Corrupt block methods

Hi
1-)
If the database in noarchivelog mode I cannot issue:
Rman>
BACKUP VALIDATE DATABASE;
Since this command just checks if there is any corrupted blocks, and doesnt take backup, why it wants archivelog mode ?
2-) If I want to search corrupted blocks is there any diffrence among using
RMAN> BACKUP VALIDATE DATABASE;
or
dverify
or
analyze ... validate structure ;
P.S:noarchivelog mode.

I read the link
The thing is I dont want to specify one by one all datafiles.
I want to scan all datafiles automatically? What if I have more than 700 datafiles?
Is that possible with dbv?

Similar Messages

How to make a corrupted block?

Hi all,
Is there any method to make a block corrupted in Oracle (for Windows)?
My target is to test detecting and repairing corrupted blocks tools in Oracle.
Thanks in advance,
Ahmed B.

Its not a great practice to do and oracle doesn't recommend such act. However, Oracle Support they have some internal utility for such, I dont know whether it is available to public or not. Search at metalink.
Jaffar
I just reaclled, there is a utility called 'bbed' which comes with oracle.
However in UNIX you can use the dd command to corrupt a few blocks.Something like
dd ibs=db_block_Size skip=n count=n if=/dev/null of=full_path_name_of_file_to_corrupt
You can use the freeware hexedit to simulate block corruption in Windows.
My sincere request is that dont do this with your production db. Use it very caciously.
Message was edited by:
The Human Fly

Data corrupt block

os Sun 5.10 oracle version 10.2.0.2 RAC 2 node
alert.log 내용
Hex dump of (file 206, block 393208) in trace file /oracle/app/oracle/admin/DBPGIC/udump/dbpgic1_ora_1424.trc
Corrupt block relative dba: 0x3385fff8 (file 206, block 393208)
Bad header found during backing up datafile
Data in bad block:
type: 32 format: 0 rdba: 0x00000001
last change scn: 0x0000.98b00394 seq: 0x0 flg: 0x00
spare1: 0x1 spare2: 0x27 spare3: 0x2
consistency value in tail: 0x00000001
check value in block header: 0x0
block checksum disabled
Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
corrupt 발생한 Block id 를 검색해 보면 Block id 가 검색이 안됩니다.
dba_extents 로 검색
corrupt 때문에 Block id 가 검색이 안되는 것인지 궁금합니다.
export 받으면 데이타는 정상적으로 export 가능.

