FIXING BLOCK CORRUPTION (RMAN) on 11G

FIXING BLOCK CORRUPTION (RMAN) on 11G

Assume: BLOCK CORRUPTION and DATABASE ARCHIVELOG MODE.

SQL> select file_name from dba_data_files where tablespace_name='USERS';

FILE_NAME
-------------------------------------------------------------------------------------------------------
---------------------------
/oracle/oradata/ORCL/datafile/o1_mf_users_5twzp1c3_new.dbf

$ dd if=/dev/zero of=/oracle/oradata/ORCL/datafile/o1_mf_users_5twzp1c3_new.dbf bs=8k
conv=notrunc seek=10 count=1
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 0.0631573 seconds, 130 kB/s

1. Using Data Recovery Advisor (by RMAN command)
Reference: http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/
backrec.htm#CNCPT1438
• list failure - to list any failures.
• advise failure - to display repair options for the specified failures.
• repair failure - to repair database failures identified.

RMAN> list failure;

using target database control file instead of recovery catalog
List of Database Failures
=========================

Failure ID Priority Status Time Detected Summary
---------- -------- --------- ------------- -------
1881 HIGH OPEN 14-APR-10 Datafile 4: '/oracle/oradata/ORCL/datafile/
o1_mf_users_5twzp1c3_new.dbf' contains one or more corrupt blocks

RMAN> advise failure;

List of Database Failures
=========================

Failure ID Priority Status Time Detected Summary
---------- -------- --------- ------------- -------
1881 HIGH OPEN 14-APR-10 Datafile 4: '/oracle/oradata/ORCL/datafile/
o1_mf_users_5twzp1c3_new.dbf' contains one or more corrupt blocks

analyzing automatic repair options; this may take some time
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=131 device type=DISK
analyzing automatic repair options complete

Mandatory Manual Actions
========================
no manual actions available

Optional Manual Actions
=======================
no manual actions available

Automated Repair Options
========================
Option Repair Description
------ ------------------
1 Perform block media recovery of block 10 in file 4
Strategy: The repair includes complete media recovery with no data loss
Repair script: /oracle/diag/rdbms/orcl/orcl/hm/reco_1500755688.hm

RMAN> repair failure;

Strategy: The repair includes complete media recovery with no data loss
Repair script: /oracle/diag/rdbms/orcl/orcl/hm/reco_1500755688.hm

contents of repair script:
# block media recovery
recover datafile 4 block 10;

Do you really want to execute the above repair (enter YES or NO)? YES
executing repair script

Starting recover at 14-APR-10
using channel ORA_DISK_1

channel ORA_DISK_1: restoring block(s)
channel ORA_DISK_1: specifying block(s) to restore from backup set
restoring blocks of datafile 00004
channel ORA_DISK_1: reading from backup piece /oracle/flash_recovery_area/ORCL/
backupset/2010_04_14/o1_mf_nnndf_TAG20100414T085114_5wb7ws6f_.bkp
channel ORA_DISK_1: piece handle=/oracle/flash_recovery_area/ORCL/backupset/
2010_04_14/o1_mf_nnndf_TAG20100414T085114_5wb7ws6f_.bkp
tag=TAG20100414T085114
channel ORA_DISK_1: restored block(s) from backup piece 1
channel ORA_DISK_1: block restore complete, elapsed time: 00:00:01

starting media recovery
media recovery complete, elapsed time: 00:00:01

Finished recover at 14-APR-10
repair failure complete

2. Using NONE Data Recovery Advisor

VERIFY:
- Using DB VERIFY
$ dbv -help

DBVERIFY: Release 11.1.0.6.0 - Production on Wed Apr 14 04:25:48 2010

Copyright (c) 1982, 2007, Oracle. All rights reserved.

Keyword Description (Default)
----------------------------------------------------
FILE File to Verify (NONE)
START Start Block (First Block of File)
END End Block (Last Block of File)
BLOCKSIZE Logical Block Size (8192)
LOGFILE Output Log (NONE)
FEEDBACK Display Progress (0)
PARFILE Parameter File (NONE)
USERID Username/Password (NONE)
SEGMENT_ID Segment ID (tsn.relfile.block) (NONE)
HIGH_SCN Highest Block SCN To Verify (NONE)
(scn_wrap.scn_base OR scn)

$ dbv FILE=/oracle/oradata/ORCL/datafile/o1_mf_users_5twzp1c3_new.dbf
BLOCKSIZE=8192

DBVERIFY: Release 11.1.0.6.0 - Production on Wed Apr 14 04:26:36 2010

Copyright (c) 1982, 2007, Oracle. All rights reserved.

