Oracle 11g - How to repair block corruption(on free space) in datafile

Hi,
I have a tablesopace with 3 datafiles, out of which one datafile has corrupted block. But no objects or data is affected as the corrupted block os in free space. This was shown in the alert logs.
Please see below the details:
Wed Apr 06 15:30:04 2011
SMON: Restarting fast_start parallel rollback
SMON: ignoring slave err,downgrading to serial rollback
ORACLE Instance geooap (pid = 12) - Error 1578 encountered while recovering transaction (10, 6) on object 149755.
Errors in file f:\oracle11g\diag\rdbms\geooap\geooap\trace\geooap_smon_5540.trc:
ORA-01578: ORACLE data block corrupted (file # 7, block # 54053)
ORA-01110: data file 7: 'F:\ORACLE11G\ORADATA\GEOOAP\ORDER_DATA_01.DBF'
GEOAP:
Fri Apr 01 14:57:48 2011
Errors in file f:\oracle11g\diag\rdbms\geop\geop\trace\geop_arc1_2156.trc:
ORA-00235: control file read without a lock inconsistent due to concurrent update
Fri Apr 01 14:57:58 2011
================================================================
The corruption is being reported in a free space block of the ORDER_DATA_01.DBF.
I’ve checked all the tables (and indexes) in this tablespace and none report corruption.
=====================================================Is there any action I need to take to remove corruption at this point?It is not affected any operation on the database yet.
What is the best way to do get rid of the corrupt block, without dropping and rebuillding the full tablespace(which is around 6 GB -total of 3 datafiles)
Thanks a lot

Can RMAN recover the datablock from this cold backup(which is a week old, the data file was not corrupted then) ?Please note that to do the recovery, you would need the backup and the archivelog files since the backup. Think about what you are asking to do. Its a single block whose recovery you are asking from a week old backup which obviously would be on an much older SCN compared to the rest of the database. How would you make that block consistent with the rest of the datafile. If you don't have archivelog in that db whose block is corrupted, you may forget that block and any data that it might ever had. Also, please read the documentation about the block recovery which explains the requirements very clearly,
http://download.oracle.com/docs/cd/E11882_01/backup.112/e10642/rcmblock.htm#BRADV89784
From the above link, 1st point,
The target database must run in ARCHIVELOG mode and be open or mounted with a current control file.HTH
Aman....

Similar Messages

Block corruption in Free Space

Hi,
Environment:-
Oralce 10.2.0
Windows platform
I am facing problem of Logical block corruption.
RMAN validate block corruption (DBVerify as well) But no entry in Alert log file.
When I check Which segment has block corruption I found that block corruption are in free blocks of tablespace (DBA_FREE_SPACE).
To Fix it I create table and allocate corrupted block to that table. I confirm corrupted block allocation in table (using DBA_EXTENTS).
But when I insert rows in that table to reuse corrupted block Oracle give error of ora-1578 Block corruption, and I am not able to reuse corrupted block(as many expert suggest to overcome block corruption in free space).
I dropped table and recreate and repeat this process many times but still no success.
So. can anybody help me on this.
I appreciate your efforts and time you spend to read this
Thanks

Hello,
Please check the link i posted.
Example: Detecting Corruption
The CHECK_OBJECT procedure checks the specified object, and populates the repair table with information about corruptions and repair directives. You can optionally specify a range, partition name, or subpartition name when you want to check a portion of an object.
Validation consists of checking all blocks in the object that have not previously been marked corrupt. For each block, the transaction and data layer portions are checked for self consistency. During CHECK_OBJECT, if a block is encountered that has a corrupt buffer cache header, then that block is skipped.
The following is an example of executing the CHECK_OBJECT procedure for the scott.dept table.
SET SERVEROUTPUT ON
DECLARE num_corrupt INT;
BEGIN
num_corrupt := 0;
DBMS_REPAIR.CHECK_OBJECT (
SCHEMA_NAME => 'SCOTT',
OBJECT_NAME => 'DEPT',
REPAIR_TABLE_NAME => 'REPAIR_TABLE',
CORRUPT_COUNT => num_corrupt);
DBMS_OUTPUT.PUT_LINE('number corrupt: ' || TO_CHAR (num_corrupt));
END;
SQL*Plus outputs the following line, indicating one corruption:
number corrupt: 1