다행이네요. block corruption 이 발생한 곳이 데이터가 저장된 블록이
아닌 것 같습니다. 그것도 rman백업을 통해서 발견한 것 같는데
맞는지요?
scn이 scn: 0x0000.00000000 가 아닌
0x0000.98b00394 인 것으로 봐서는 physical corrupt 가 아닌
soft corrupt인 것 같습니다.
그렇다면 버그일 가능성이 높아서 찾아보니
Bug 4411228 - Block corruption with mixture of file system and RAW files
의 버그가 발견되었습니다. 이것이 아닐 수도 있지만..
이러한 block corruption에 대한 처리방법 및 원인분석은
오라클(주)를 통해서 정식으로 요청하셔야 합니다.
metalink를 통해서 SR 요청을 하십시오.
export는 high water mark 이후의 block corruption을 찾아내지 못하고 이외에도
아래 몇가지 경우에서도 찾아내지 못합니다.
db verify( dbv)의 경우에는 physical corruption은 찾아내지 못하고
soft block corruption만 찾아낼 수 있습니다.
경험상 physical corruption 이 발생하였으나 /dev/null로
datafile copy가 안되는데도 dbv로는 이 문제를 찾아내지
못하였습니다.
그렇다면 가장 좋은 방법은 rman 입니다. rman은 high water mark까지의
데이터를 백업해주면서 전체 데이터파일에 대한 체크를 하기도 합니다.
physical corruption뿐만 아니라 logical corruption도 체크를
하니 점검하기로는 rman이 가장 좋은 방법이라 생각합니다.
The Export Utility
# Use a full export to check database consistency
# Export performs a full scan for all tables
# Export only reads:
- User data below the high-water mark
- Parts of the data dictionary, while looking up information concerning the objects being exported
# Export does not detect the following:
- Disk corruptions above the high-water mark
- Index corruptions
- Free or temporary extent corruptions
- Column data corruption (like invalid date values)
block corruption을 정상적으로 복구하는 방법은 restore 후에
복구하는 방법이 있겠으나 이미 restore할 백업이 block corruption이
발생했을 수도 있습니다. 그러므로 다른 서버에 restore해보고
정상적인 datafile인 것을 확인 후에 실환경에 restore하는 것이 좋습니다.
만약 백업본까지 block corruption이 발생하였거나 또는 시간적 여유가
없을 경우에는 table을 move tablespace 또는 index rebuild를 통해서
다른 테이블스페이스로 데이터를 옮겨두고 문제가 발생한 테이블스페이스를
drop해버리고 재생성 하는 것이 좋을 것 같습니다.(지금 현재 데이터의
손실은 없으니 move tablespace, rebuild index 방법이 좋겠습니다.
Handling Corruptions
Check the alert file and system log file
Use diagnostic tools to determine the type of corruption
Dump blocks to find out what is wrong
Determine whether the error persists by running checks multiple times
Recover data from the corrupted object if necessary
Preferred resolution method: media recovery
Handling Corruptions
Always try to find out if the error is permanent. Run the analyze command multiple times or, if possible, perform a shutdown and a startup and try again to perform the operation that failed earlier.
Find out whether there are more corruptions. If you encounter one, there may be other corrupted blocks, as well. Use tools like DBVERIFY for this.
Before you try to salvage the data, perform a block dump as evidence to identify the actual cause of the corruption.
Make a hex dump of the bad block, using UNIX dd and od -x.
Consider performing a redo log dump to check all the changes that were made to the block so that you can discover when the corruption occurred.
Note: Remember that when you have a block corruption, performing media recovery is the recommended process after the hardware is verified.
Resolve any hardware issues:
- Memory boards
- Disk controllers
- Disks
Recover or restore data from the corrupt object if necessary
Handling Corruptions (continued)
There is no point in continuing to work if there are hardware failures. When you encounter hardware problems, the vendor should be contacted and the machine should be checked and fixed before continuing. A full hardware diagnostics should be run.
Many types of hardware failures are possible:
Bad I/O hardware or firmware
Operating system I/O or caching problem
Memory or paging problems
Disk repair utilities
아래 관련 자료를 드립니다.
All About Data Blocks Corruption in Oracle
Vijaya R. Dumpa
Data Block Overview:
Oracle allocates logical database space for all data in a database. The units of database space allocation are data blocks (also called logical blocks, Oracle blocks, or pages), extents, and segments. The next level of logical database space is an extent. An extent is a specific number of contiguous data blocks allocated for storing a specific type of information. The level of logical database storage above an extent is called a segment. The high water mark is the boundary between used and unused space in a segment.
The header contains general block information, such as the block address and the type of segment (for example, data, index, or rollback).
Table Directory, this portion of the data block contains information about the table having rows in this block.
Row Directory, this portion of the data block contains information about the actual rows in the block (including addresses for each row piece in the row data area).
Free space is allocated for insertion of new rows and for updates to rows that require additional space.
Row data, this portion of the data block contains rows in this block.
Analyze the Table structure to identify block corruption:
By analyzing the table structure and its associated objects, you can perform a detailed check of data blocks to identify block corruption:
SQL> analyze table_name/index_name/cluster_name ... validate structure cascade;
Detecting data block corruption using the DBVERIFY Utility:
DBVERIFY is an external command-line utility that performs a physical data structure integrity check on an offline database. It can be used against backup files and online files. Integrity checks are significantly faster if you run against an offline database.
Restrictions:
DBVERIFY checks are limited to cache-managed blocks. It’s only for use with datafiles, it will not work against control files or redo logs.
The following example is sample output of verification for the data file system_ts_01.dbf. And its Start block is 9 and end block is 25. Blocksize parameter is required only if the file to be verified has a non-2kb block size. Logfile parameter specifies the file to which logging information should be written. The feedback parameter has been given the value 2 to display one dot on the screen for every 2 blocks processed.
$ dbv file=system_ts_01.dbf start=9 end=25 blocksize=16384 logfile=dbvsys_ts.log feedback=2
DBVERIFY: Release 8.1.7.3.0 - Production on Fri Sep 13 14:11:52 2002
(c) Copyright 2000 Oracle Corporation. All rights reserved.
Output:
$ pg dbvsys_ts.log
DBVERIFY: Release 8.1.7.3.0 - Production on Fri Sep 13 14:11:52 2002
(c) Copyright 2000 Oracle Corporation. All rights reserved.
DBVERIFY - Verification starting : FILE = system_ts_01.dbf
DBVERIFY - Verification complete
Total Pages Examined : 17
Total Pages Processed (Data) : 10
Total Pages Failing (Data) : 0
Total Pages Processed (Index) : 2
Total Pages Failing (Index) : 0
Total Pages Processed (Other) : 5
