DB block corruption by using OEM

1. OEM can discover database block corruption, but I wasn't sure if whether db_block_checking and db_block_checksum need to be set in order for OEM to discover corruption or we don't have to set this parameter.
2. If we set db_block_checksum and db_block_checking to TRUE, any performance impact?
Thanks,

Dear Satish,
Kindly let me know the option to schedule the backup Online instead of offline in EM.
I.e. My requirement is Backup need to be scheduled thru OEM without shutting down the DB.
Thanks in advance.

Similar Messages

Block Corruption discovered on OEM

I think I came across some article or document saying that OEM can discoverd block corruption within your DBs but I am not sure if I remember correctly (I am not talking about rman). Please confirm, and if it is capable of doing that, how can OEM discover?
Thanks,

Here you go
http://www.oracle.com/technology/obe/11gr1_db/ha/dra/dra.htm#t2
Hope this helps,
Regards,
http://www.oracleracexpert.com
Click here to [Send EMAIL using UTL_MAIL in Oracle 10g |http://www.oracleracexpert.com/2009/11/send-email-using-utlmail-in-oracle-10g.html]
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Javax.crypto.BadPaddingException: pad block corrupted when using Java 1.4

I'm getting a javax.crypto.BadPaddingException: pad block corrupted Exception while working on converting our existing java jdk 1.2 to java 1.4. Any suggestions would be great. Here are the specifics:
We have a web application that been running for 3+ years under java jdk 1.2 & jce_1_2.jar. Within the application we are exchanging data (XML) with a customer using the following encryption scheme:
1) We create a one time DESede key through the KeyGenerator class passing in ("DESede", "BC")
2) We encrypt the data with this one time key using ("DESede/ECB/PKCS5Padding", "BC")
3) This one time key is then encrypted using ("RSA/ECB/PKCS1Padding", "BC") and customer's public key
4) We create a signature with our private key, which they have the public key for.
This is process/api that we required to use for their API's and its worked fine under 1.2, with "ABA" as the provider. Now moving to 1.4, I'm using BouncyCastle as the provider.
Other differences, the keystore was created under 1.2 and in 1.2 it was defined as "JCEKS" provider "SunJCE" under 1.4 I changed them to "JKS" and "SUN" . I would get bad header exceptions when reading from the keystore until I changed it. I don't think its the BouncyCastle since I was able to download the 1.2 version of BC and get the existing app to work and I also got the 1.4 version of BC to work under the existing 1.2 application.
So something seems to be different with the algorithms/padding, but I can't seem to find it. I tried the following: "RSA" "RSA/ECB" "RSA//PKCS1Padding" "NoPadding" also changed the DESede algorithm with no luck. All I know is that its failing on the decryption of the one time key, since its failing on the customer side, I don't have much other insight into it, other then the exception that they sent me.
More info: getting error on Java: build 1.4.2_02-b03 on Solaris 5.8
Existing application running: Java JDK_1.2.2_10 on Solaris 5.8
BouncyCastle: bcprov-jdk14-124.jar
Thanks

Here is the stackTrace that I was sent:
20040804;10:29:37: javax.crypto.BadPaddingException: pad block corrupted
20040804;10:29:37: at org.bouncycastle.jce.provider.JCEBlockCipher.engineDo
Final(JCEBlockCipher.java:460)
20040804;10:29:37: at javax.crypto.Cipher.doFinal(Cipher.java:1129)
20040804;10:29:37: at com.customer.crypto.SymmetricCryptor.decrypt(SymmetricCryptor.java:105)
20040804;10:29:37: at com.customer.crypto.SymmetricCryptor.decryptToStr
ing(SymmetricCryptor.java:95)
20040804;10:29:37: at com.customer.api.Data.DataServlet doPost(DataServlet.java:88)