Block Corruption In Free Space Chuck Of A Datafile

Hi all,
I have run into this issue where both dbv and rman have caught a block corruption on one of the datafiles. When I checked these blocks, they did not belong to any segments and I was able to verify that this block ID falls in the block_id + blocks range in the dba_free_space where file_id = 41.
My questions are ...
- why is rman complaining about a bad block in free space? It will never need to back it up any way?
- According to note 28814.1, this type of corruption can be ignored and if when oracle needs to use this block, it will simply create/rewrite a new image without the corrupted data. Have you been affected by this issue? If yes, what did you do?
Thank you

1. "why is rman complaining about a bad block in free space? It will never need to back it up any way?"
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In what version? I generally find it helpful to read the docs and check discussions of issues on metalink.

How RMAN detect block corruption

Hi,
how RMAN detect block corruption( means how RMAN work internally to find corrupted block).
thanks.

There are initialization parameters (like DB_BLOCK_CHECKING) which will detect block corruption on block access. Go through the following link also:
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmconc1.htm

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Hi,
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user11225122 wrote:
Hi,
I currently using oracle 11g How can I change database from NoArchivelog node to Archivelog node using spfile.
And where exactly the spfile will be located?
My instance is EPM11 in my local oracle is present in D folder where can i found the pfile?
In this path i found 1 pfile in my Local Machine
"D:/Oracle/Product/11g/admin/epm11/pfile" .I have added the following commands in this pfile
# Archive Log Destinations -benr(10/15/04)
log_archive_dest_1='location=/u02/oradata/cuddle/archive'
log_archive_start=TRUE
Then i have ran the shutdown command.
Database instance is showtdown.
After that i am not able to perform startup.
So please suggest me how to change the mode using SPfile and tell me the path where spfile and pfile should be located?
And also do i need to set the "Oracle_Home" path in my environment variables"
Thanks In Advance,
Chandanaremove log_archive_start=TRUE from pfile (it is depricated from 10g onwards)
SQL>startup nomount pfile="D:/Oracle/Product/11g/admin/epm11/pfile/initYOUR_SID_NAME.ora"
SQL>Create spfile from pfile="D:/Oracle/Product/11g/admin/epm11/pfile/initYOUR_SID_NAME.ora"
SQL>SHUT IMMEDIATE;
SQL>STARTUP MOUNT
SQL>ALTER DATABASE ARCHIVELOG;
SQL>ALTER DATABASE OPEN;
SQL>ARCHIVE LOG LIST;
SQL>SHOW PARAMATER SPFILE;
YOU WILL FIND THE LOCATION OF SPFILE
SQL>

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thank you so much that link was helpful (specially it's last respond)
I could create data block corruption and I tested DBMS_REPAIR and RMAN for data block recovery
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Thanks & Regards
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        68     155671         18         1174783145 LOGICAL
        68     155691         18         1174783146 LOGICAL
        68     155711         18         1174783147 LOGICAL
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        68     155851         78         1174783154 LOGICAL
        68     155931         49         1174783158 LOGICAL
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using channel ORA_DISK_2
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RMAN-00571: ===========================================================
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How to calculate the percentage of free space for a table in Oracle

okay, I am a little confused here. I have been searching the web and looking at a lot of documents. What I basically want to find out is this, how do I calculate the difference between the number of bytes a table is using and the total bytes allocated to a table space (going that way to get percent free for a particular table). So I need a byte count of a table and total table space and the percentage difference. I have been looking at the DBA_TABLES DBA_TABLESPACES and DBA_SEGMENTS views. I have tried to calculated the space as num_rows * avg_row_len (if I am wrong, let me know). I have been trying to compare that calculation to the number in DBA_TABLESPACES and DBA_SEGMENTS. I am just looking for the total space allocated to the table space that the table sits in (seem logical right now) to make the percentage value work. Thus I want to be able to track the table as it grows as compated to the table space it sits in to see a value as it changes over time (days, weeks, etc.) each time I run this script I am working on.
Can someone get me straight and help me to find out if I am looking in the right places. Any advice would help.
Edward