Total Pages Empty : 0
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
Detecting and reporting data block corruption using the DBMS_REPAIR package:
Note: Note that this event can only be used if the block "wrapper" is marked corrupt.
Eg: If the block reports ORA-1578.
1. Create DBMS_REPAIR administration tables:
To Create Repair tables, run the below package.
SQL> EXEC DBMS_REPAIR.ADMIN_TABLES(‘REPAIR_ADMIN’, 1,1, ‘REPAIR_TS’);
Note that table names prefix with ‘REPAIR_’ or ‘ORPAN_’. If the second variable is 1, it will create ‘REAIR_key tables, if it is 2, then it will create ‘ORPAN_key tables.
If the thread variable is
1 then package performs ‘create’ operations.
2 then package performs ‘delete’ operations.
3 then package performs ‘drop’ operations.
2. Scanning a specific table or Index using the DBMS_REPAIR.CHECK_OBJECT procedure:
In the following example we check the table employee for possible corruption’s that belongs to the schema TEST. Let’s assume that we have created our administration tables called REPAIR_ADMIN in schema SYS.
To check the table block corruption use the following procedure:
SQL> VARIABLE A NUMBER;
SQL> EXEC DBMS_REPAIR.CHECK_OBJECT (‘TEST’,’EMP’, NULL,
1,’REPAIR_ADMIN’, NULL, NULL, NULL, NULL,:A);
SQL> PRINT A;
To check which block is corrupted, check in the REPAIR_ADMIN table.
SQL> SELECT * FROM REPAIR_ADMIN;
3. Fixing corrupt block using the DBMS_REPAIR.FIX_CORRUPT_BLOCK procedure:
SQL> VARIABLE A NUMBER;
SQL> EXEC DBMS_REPAIR.FIX.CORRUPT_BLOCKS (‘TEST’,’EMP’, NULL,
1,’REPARI_ADMIN’, NULL,:A);
SQL> SELECT MARKED FROM REPAIR_ADMIN;
If u select the EMP table now you still get the error ORA-1578.
4. Skipping corrupt blocks using the DBMS_REPAIR. SKIP_CORRUPT_BLOCK procedure:
SQL> EXEC DBMS_REPAIR. SKIP_CORRUPT.BLOCKS (‘TEST’, ‘EMP’, 1,1);
Notice the verification of running the DBMS_REPAIR tool. You have lost some of data. One main advantage of this tool is that you can retrieve the data past the corrupted block. However we have lost some data in the table.
5. This procedure is useful in identifying orphan keys in indexes that are pointing to corrupt rows of the table:
SQL> EXEC DBMS_REPAIR. DUMP ORPHAN_KEYS (‘TEST’,’IDX_EMP’, NULL,
2, ‘REPAIR_ADMIN’, ‘ORPHAN_ADMIN’, NULL,:A);
If u see any records in ORPHAN_ADMIN table you have to drop and re-create the index to avoid any inconsistencies in your queries.
6. The last thing you need to do while using the DBMS_REPAIR package is to run the DBMS_REPAIR.REBUILD_FREELISTS procedure to reinitialize the free list details in the data dictionary views.
SQL> EXEC DBMS_REPAIR.REBUILD_FREELISTS (‘TEST’,’EMP’, NULL, 1);
NOTE
Setting events 10210, 10211, 10212, and 10225 can be done by adding the following line for each event in the init.ora file:
Event = "event_number trace name errorstack forever, level 10"
When event 10210 is set, the data blocks are checked for corruption by checking their integrity. Data blocks that don't match the format are marked as soft corrupt.
When event 10211 is set, the index blocks are checked for corruption by checking their integrity. Index blocks that don't match the format are marked as soft corrupt.
When event 10212 is set, the cluster blocks are checked for corruption by checking their integrity. Cluster blocks that don't match the format are marked as soft corrupt.
When event 10225 is set, the fet$ and uset$ dictionary tables are checked for corruption by checking their integrity. Blocks that don't match the format are marked as soft corrupt.
Set event 10231 in the init.ora file to cause Oracle to skip software- and media-corrupted blocks when performing full table scans:
Event="10231 trace name context forever, level 10"
Set event 10233 in the init.ora file to cause Oracle to skip software- and media-corrupted blocks when performing index range scans:
Event="10233 trace name context forever, level 10"
To dump the Oracle block you can use below command from 8.x on words:
SQL> ALTER SYSTEM DUMP DATAFILE 11 block 9;
This command dumps datablock 9 in datafile11, into USER_DUMP_DEST directory.
Dumping Redo Logs file blocks:
SQL> ALTER SYSTEM DUMP LOGFILE ‘/usr/oracle8/product/admin/udump/rl. log’;
Rollback segments block corruption, it will cause problems (ORA-1578) while starting up the database.
With support of oracle, can use below under source parameter to startup the database.
CORRUPTEDROLLBACK_SEGMENTS=(RBS_1, RBS_2)
DB_BLOCK_COMPUTE_CHECKSUM
This parameter is normally used to debug corruption’s that happen on disk.
The following V$ views contain information about blocks marked logically corrupt:
V$ BACKUP_CORRUPTION, V$COPY_CORRUPTION
When this parameter is set, while reading a block from disk to catch, oracle will compute the checksum again and compares it with the value that is in the block.
If they differ, it indicates that the block is corrupted on disk. Oracle makes the block as corrupt and signals an error. There is an overhead involved in setting this parameter.
DB_BLOCK_CACHE_PROTECT=‘TRUE’
Oracle will catch stray writes made by processes in the buffer catch.
Oracle 9i new RMAN futures:
Obtain the datafile numbers and block numbers for the corrupted blocks. Typically, you obtain this output from the standard output, the alert.log, trace files, or a media management interface. For example, you may see the following in a trace file:
ORA-01578: ORACLE data block corrupted (file # 9, block # 13)
ORA-01110: data file 9: '/oracle/dbs/tbs_91.f'
ORA-01578: ORACLE data block corrupted (file # 2, block # 19)
ORA-01110: data file 2: '/oracle/dbs/tbs_21.f'
$rman target =rman/rman@rmanprod
RMAN> run {
2> allocate channel ch1 type disk;
3> blockrecover datafile 9 block 13 datafile 2 block 19;
4> }
Recovering Data blocks Using Selected Backups:
# restore from backupset
BLOCKRECOVER DATAFILE 9 BLOCK 13 DATAFILE 2 BLOCK 19 FROM BACKUPSET;
# restore from datafile image copy
BLOCKRECOVER DATAFILE 9 BLOCK 13 DATAFILE 2 BLOCK 19 FROM DATAFILECOPY;
# restore from backupset with tag "mondayAM"
BLOCKRECOVER DATAFILE 9 BLOCK 13 DATAFILE 2 BLOCK 199 FROM TAG = mondayAM;
# restore using backups made before one week ago
BLOCKRECOVER DATAFILE 9 BLOCK 13 DATAFILE 2 BLOCK 19 RESTORE
UNTIL 'SYSDATE-7';
# restore using backups made before SCN 100
BLOCKRECOVER DATAFILE 9 BLOCK 13 DATAFILE 2 BLOCK 19 RESTORE UNTIL SCN 100;
# restore using backups made before log sequence 7024
BLOCKRECOVER DATAFILE 9 BLOCK 13 DATAFILE 2 BLOCK 19 RESTORE
UNTIL SEQUENCE 7024;
글 수정:
Min Angel (Yeon Hong Min, Korean)