BadPaddingException: pad block corrupted when using Java 1.4

I'm getting a javax.crypto.BadPaddingException: pad block corrupted Exception while working on converting our existing java jdk 1.2 to java 1.4. Any suggestions would be great. Here are the specifics:
We have a web application that been running for 3+ years under java jdk 1.2 & jce_1_2.jar. Within the application we are exchanging data (XML) with a customer using the following encryption scheme:
1) We create a one time DESede key through the KeyGenerator class passing in ("DESede", "BC")
2) We encrypt the data with this one time key using ("DESede/ECB/PKCS5Padding", "BC")
3) This one time key is then encrypted using ("RSA/ECB/PKCS1Padding", "BC") and customer's public key
4) We create a signature with our private key, which they have the public key for.
This is process/api that we required to use for their API's and its worked fine under 1.2, with "ABA" as the provider. Now moving to 1.4, I'm using BouncyCastle as the provider.
Other differences, the keystore was created under 1.2 and in 1.2 it was defined as "JCEKS" provider "SunJCE" under 1.4 I changed them to "JKS" and "SUN" . I would get bad header exceptions when reading from the keystore until I changed it. I don't think its the BouncyCastle since I was able to download the 1.2 version of BC and get the existing app to work and I also got the 1.4 version of BC to work under the existing 1.2 application.
So something seems to be different with the algorithms/padding, but I can't seem to find it. I tried the following: "RSA" "RSA/ECB" "RSA//PKCS1Padding" "NoPadding" also changed the DESede algorithm with no luck. All I know is that its failing on the decryption of the one time key, since its failing on the customer side, I don't have much other insight into it, other then the exception that they sent me.
More info: getting error on Java: build 1.4.2_02-b03 on Solaris 5.8
Existing application running: Java JDK_1.2.2_10 on Solaris 5.8
BouncyCastle: bcprov-jdk14-124.jar
Here is the stackTrace that I was sent:
20040804;10:29:37: javax.crypto.BadPaddingException: pad block corrupted
20040804;10:29:37: at org.bouncycastle.jce.provider.JCEBlockCipher.engineDo
Final(JCEBlockCipher.java:460)
20040804;10:29:37: at javax.crypto.Cipher.doFinal(Cipher.java:1129)
20040804;10:29:37: at com.customer.crypto.SymmetricCryptor.decrypt(SymmetricCryptor.java:105)
20040804;10:29:37: at com.customer.crypto.SymmetricCryptor.decryptToStr
ing(SymmetricCryptor.java:95)
20040804;10:29:37: at com.customer.api.Data.DataServlet doPost(DataServlet.java:88)
Thanks

Well from what I read about this issue, seems the biggest issue is using the wrong keys. Well since this data exchange has been in production for 3+ years, I pretty certain its not the keys. To verify this i did:
1) From a server running JDK 1.2 and ran this process successfully, so I copied the keystore from this server to the server I was running 1.4 and reran the same data through. I still got the exception.
2) From another post I read about the difference in keys between older versions of Java and 1.4, so modifying the code listed and then exported my private key while running under 1.2 and created a new 1.4 keystore and imported this key & certificate. I'm still getting the exception.
Any ideas would be great.
Thanks

Oracle giving Block corruption errors when using CDC for sending the data to SQL Server 2012