You can use a little modified version of dbms_space from Tom, show_space. Have a look,
SQL> create table test222 as select * from all_objects;
Table created.
SQL> delete from test22 where rownum<=100;
delete from test22 where rownum<=100
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> delete from test222 where rownum<=100;
100 rows deleted.
SQL> analyze table test222 compute statistics;
Table analyzed.
SQL> create or replace procedure show_space
2 ( p_segname in varchar2,
3    p_owner   in varchar2 default user,
4    p_type    in varchar2 default 'TABLE',
5    p_partition in varchar2 default NULL )
6 -- this procedure uses authid current user so it can query DBA_*
7 -- views using privileges from a ROLE and so it can be installed
8 -- once per database, instead of once per user that wanted to use it
9 authid current_user
10 as
11      l_free_blks                 number;
12      l_total_blocks              number;
13      l_total_bytes               number;
14      l_unused_blocks             number;
15      l_unused_bytes              number;
16      l_LastUsedExtFileId         number;
17      l_LastUsedExtBlockId        number;
18      l_LAST_USED_BLOCK           number;
19      l_segment_space_mgmt        varchar2(255);
20      l_unformatted_blocks number;
21      l_unformatted_bytes number;
22      l_fs1_blocks number; l_fs1_bytes number;
23      l_fs2_blocks number; l_fs2_bytes number;
24      l_fs3_blocks number; l_fs3_bytes number;
25      l_fs4_blocks number; l_fs4_bytes number;
26      l_full_blocks number; l_full_bytes number;
27
28      -- inline procedure to print out numbers nicely formatted
29      -- with a simple label
30      procedure p( p_label in varchar2, p_num in number )
31      is
32      begin
33          dbms_output.put_line( rpad(p_label,40,'.') ||
34                                to_char(p_num,'999,999,999,999') );
35      end;
36 begin
37     -- this query is executed dynamically in order to allow this procedure
38     -- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES
39     -- via a role as is customary.
40     -- NOTE: at runtime, the invoker MUST have access to these two
41     -- views!
42     -- this query determines if the object is a ASSM object or not
43     begin
44        execute immediate
45            'select ts.segment_space_management
46               from dba_segments seg, dba_tablespaces ts
47              where seg.segment_name      = :p_segname
48                and (:p_partition is null or
49                    seg.partition_name = :p_partition)
50                and seg.owner = :p_owner
51                and seg.tablespace_name = ts.tablespace_name'
52               into l_segment_space_mgmt
53              using p_segname, p_partition, p_partition, p_owner;
54     exception
55         when too_many_rows then
56            dbms_output.put_line
57            ( 'This must be a partitioned table, use p_partition => ');
58            return;
59     end;
60
61
62     -- if the object is in an ASSM tablespace, we must use this API
63     -- call to get space information, else we use the FREE_BLOCKS
64     -- API for the user managed segments
65     if l_segment_space_mgmt = 'AUTO'
66     then
67       dbms_space.space_usage
68       ( p_owner, p_segname, p_type, l_unformatted_blocks,
69         l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes,
70         l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes,
71         l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition);
72
73       p( 'Unformatted Blocks ', l_unformatted_blocks );
74       p( 'FS1 Blocks (0-25) ', l_fs1_blocks );
75       p( 'FS2 Blocks (25-50) ', l_fs2_blocks );
76       p( 'FS3 Blocks (50-75) ', l_fs3_blocks );
77       p( 'FS4 Blocks (75-100)', l_fs4_blocks );
78       p( 'Full Blocks        ', l_full_blocks );
79    else
80       dbms_space.free_blocks(
81         segment_owner     => p_owner,