ORACLE 8.0.5 on SuSE 5.3 and 6.0 - Corrupt Block

I do some heavy loading (Designer 2000) and I do get similar
errors on 2 different computer with mirrored disks -different
systems - on each one. So I'd like to exclude hardware problems.
it's experimental - so I do not run archives -
Designer on W95 crashes quite often but this should never lead
to corrupted data blocks.
Linux was hanging too - and disk-cache might not have been
written to disk ????? could this be a reason ???
Corrupt block relative dba: 0x01003aa8 file=4. blocknum=15016.
Fractured block found during buffer read
Data in bad block - type:6. format:2. rdba:0x01003aa8
last change scn:0x0000.00014914 seq:0x3 flg:0x00
consistancy value in tail 0x496b0605
check value in block header: 0x0, check value not calculated
spare1:0x0, spare2:0x0, spare2:0x0
would be happy to get some feedback
null

Ferdinand Gassauer (guest) wrote:
: I do some heavy loading (Designer 2000) and I do get similar
: errors on 2 different computer with mirrored disks -different
: systems - on each one. So I'd like to exclude hardware
problems.
: it's experimental - so I do not run archives -
: Designer on W95 crashes quite often but this should never lead
: to corrupted data blocks.
: Linux was hanging too - and disk-cache might not have been
: written to disk ????? could this be a reason ???
: Corrupt block relative dba: 0x01003aa8 file=4. blocknum=15016.
: Fractured block found during buffer read
: Data in bad block - type:6. format:2. rdba:0x01003aa8
: last change scn:0x0000.00014914 seq:0x3 flg:0x00
: consistancy value in tail 0x496b0605
: check value in block header: 0x0, check value not calculated
: spare1:0x0, spare2:0x0, spare2:0x0
: would be happy to get some feedback
Please check first /var/log/messages for any linux errors. It is
likely that if linux crashes and cannot sync to disk that there
might be some corruption problems. For this reason lts of people
would like to see raw device support but apparently Linus is not
willing for some reason...
I assume some hardware relevant problems though
Marcus
null

Trouble writing a blocking method when asking GUI for input

Hi,
I think this is more of a thread question than a GUI question, so that is why i posted it here...
My problem is I have a client/server application, and the client also has a GUI, which I get an input string from.
My problem is, that I don't know how to write a blocking method, which will wait for the GUI's input.
The example I provided below is very simple, and the obvious solution would be to use a JOptionPane, but that is not a viable solution. The way I am getting around this now is using a Thread.sleep call in my GUI, but I feel that this is incorrect, and there should be another way around it.
Here is my server class (w/ main method)
import java.net.*;
import java.io.*;
public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(4444);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 4444.");
            System.exit(1);
        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        String outputLine;
        outputLine = "Temp String";
        out.println(outputLine);
         System.err.println("Client: " + in.readLine());
        outputLine = "Bye";
        out.println(outputLine);
        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
}Here is my client class (w/ main method)
import java.io.*;
import java.net.*;
public class Client {
    public static void main(String[] args) throws IOException {
        Socket kkSocket = null;
        PrintWriter out = null;
        BufferedReader in = null;
        try {
            kkSocket = new Socket("localhost", 4444);
            out = new PrintWriter(kkSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: localhost.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to: localhost.");
            System.exit(1);
        ClientGUI cg = new ClientGUI();
        String fromServer;
        String fromUser;
        while ((fromServer = in.readLine()) != null) {
            System.out.println("Server: " + fromServer);
            if (fromServer.equals("Bye."))
                break;
            fromUser = cg.getInput();
         if (fromUser != null) {
                System.out.println("Client: " + fromUser);
                out.println(fromUser);
        out.close();
        in.close();
        kkSocket.close();
         System.exit(0);
}and here is the ClientGUI class (note: you need to resize it in order to see the textbox....
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class ClientGUI extends JFrame {
     private JTextField textBox = new JTextField();
     private JButton input = new JButton("Submit");
     private boolean recievedInput = false;
     private String inputText = "";
     public ClientGUI() {
          this.setupGUI();
     private ActionListener buttonAction = new ActionListener() {
          public void actionPerformed(ActionEvent e) {
               inputText = textBox.getText();
               recievedInput = true;
     public String getInput() {
          while(recievedInput == false) {
               try {
                    Thread.sleep(2000); //I DONT want to do this!!
               catch(InterruptedException e) {
                    e.printStackTrace();
          recievedInput = false;
          return inputText;
     private void setupGUI() {
          textBox.setMinimumSize(new Dimension(100, 20));
          input.addActionListener(buttonAction);
          this.getContentPane().setLayout(new BorderLayout());
          this.getContentPane().add(textBox, BorderLayout.WEST);
          this.getContentPane().add(input, BorderLayout.EAST);
          this.pack();
          this.setSize(100,300);
          this.setVisible(true);
}If you have any ideas, I would greatly appreciate it