Hello Friends,
We are facing an error while using CDC with Oracle. It is a "Block corruption" error, which indicates at some level of data corruption. We ran RMAN validate command to scan the database for corruption but it returned with no errors, however he
Alert Log in Oracle is still coming up with the following error. Has anyone experienced this error when using Oracle Standard Edition and SQL 2012 ?
Trace file e:\app\pulse-ad\diag\rdbms\orcl\orcl\trace\orcl_ora_5992.trc
Oracle Database 11g Release 11.1.0.7.0 - 64bit Production
Windows Server 2003 Version V5.2 Service Pack 2
CPU                 : 4 - type 8664, 4 Physical Cores
Process Affinity    : 0x0000000000000000
Memory (Avail/Total): Ph:6782M/24575M, Ph+PgF:12203M/30844M
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 151
Windows thread id: 5992, image: ORACLE.EXE (SHAD)
*** 2013-12-12 03:04:33.655
*** SESSION ID:(1281.3832) 2013-12-12 03:04:33.655
*** CLIENT ID:() 2013-12-12 03:04:33.655
*** SERVICE NAME:(orcl) 2013-12-12 03:04:33.655
*** MODULE NAME:(xdbcdcsvc.exe) 2013-12-12 03:04:33.655
*** ACTION NAME:() 2013-12-12 03:04:33.655
Lost-write detected for sequence 70856. The lost-write starts occurring in block 11193. The current block being validating is 12930.
Block dump of the first lost-write block:
Flag: 0x1 Format: 0x22 Block: 0x00002bb9 Seq: 0x000114bf Beg: 0x94 Cks:0x68ee
Dump of memory from 0x0000000598D06C00 to 0x0000000598D06E00
598D06C00 00002201 00002BB9 000114BF 68EE8094 [."...+.........h]
598D06C10 00085BF1 0023BDA1 000DE19C 000DE19C [.[....#.........]
598D06C20 0000000C 00000000 2209160A 5BF10000 [..........."...[]
598D06C30 3EB10502 00C0F5CA 0031BDA1 00010205 [...>......1.....]
598D06C40 02B22C6A 038A6D69 00000001 00000000 [j,..im..........]
598D06C50 4D554407 30373230 35BB0206 001100AE [.DUM0270...5....]
598D06C60 0001040A 000D000E 038A6D69 56B25735 [........im..5W.V]
598D06C70 729C0003 E19C0001 000C0006 000D0006 [...r............]
598D06C80 02BB0502 00C0F5CD 0023BDA1 000A0002 [..........#.....]
598D06C90 00C00013 000000D0 00030201 56B25736 [............6W.V]
598D06CA0 03890001 00000000 00000000 002E0105 [................]
598D06CB0 FFFF0003 00C0F5CD 56B25736 3EB10003 [........6W.V...>]
598D06CC0 FFFF0024 0014000C 000C0018 00120014 [$...............]
598D06CD0 09CC0058 E75B0022 0009000F 00085BF1 [X...".[......[..]
598D06CE0 0024BDA1 000DE19D 000DE19D 0000000C [..$.............]
598D06CF0 00000000 2309160A 5BF10000 3EB10502 [.......#...[...>]
598D06D00 00C0F5CD 0020BDA1 00010205 02B22C72 [...... .....r,..]
598D06D10 03900974 00000019 00000000 3030300A [t............000]
598D06D20 33303030 06323132 AE35BB02 0B441100 [0003212...5...D.]
598D06D30 0001040A 000D000E 03900974 56B25736 [........t...6W.V]
598D06D40 729C0003 E19D0011 000C0006 000D0006 [...r............]
598D06D50 02BB0502 00C0F5CD 0024BDA1 00EA0002 [..........$.....]
598D06D60 00270016 000001FC 00032C01 56B25736 [..'......,..6W.V]
598D06D70 00000001 00000000 30393007 002E0105 [.........090....]
598D06D80 FFFF0003 00C0F5CD 56B25736 00000003 [........6W.V....]
598D06D90 FFFF0025 00140052 000C0018 00070035 [%...R.......5...]
598D06DA0 0003000A 00070003 0001001D 00030001 [................]
598D06DB0 00010001 00010001 00010001 00010001 [................]