82         segment_name      => p_segname,
83         segment_type      => p_type,
84         freelist_group_id => 0,
85         free_blks         => l_free_blks);
86
87       p( 'Free Blocks', l_free_blks );
88    end if;
89
90    -- and then the unused space API call to get the rest of the
91    -- information
92    dbms_space.unused_space
93    ( segment_owner     => p_owner,
94      segment_name      => p_segname,
95      segment_type      => p_type,
96      partition_name    => p_partition,
97      total_blocks      => l_total_blocks,
98      total_bytes       => l_total_bytes,
99      unused_blocks     => l_unused_blocks,
100      unused_bytes      => l_unused_bytes,
101      LAST_USED_EXTENT_FILE_ID => l_LastUsedExtFileId,
102      LAST_USED_EXTENT_BLOCK_ID => l_LastUsedExtBlockId,
103      LAST_USED_BLOCK => l_LAST_USED_BLOCK );
104
105      p( 'Total Blocks', l_total_blocks );
106      p( 'Total Bytes', l_total_bytes );
107      p( 'Total MBytes', trunc(l_total_bytes/1024/1024) );
108      p( 'Unused Blocks', l_unused_blocks );
109      p( 'Unused Bytes', l_unused_bytes );
110      p( 'Last Used Ext FileId', l_LastUsedExtFileId );
111      p( 'Last Used Ext BlockId', l_LastUsedExtBlockId );
112      p( 'Last Used Block', l_LAST_USED_BLOCK );
113 end;
114
115 /
Procedure created.
SQL> desc show_space
PROCEDURE show_space
Argument Name                  Type                    In/Out Default?
P_SEGNAME                      VARCHAR2                IN
P_OWNER                        VARCHAR2                IN     DEFAULT
P_TYPE                         VARCHAR2                IN     DEFAULT
P_PARTITION                    VARCHAR2                IN     DEFAULT
SQL> set serveroutput on
SQL> exec show_space('TEST222','SCOTT');
BEGIN show_space('TEST222','SCOTT'); END;
ERROR at line 1:
ORA-00942: table or view does not exist
ORA-06512: at "SCOTT.SHOW_SPACE", line 44
ORA-06512: at line 1
SQL> conn / as sysdba
Connected.
SQL> grant sysdba to scott;
Grant succeeded.
SQL> conn scott/tiger as sysdba
Connected.
SQL> exec show_space('TEST222','SCOTT');
BEGIN show_space('TEST222','SCOTT'); END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00201: identifier 'SHOW_SPACE' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
SQL> exec scott.show_space('TEST222','SCOTT');
PL/SQL procedure successfully completed.
SQL> set serveroutput on
SQL> exec scott.show_space('TEST222','SCOTT');
Unformatted Blocks .....................               0
FS1 Blocks (0-25) .....................               0
FS2 Blocks (25-50) .....................               1
FS3 Blocks (50-75) .....................               0
FS4 Blocks (75-100).....................               1
Full Blocks        .....................             807
Total Blocks............................             896
Total Bytes.............................       7,340,032
Total MBytes............................               7
Unused Blocks...........................              65
Unused Bytes............................         532,480
Last Used Ext FileId....................               4
Last Used Ext BlockId...................           1,289
Last Used Block.........................              63
PL/SQL procedure successfully completed.
SQL>http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5350053031470
I use this to find the space allocations.
Just read your post again,this is not going to show you the percentage of the free/used space. This is going to be the number of blocks which are free/used. For the growth trend, you can look at (in 10g) Oracle EM. It has added now,Segment Growth Trend report which can show you for each object,comparing to the allocated space to the object,how much space is being used by it.
HTH
Aman....

Oracle 11g - How to repair block corruption(on free space) in datafile

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