warnerja,
I tried the following, but I got an exception.
in the while loop inside Client.java, I put the following:
             synchronized(cg) {
                  try {
                      cg.wait();
                    fromUser = cg.getInput();
                  catch(InterruptedException e) {
                       e.printStackTrace();
             }and inside my ClientGUI class, I put the following:
private ActionListener buttonAction = new ActionListener() {
          public void actionPerformed(ActionEvent e) {
               inputText = textBox.getText();
               ClientGUI.this.notify();
     public String getInput() {
          return inputText;
     }But I got this exception:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalMonitorStateException: current thread not owner
     at java.lang.Object.notify(Native Method)
     at ClientGUI$1.actionPerformed(ClientGUI.java:21)
any idea what I am doing wrong?

Recovery is repairing media corrupt block x of file x in standby alert log

Hi,
oracle version:8.1.7.0.0
os version :solaris 5.9
we have oracle 8i primary and standby database. i am getting erorr in alert log file:
Thu Aug 28 22:48:12 2008
Media Recovery Log /oratranslog/arch_1_1827391.arc
Thu Aug 28 22:50:42 2008
Media Recovery Log /oratranslog/arch_1_1827392.arc
bash-2.05$ tail -f alert_pindb.log
Recovery is repairing media corrupt block 991886 of file 179
Recovery is repairing media corrupt block 70257 of file 184
Recovery is repairing media corrupt block 70258 of file 184
Recovery is repairing media corrupt block 70259 of file 184
Recovery is repairing media corrupt block 70260 of file 184
Recovery is repairing media corrupt block 70261 of file 184
Thu Aug 28 22:48:12 2008
Media Recovery Log /oratranslog/arch_1_1827391.arc
Thu Aug 28 22:50:42 2008
Media Recovery Log /oratranslog/arch_1_1827392.arc
Recovery is repairing media corrupt block 500027 of file 181
Recovery is repairing media corrupt block 500028 of file 181
Recovery is repairing media corrupt block 500029 of file 181
Recovery is repairing media corrupt block 500030 of file 181
Recovery is repairing media corrupt block 500031 of file 181
Recovery is repairing media corrupt block 991837 of file 179
Recovery is repairing media corrupt block 991838 of file 179
how i can resolve this.
[pre]
Thanks
Prakash
Edited by: user612485 on Aug 28, 2008 10:53 AM

Dear satish kandi,
recently we have created index for one table with nologgign option, i think for that reason i am getting that error.
if i run dbv utility on the files which are shown in alert log file i am getting the following results.
bash-2.05$ dbv file=/oracle15/oradata/pindb/pinx055.dbf blocksize=4096
DBVERIFY: Release 8.1.7.0.0 - Production on Fri Aug 29 12:18:27 2008
(c) Copyright 2000 Oracle Corporation. All rights reserved.
DBVERIFY - Verification starting : FILE = /oracle15/oradata/pindb/pinx053.dbf
Block Checking: DBA = 751593895, Block Type =
Found block already marked corrupted
Block Checking: DBA = 751593896, Block Type =
.DBVERIFY - Verification complete
Total Pages Examined : 1048576
Total Pages Processed (Data) : 0
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 1036952
Total Pages Failing (Index): 0
Total Pages Processed (Other): 7342
Total Pages Empty : 4282
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
bash-2.05$ dbv file=/oracle15/oradata/pindb/pinx053.dbf blocksize=4096
DBVERIFY: Release 8.1.7.0.0 - Production on Fri Aug 29 12:23:12 2008
(c) Copyright 2000 Oracle Corporation. All rights reserved.
DBVERIFY - Verification starting : FILE = /oracle15/oradata/pindb/pinx054.dbf
Block Checking: DBA = 759492966, Block Type =
Found block already marked corrupted
Block Checking: DBA = 759492967, Block Type =
Found block already marked corrupted
Block Checking: DBA = 759492968, Block Type =
.DBVERIFY - Verification complete
Total Pages Examined : 1048576
Total Pages Processed (Data) : 0
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 585068
Total Pages Failing (Index): 0
Total Pages Processed (Other): 8709
Total Pages Empty : 454799
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
bash-2.05$ dbv file=/oracle15/oradata/pindb/pinx054.dbf blocksize=4096
DBVERIFY: Release 8.1.7.0.0 - Production on Fri Aug 29 12:32:28 2008
(c) Copyright 2000 Oracle Corporation. All rights reserved.
DBVERIFY - Verification starting : FILE = /oracle15/oradata/pindb/pinx055.dbf
Block Checking: DBA = 771822208, Block Type =
Found block already marked corrupted
Block Checking: DBA = 771822209, Block Type =
Found block already marked corrupted
Block Checking: DBA = 771822210, Block Type =
.DBVERIFY - Verification complete
Total Pages Examined : 1048576
Total Pages Processed (Data) : 0
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 157125
Total Pages Failing (Index): 0
Total Pages Processed (Other): 4203
Total Pages Empty : 887248
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
My doubts are :
1.if i drop the index and recreate the index with logging option will this error won't repeat in alert log file
2.in future if i activate the standby database will database is going to open without any error.
Thanks
Prakash
.