598D06DC0 00010001 00010001 00010001 00010001 [................]
598D06DD0 00010001 00000001 00010001 00010001 [................]
598D06DE0 00010001 00000014 09720174 00000022 [........t.r."...]
598D06DF0 0009000F 00085BF1 0025BDA1 000DE19A [.....[....%.....]
Block dump of the current block being validating:
Flag: 0x1 Format: 0x22 Block: 0x00003282 Seq: 0x000114c8 Beg: 0x0 Cks:0x312a
Dump of memory from 0x0000000598DDFE00 to 0x0000000598DE0000
598DDFE00 00002201 00003282 000114C8 312A8000 [."...2........*1]
598DDFE10 50424703 31303607 34353335 69745319 [.GBP.6015354.Sti]
598DDFE20 6E696C72 72502067 6375646F 4C207374 [rling Products L]
598DDFE30 4E206474 C3025650 0380013D 0457454E [td NPV..=...NEW.]
598DDFE40 4E1E09C2 1E09C204 10C2024E 1E09C204 [...N....N.......]
598DDFE50 09C2044E C2024E1E 03C30510 021B0929 [N....N......)...]
598DDFE60 C3053DC3 0F192602 2602C305 C3050F19 [.=...&.....&....]
598DDFE70 0C1A6203 5102C105 C2041F4E 044E1E09 [.b.....QN.....N.]
598DDFE80 4E1E09C2 0410C202 4E1E09C2 1E09C204 [...N.......N....]
598DDFE90 10C2024E 2903C305 78071B09 011D0B71 [N......)...xq...]
598DDFEA0 BF020101 1FBF0215 4E018001 53014E01 [...........N.N.S]
598DDFEB0 0723002C 0B0C7178 0A3C3C18 30303030 [,.#.xq...<<.0000]
598DDFEC0 33373030 4D033337 47034255 36075042 [007373.MUB.GBP.6]
598DDFED0 38333936 4E113331 2065776B 74616C50 [693813.Nkwe Plat]
598DDFEE0 6D756E69 56504E20 0B0AC303 4E038001 [inum NPV.......N]
598DDFEF0 C2045745 0459512E 59512EC2 5253C203 [EW...QY...QY..SR]
598DDFF00 512EC204 2EC20459 C2035951 C3055253 [...QY...QY..SR..]
598DDFF10 1B092903 0B0AC303 3C04C305 C3053239 [.).........<92..]
598DDFF20 32393C04 4F08C305 C105114F 1F4E5102 [.<92...OO....QN.]
598DDFF30 512EC204 2EC20459 C2035951 C2045253 [...QY...QY..SR..]
598DDFF40 0459512E 59512EC2 5253C203 2903C305 [.QY...QY..SR...)]
598DDFF50 78071B09 01190A71 C0030101 C0034709 [...xq........G..]
598DDFF60 8001330A 4E014E01 002C5301 71780723 [.3...N.N.S,.#.xq]
598DDFF70 3C180B0C 30300A3C 30303030 33373337 [...<<.0000007373]
598DDFF80 42554D03 50424703 31304207 344C5131 [.MUB.GBP.B011QL4]
598DDFF90 6F725020 63657073 614A2074 206E6170 [ Prospect Japan ]
598DDFFA0 646E7546 64724F20 44535520 30302E30 [Fund Ord USD0.00]
598DDFFB0 04C30331 03800133 0557454E 5B1603C3 [1...3...NEW....[]
598DDFFC0 03C30521 04215B16 1F4004C3 1603C305 [!....[!...@.....]
598DDFFD0 C305215B 215B1603 4004C304 03C3051F [[!....[!...@....]
598DDFFE0 031B0929 043304C3 4D245AC2 245AC204 [).....3..Z$M..Z$]
598DDFFF0 02C3054D 040A1A18 494002C1 1603C305 [M.........@I....]
*** 2013-12-12 03:05:07.984
** LOGMINER WARNING - Invalidated 6 LCRs **
Complete dump of first invalid START LCR follows:
++ LCR Dump Begin: 0x0000000532C004E0 - CANNOT_SUPPORT
     op: 255, Original op: 3, baseobjn: 0, objn: 233316, objv: 1
     DF: 0x00000002, DF2: 0x00000000, MF: 0x00000000, MF2: 0x00000000
     PF: 0x40000001, PF2: 0x00002000
     MergeFlag: 0x00, FilterFlag: 0x00
     Id: 0, iotPrimaryKeyCount: 3, numChgRec: 4
     NumCrSpilled: 0
     RedoThread#: 1, rba: 0x0114c8.0001c6ce.00d4
     scn: 0x0003.56b593be, xid: 0x0008.00c.00100d85, pxid: 0x0008.00c.00100d85
     ncol: 0newcount: 0, oldcount: 0
     LUBA: 0x3.c109c0.c.15.38f64
Thanks
Dee

