757)
Since dbv always checks for physical corruption, but how can I make sure by using RMAn that whether this is physical corruption of only logical corruption? Thanks
Alert log says something as follows
Sat Sep 14 00:22:50 2013
Errors in file d:\oracle\admin\opera\bdump\opera_p008_3916.trc:
ORA-01578: ORACLE data block corrupted (file # 1, block # 11478)
ORA-01110: data file 1: 'D:\ORACLE\ORADATA\OPERA\SYSTEM01.DBF'
ORA-10564: tablespace SYSTEM
ORA-01110: data file 1: 'D:\ORACLE\ORADATA\OPERA\SYSTEM01.DBF'
ORA-10561: block type 'TRANSACTION MANAGED DATA BLOCK', data object# 5121
ORA-00607: Internal error occurred while making a change to a data block
ORA-00600: internal error code, arguments: [kddummy_blkchk], [1], [11478], [6101], [], [], [], []
SAQ

Answer 1

Hi,
DBVerify reports both physical and logical intrablock corruptions by default. A good place to start would be going through the below MOS note for understanding them well.
Physical and Logical Block Corruptions. All you wanted to know about it. (Doc ID 840978.1)
Basically you will not be able to read data from the corrupt blocks in physical corruption while might be able to read data in logical corruption.
Also, DBVerify reports DBV-200/201 errors for logical corruption.
Hth
Abhishek