ORA-19566: exceeded limit of 999 corrupt blocks for file

Hi All,
I am new to Oracle RMAN & RAC Administration. Looking for your support to solve the below issue.
We have 2 disk groups - +ETDATA & +ETFLASH in our 3 node RAC environments in which RMAN is configured in node-2 to take backup. We do not have RMAN catalog and the RMAN is fetching information from control file.
Recently, the backup failed with the error ORA-19566: exceeded limit of 999 corrupt blocks for file +ETFLASH/datafile/users.6187.802328091.
We found that the datafiles are present in both disk groups and from the control file info, we got to know that the datafiles in +ETDATA are currently in use and +ETFLASH is having old datafiles.
RMAN> show all;
RMAN configuration parameters for database with db_unique_name LABWRKT are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 3 DAYS;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+ETFLASH/CONTROLFILE/snapcf_LABWRKT.f';
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+ETFLASH/controlfile/snapcf_labwrkt.f';
Above configuration shows that SNAPSHOT CONTROLFILE is pointing to +ETFLASH. So I changed the configuration with the SNAPSHOT CONTROLFILE points to '+ETDATA/controlfile/snapcf_labwrkt.f'. At the end of backup, SNAPSHOT file was created in +ETDATA and I was expecting it to be the copy of control file being used which has dbf located in +ETDATA. But still the backup was pointing to old datafiles in +ETFLASH. Since we dont have RMAN catalog, resync also is not possible.
When I ran it manually, it was successfull without any error and was pointing to the exisiting datafiles.
RMAN> backup database plus archivelog all;
I hope the issue will get resolved if the RMAN points only to the datafiles present in +ETDATA. If I am correct, please let me know how can i make it possible? Also please explain me why the newly created snapshot file does not reflect the existing control file info?

Hi,
I am getting an error from the DBA Planning Calendar every time the job ...
So when was your last successfull backup of this datafile. Check if still available.
If this is some time ago, and may be you are currently without any backup, try to backup without rman at once,
to have at least something to work with in case you get additional errors right now.
Then you need to find out what object is affected. You are on the right way already. You need the statement,
that goes to dba_extents to check what object the block belongs to.
Has the DB been recovered recently, so the block might possibly belong to an index created with nologging ?
(this could be the case on BW systems).
If the last good backup of that file is still available and the redologs belonging to this backup up to current time are as well, you could try to recover that file. But I'd do this only after a good backup without rman and by not destroying the original file.
If the last good backup was an rman backup, you can do a verify restore of that datafile in advance, to check if the corruption is really not inside the file to be restored.
Check out the -w (verify) option of brrestore first, to understand how it works.
(I am not sure it this is already available in version 7.00, may be you need to switch to 7.10 or 7.20)
brrestore -c -m /oracle/SHD/sapdata4/sr3_16/sr3.data16 -b xxxxxxxx.ffr -w only_rmv
You should do a dbv check of that file as well, to check if it gets more information. I.E if more blocks are
affected. rman stops right after the first corruption, but usually you have a couple of those in line, esp. if these are
zeroed ones. (This one would also work with version 7.00 brtools)
brbackup -c -u / -t online -m /oracle/SHD/sapdata4/sr3_16/sr3.data16 -w only_dbv
Good luck.
Volker

Corrupt block relative dba: 0x0041470c

Corrupt block relative dba: 0x0041470c (file 1, block 83724)
Fractured block found during buffer read
Data in bad block:
type: 6 format: 2 rdba: 0x0041470c
last change scn: 0x0009.90b485ad seq: 0x1 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x00000000
check value in block header: 0x3092
computed block checksum: 0x19de
Wed Oct 03 09:58:32 GMT-4 2012
Reread of rdba: 0x0041470c (file 1, block 83724) found same corrupted data
Wed Oct 03 09:58:32 GMT-4 2012
Errors in file /opt/oracle/admin/IXP/bdump/ixp_smon_19661.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-08103: object no longer exists

962800 wrote:
Corrupt block relative dba: 0x0041470c (file 1, block 83724)
Fractured block found during buffer read
Data in bad block:
type: 6 format: 2 rdba: 0x0041470c
last change scn: 0x0009.90b485ad seq: 0x1 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x00000000
check value in block header: 0x3092
computed block checksum: 0x19de
Wed Oct 03 09:58:32 GMT-4 2012
Reread of rdba: 0x0041470c (file 1, block 83724) found same corrupted data
Wed Oct 03 09:58:32 GMT-4 2012
Errors in file /opt/oracle/admin/IXP/bdump/ixp_smon_19661.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-08103: object no longer exists
Its not a corrupted block but a fractured block and also the object is not there anymore. So there is nothing that you are supposed to do.
Aman....