Hi Dee,
Thank you for your question.
I am trying to involve someone more familiar with this topic for a further look at this issue. Sometime delay might be expected from the job transferring. Your patience is greatly appreciated.
Thank you for your understanding and support.
Regards,
Mike Yin
TechNet Community Support

Exception pad block corrupted using AESLight from BouncyCastle

Hi all!
I�m trying to encrypt and decrypt using AESLight from Bouncy Castle to provide cryptographi to my mobile application. I encrypt the text with no problems, and sometimes i decrypted with no problems to!
But, with some messages i got the follow exception:
org.bouncycastle.crypto.InvalidCipherTextException: pad block corrupted
     at org.bouncycastle.crypto.paddings.PKCS7Padding.padCount(Unknown Source)
     at org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher.doFinal(Unknown Source)
     at softcomex.sfw2go.server.seguranca.TranslatorAESLight.processMsg(TranslatorAESLight.java:40)
     at softcomex.sfw2go.server.Waiter.sendMessageToClient(Waiter.java:251)
     at softcomex.sfw2go.server.Waiter.run(Waiter.java:211)My class that uses AESLight:
public TranslatorAESLight (byte[] key, boolean cripto)
          this.keyAES = new byte[16];
          System.arraycopy(key, 0, this.keyAES, 0, key.length>16?16:key.length);
          this.cripto = cripto;
     }And, when I have to encrypt/decrypt i call the method processMsg:
public byte[] processMsg (String msg)
          byte[] msgReturn = null;
          int length = 0;
          BlockCipher engine = new AESLightEngine();
          BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine));
          KeyParameter key = new KeyParameter(keyAES);
          cipher.init(cripto, key);
          msgReturn = new byte[cipher.getOutputSize(msg.getBytes().length)];
          length = cipher.processBytes(msg.getBytes(), 0, msg.getBytes().length, msgReturn, 0);
          try {
               cipher.doFinal(msgReturn, length);
          } catch ( Exception e) {
               e.printStackTrace();
          return msgReturn;
     }Please, there is something wrong with this code?
Thanks.

I believe sabre150 has posted a good link in this
forum explaining why this doesn't work, but the
bottom line is that you cannot create a String from
an arbitrary byte array.I can't remember a single definitive reference (my memory is suspect these days) but I do have an example that shows why one should not try to convert bytes to a string using new String(bytes).
I got the basics of the Levenshtein algorithm on this forum somewhere but I can't find it. If anyone can give me the reference I will acknowledge it in the code.
import java.util.*;
import java.text.*;
import java.nio.charset.*;
public class BytesToStringErrorsDemonstration
    public static int levenshteinDistance( byte[] s, byte[] t)
        int n = s.length;
        int m = t.length;
        if (n == 0) return m;
        if (m == 0) return n;
        int[][] d = new int[n + 1][m + 1];
        for ( int i = 0; i <= n; d[0] = i++ );
for ( int j = 1; j <= m; d[0][j] = j++ );
for ( int i = 1; i <= n; i++ )
byte sc = s[ i-1 ];
for (int j = 1; j <= m;j++)
int v = d[i-1][j-1];
if ( t[ j-1 ] != sc ) v++;
d[i][j] = Math.min( Math.min( d[i-1][ j] + 1, d[i][j-1] + 1 ), v );
return d[n][m];
public static void main(String[] args)
// Create a set of random bytes
Random random = new Random();
byte[] originalBytes = new byte[2048];
random.nextBytes(originalBytes);
// Go through each supported character set
SortedMap<String,Charset> availableCharsets = Charset.availableCharsets();
for (String encoding : availableCharsets.keySet())
System.out.print(encoding);
// Turn the bytes into a String
String string;
try
string = new String(originalBytes, encoding);
catch (Exception e)
System.out.println(" - unable to convert bytes to String");
continue;
// Get back the bytes from the string
byte[] recoveredBytes;
try
recoveredBytes = string.getBytes(encoding);
catch (Exception e)
System.out.println(" - unable to convert String back to bytes");
continue;
// Test the original against the recovered
boolean areSame = Arrays.equals(originalBytes, recoveredBytes);
if (areSame)
System.out.println(" - no differences");
else
final DecimalFormat percentFormatter = new DecimalFormat("0.0");
int levenshteinCount = levenshteinDistance(originalBytes, recoveredBytes);
System.out.println(" - differences - Levenshtein count = " + levenshteinCount + " (" + percentFormatter.format(100.0 * levenshteinCount / originalBytes.length) + " %)");