DBVERIFY - Verification starting : FILE = /oracle/oradata/ORCL/datafile/
o1_mf_users_5twzp1c3_new.dbf
Page 10 is marked corrupt
Corrupt block relative dba: 0x0100000a (file 4, block 10)
Completely zero block found during dbv:

DBVERIFY - Verification complete

Total Pages Examined : 35304
Total Pages Processed (Data) : 29789
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 2182
Total Pages Failing (Index): 0
Total Pages Processed (Other): 2254
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 1078
Total Pages Marked Corrupt : 1
Total Pages Influx :0
Total Pages Encrypted :0
Highest block SCN : 909266 (0.909266)

- Using RMAN ***Assume: Using ARCHIVELOG Mode***

RMAN> backup validate tablespace USERS;

Starting backup at 14-APR-10

channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00004 name=/oracle/oradata/ORCL/datafile/
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:07
List of Datafiles
=================
File Status Marked Corrupt Empty Blocks Blocks Examined High SCN
---- ------ -------------- ------------ --------------- ----------
4 FAILED 0 1078 35304 909266
File Name: /oracle/oradata/ORCL/datafile/o1_mf_users_5twzp1c3_new.dbf
Block Type Blocks Failing Blocks Processed
---------- -------------- ----------------
Data 0 29789
Index 0 2182
Other 1 2255

validate found one or more corrupt blocks
See trace file /oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_7505.trc for details
Finished backup at 14-APR-10

SQL> select * from v$database_block_corruption;

FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
4 10 1 0 ALL ZERO

FIX: ***Assume: Using ARCHIVELOG Mode***
RMAN> recover datafile 4 block 10;


backupset/2010_04_14/o1_mf_nnndf_TAG20100414T041711_5w9qtxn2_.bkp
2010_04_14/o1_mf_nnndf_TAG20100414T041711_5w9qtxn2_.bkp
tag=TAG20100414T041711



RMAN> backup validate tablespace USERS;


List of Datafiles
=================
---- ------ -------------- ------------ --------------- ----------
4 OK 0 1078 35304 909266
---------- -------------- ----------------
Data 0 29789
Index 0 2182
Other 0 2255


Or Verify and then Fix

Command:
run{
BACKUP VALIDATE DATABASE;
BLOCKRECOVER CORRUPTION LIST;
}

Example:
$ dd if=/dev/zero of=/oracle/oradata/ORCL/datafile/o1_mf_users_5twzp1c3_new.dbf bs=8k
conv=notrunc seek=10 count=1
1+0 records in
1+0 records out
8192 bytes (8.2 kB) copied, 0.000707258 seconds, 11.6 MB/s

RMAN> run{
BACKUP VALIDATE DATABASE;
BLOCKRECOVER CORRUPTION LIST;
}

o1_mf_sysaux_5twzp15k_.dbf
o1_mf_system_5twzp126_.dbf

o1_mf_undotbs1_5twzp19d_.dbf
o1_mf_flow_1_5w23bgcm_.dbf
o1_mf_tbs_data_5v51k05o_.dbf
List of Datafiles
=================
---- ------ -------------- ------------ --------------- ----------
1 OK 0 13219 103680 1162051
File Name: /oracle/oradata/ORCL/datafile/o1_mf_system_5twzp126_.dbf
---------- -------------- ----------------
Data 0 75573
Index 0 12161
Other 0 2727

---- ------ -------------- ------------ --------------- ----------
2 OK 0 34420 117536 1162049
File Name: /oracle/oradata/ORCL/datafile/o1_mf_sysaux_5twzp15k_.dbf
---------- -------------- ----------------
Data 0 21077
Index 0 14799
Other 0 47240

---- ------ -------------- ------------ --------------- ----------
3 OK 0 112 33280 1162051
File Name: /oracle/oradata/ORCL/datafile/o1_mf_undotbs1_5twzp19d_.dbf
---------- -------------- ----------------
Data 0 0
Index 0 0
Other 0 33168

---- ------ -------------- ------------ --------------- ----------
4 FAILED 0 1078 35304 909266
---------- -------------- ----------------
Data 0 29789
Index 0 2182
Other 1 2255

---- ------ -------------- ------------ --------------- ----------
5 OK 0 5903 12800 1107868
File Name: /oracle/oradata/ORCL/datafile/o1_mf_tbs_data_5v51k05o_.dbf
---------- -------------- ----------------

Data 0 3585
Index 0 3138
Other 0 174

---- ------ -------------- ------------ --------------- ----------
6 OK 0 12265 12808 1112803
File Name: /oracle/oradata/ORCL/datafile/o1_mf_flow_1_5w23bgcm_.dbf
---------- -------------- ----------------
Data 0 159
Index 0 97
Other 0 287

validate found one or more corrupt blocks
See trace file /oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_7572.trc for details
including current control file in backup set
including current SPFILE in backup set
List of Control File and SPFILE
===============================
File Type Status Blocks Failing Blocks Examined
------------ ------ -------------- ---------------
SPFILE OK 0 2
Control File OK 0 600


backupset/2010_04_14/o1_mf_nnndf_TAG20100414T041711_5w9qtxn2_.bkp
2010_04_14/o1_mf_nnndf_TAG20100414T041711_5w9qtxn2_.bkp
tag=TAG20100414T041711



SQL> select * from v$database_block_corruption;

no rows selected

By: Surachart

FIXING BLOCK CORRUPTION (RMAN) on 11G

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