Corrupted blocks

Corrupted blocks are shown after runnıng dbv
but I cant see them from the
V$backup_corruption
v$database_block_corruption;
why?

Was dbv supposed to mark the block corrupt somewhere?
The V$DATABASE_BLOCK_CORRUPTION view indicates which blocks in a datafile were marked corrupt since the most recent BACKUP or BACKUP VALIDATE command was run.

Does a truncate table solve corrupt blocks in a table

Hi Guys,
Got a question:
Does a truncate table solve corrupt blocks in a table?
I have found corrupt blocks in rman, located them, they are in 1 table.
And contacted the business, and have permission to drop and recreate the table,
but my question is does truncate table drop storage also solves my problem?
And will it let me to do a full backup without set max corrupt blocks?
To my knowledge does a truncate table moves the high watermark to 0 + 1 extend, but I am unsure how this will effect the corrupt blocks.
Thanks in advance for your advice

Hi,
Yes truncate/drop table fixes the corruption at the database level. You may like to take the backup(if you have index on it) of that table so that you may restore it later if anything goes wrong.
Note: This would not fix any corruption at the disk level (like bad sectors).
Regards
Anurag

Error: ORA-00227 - Corrupt block detected in control file

Hey everybody,
I'm having problems with Oracle, here is the error displayed:
SQL> startup;
ORACLE instance started.
Total System Global Area 247463936 bytes
Fixed Size 1258244 bytes
Variable Size 92278012 bytes
Database Buffers 150994944 bytes
Redo Buffers 2932736 bytes
ORA-00227: corrupt block detected in control file: (block 16, # blocks 1)
ORA-00202: control file: '/usr/lib/oracle/xe/oradata/XE/control.dbf'
I wonder what I should do to solve this problem.
Could anyone help me?
Thanks

user10826800 wrote:
Hey everybody,
I'm having problems with Oracle, here is the error displayed:
SQL> startup;
ORACLE instance started.
Total System Global Area 247463936 bytes
Fixed Size 1258244 bytes
Variable Size 92278012 bytes
Database Buffers 150994944 bytes
Redo Buffers 2932736 bytes
ORA-00227: corrupt block detected in control file: (block 16, # blocks 1)
ORA-00202: control file: '/usr/lib/oracle/xe/oradata/XE/control.dbf'
I wonder what I should do to solve this problem.
Could anyone help me?
ThanksHi and welcome to the forum. Replace corrupted control file with non-corrupted one and start the database

Corrupt block error + valid data found ???

Hi,
I am getting a peculiar block corruption error in my production database (9.2.0.8).
It also says "valid data found". I am able to analyze the suspect table without any reported issues. Can any one please suggest?
Details from Alertlog below:-
Corrupt block relative dba: 0x01463cbf (file 5, block 408767)
Bad header found during user buffer read
Data in bad block -
type: 50 format: 0 rdba: 0x3a383020
last change scn: 0x0338.303a3630 seq: 0xc2 flg: 0x38
consistency value in tail: 0x36302036
check value in block header: 0x3c27, block checksum disabled
spare1: 0x30, spare2: 0x36, spare3: 0x1502
Reread of rdba: 0x01463cbf (file 5, block 408767) found valid data
Hex dump of Absolute File 5, Block 408768 in trace file d:\oracle\admin\fm\udump\fm_ora_5236.trc
---------------------------------------------------------------------------------------------

Hi,
May be this will help
Data block corruption…..
Regards
Jafar

Skipping Corrupt Block

Hi Gurus,
My alert log was showing a block corrupt and i repaired it with dbms utility. After this oracle starts generating a trace file in udump folder every minute which shows follwing error.
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
*** 2010-04-30 19:52:51.203
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
I don't so many trace files to be gerated . Can i do something .
Please help me.

Vivek Agarwal wrote:
Hi Gurus,
My alert log was showing a block corrupt and i repaired it with dbms utility. After this oracle starts generating a trace file in udump folder every minute which shows follwing error.
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
*** 2010-04-30 19:52:51.203
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
table scan: segment: file# 19 block# 67
skipping corrupt block file# 19 block# 79161
I don't so many trace files to be gerated . Can i do something .
Please help me.Dear Vivek. If you have used DBMS_REPAIR package, it means that you've marked those blocks corrupted and ORacle will bypass those blocks in I/O
Why you haven't used RMAN Block Media Recovery? You can watch my video tutorial on this: http://kamranagayev.wordpress.com/2010/03/18/rman-video-tutorial-series-performing-block-media-recovery-with-rman/
(And please don't tell me that you haven't taken RMAN backup if it's not a production database)
It's just a informatino written to the trace files that Oracle bypasses those data blocks
Read the following article :
http://www.askthegerman.com/archives/107
My Oracle Video Tutorials - http://kamranagayev.wordpress.com/oracle-video-tutorials/

ORA-19566: exceeded limit of 0 corrupt blocks

Hi All,
We have been encountering some issues with RMAN backup; it has been erroring out with same errors (max corrupt blocks). As of now, I ran the db verify for affected files and found that indexes are failing. When I tried to find out the indexes from extent views, I was unable to find it. Looks like these blocks are in free space as I found it and also the V$backup corruption view shows the logical corruption.
Waiting for you suggestion....
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
PL/SQL Release 10.2.0.3.0 - Production
CORE 10.2.0.3.0 Production
TNS for HPUX: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
RMAN LOG:
channel a3: starting piece 1 at 14-DEC-09
RMAN-03009: failure of backup command on a2 channel at 12/14/2009 05:43:42
ORA-19566: exceeded limit of 0 corrupt blocks for file /ub834/oradata/TERP/applsysd142.dbf
continuing other job steps, job failed will not be re-run
channel a2: starting incremental level 0 datafile backupset
channel a2: specifying datafile(s) in backupset
including current control file in backupset
channel a2: starting piece 1 at 14-DEC-09
channel a1: finished piece 1 at 14-DEC-09
piece handle=TERP_1769708180_level0_292_1_1_20091213065437.rmn tag=TAG20091213T065459 comment=API Version 2.0,MMS Version 5.0.0.0
channel a1: backup set complete, elapsed time: 01:14:45
channel a2: finished piece 1 at 14-DEC-09
piece handle=TERP_1769708180_level0_296_1_1_20091213065437.rmn tag=TAG20091213T065459 comment=API Version 2.0,MMS Version 5.0.0.0
channel a2: backup set complete, elapsed time: 00:24:54
RMAN-03009: failure of backup command on a4 channel at 12/14/2009 06:14:33
ORA-19566: exceeded limit of 0 corrupt blocks for file /ub834/oradata/TERP/applsysd143.dbf
continuing other job steps, job failed will not be re-run
released channel: a1
released channel: a2
released channel: a3
released channel: a4
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on a3 channel at 12/14/2009 06:41:00
ORA-19566: exceeded limit of 0 corrupt blocks for file /ub806/oradata/TERP/icxd01.dbf
Recovery Manager complete.
Thanks,
Vimlendu
Edited by: Vimlendu on Dec 20, 2009 10:27 AM

dbv file=/ora/oradata/binadb/RAT_TRANS_IDX01.dbf blocksize=8192
The result:
DBVERIFY: Release 10.2.0.3.0 - Production on Thu Nov 20 11:14:01 2003
(c) Copyright 2000 Oracle Corporation. All rights reserved.
DBVERIFY - Verification starting : FILE =
/ora/oradata/binadb/RAT_TRANS_IDX01.dbf
Block Checking: DBA = 75520968, Block Type = KTB-managed data block
**** row 80: key out of order
---- end index block validation
Page 23496 failed with check code 6401
DBVERIFY - Verification complete
Total Pages Examined : 34560
Total Pages Processed (Data) : 1
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 31084
Total Pages Failing (Index): 1
Total Pages Processed (Other): 191
Total Pages Empty : 3284
Total Pages Marked Corrupt : 0
Total Pages Influx : 0
Seems like I have 1 page failing. I try to run this script:
select segment_type, segment_name, owner
from sys.dba_extents
where file_id = 18 and 23496 between block_id
and block_id + blocks - 1;
No rows returned.
Then, I try to run this script:
Select tablespace_name, file_id, block_id, bytes
from dba_free_space
where file_id = 18
and 23496 between block_id and block_id + blocks - 1
Resulting 1 row.
Seems like I have the possible corrupt block on unused space.
Edited by: Vimlendu on Dec 20, 2009 2:30 PM
Edited by: Vimlendu on Dec 20, 2009 2:41 PM

Need to find the corrupted blocks.

Hi,
I am having blocks corruption(nologging) for the 11g database. Want to find the whether corrupted blocks are from indexes or from specific tables...

Thanx..
I am firing below query.
SELECT e.owner, e.segment_type, e.segment_name, e.partition_name, c.file#
, greatest(e.block_id, c.block#) corr_start_block#
, least(e.block_id+e.blocks-1, c.block#+c.blocks-1) corr_end_block#
, least(e.block_id+e.blocks-1, c.block#+c.blocks-1)
- greatest(e.block_id, c.block#) + 1 blocks_corrupted
, null description
FROM dba_extents e, v$database_block_corruption c
WHERE e.file_id = c.file#
AND e.block_id <= c.block# + c.blocks - 1
AND e.block_id + e.blocks - 1 >= c.block#
UNION
SELECT s.owner, s.segment_type, s.segment_name, s.partition_name, c.file#
, header_block corr_start_block#
, header_block corr_end_block#
, 1 blocks_corrupted
, 'Segment Header' description
FROM dba_segments s, v$database_block_corruption c
WHERE s.header_file = c.file#
AND s.header_block between c.block# and c.block# + c.blocks - 1
UNION
SELECT null owner, null segment_type, null segment_name, null partition_name, c.file#
, greatest(f.block_id, c.block#) corr_start_block#
, least(f.block_id+f.blocks-1, c.block#+c.blocks-1) corr_end_block#
, least(f.block_id+f.blocks-1, c.block#+c.blocks-1)
- greatest(f.block_id, c.block#) + 1 blocks_corrupted
, 'Free Block' description
FROM dba_free_space f, v$database_block_corruption c
WHERE f.file_id = c.file#
AND f.block_id <= c.block# + c.blocks - 1
AND f.block_id + f.blocks - 1 >= c.block#
order by file#, corr_start_block#;

Corrupt block methods

Similar Messages

Maybe you are looking for