Recover Block level corruption without using Rman

Dear All,
OS - OEL
DB - Oracle 10G
ORA-01578: ORACLE data block corrupted (file # 11, block # 16325)
ORA-01110: data file 11: '/oracle/PROD/fin_dev/data/fin08.dbf'
How we will recover it without using Rman?

If you are not using RMAN, you are using scripted backups. You take the datafile (or tablespace) offline, restore the backup of the datafile and recover the datafile using the SQLPlus commands.
Hemant K Chitale

Oracle 11g: Block Corruption in SYSAUX File

Hello All,
I am facing Data corruption issue in the SYSAUX file.
We are using Oracle 11G (Microsoft 32 bit) and our system is running in noarchivelog mode.
Following are the errors in the alert log.
e:\sc\sc15.2\databases\oracleconfig\diag\rdbms\enmscsdb\nm45\trace\nm45_p000_5944.trc
Corrupt block relative dba: 0x0088a9f8 (file 2, block 567800)
Fractured block found during buffer read
Data in bad block:
type: 6 format: 2 rdba: 0x0088a9f8
last change scn: 0x0000.0b3bb7c7 seq: 0x1 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0xc7000601
check value in block header: 0xee6b
computed block checksum: 0x72c6
Reread of rdba: 0x0088a9f8 (file 2, block 567800) found same corrupted data
Thu Jan 22 16:46:44 2009
SMON: Restarting fast_start parallel rollback
SMON: ignoring slave err,downgrading to serial rollback
ORACLE Instance nm45 (pid = 12) - Error 1578 encountered while recovering transaction (9, 11) on object 458.
Errors in file e:\sc\sc15.2\databases\oracleconfig\diag\rdbms\enmscsdb\nm45\trace\nm45_smon_6492.trc:
ORA-01578: ORACLE data block corrupted (file # 2, block # 567800)
ORA-01110: data file 2: 'E:\SC\SC15.2\DATABASES\ORACLECONFIG\SYSAUXNM45.ORA'
Thu Jan 22 16:46:45 2009
Trace dumping is performing id=[cdmp_20090122164645]
Corrupt Block Found
TSN = 1, TSNAME = SYSAUX
RFN = 2, BLK = 567800, RDBA = 8956408
OBJN = 458, OBJD = 458, OBJECT = I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST, SUBOBJECT =
SEGMENT OWNER = SYS, SEGMENT TYPE = Index Segment
Following query indicates the corruption is in index.
SQL> SELECT tablespace_name, segment_type, owner, segment_name FROM dba_extents
WHERE file_id = 2 and 567800 between block_id AND block_id + blocks - 1;
TABLESPACE_NAME SEGMENT_TYPE OWNER
SEGMENT_NAME
SYSAUX INDEX SYS
I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST
==============
DBverify output:
==============
E:\SC\SC15.2\Databases\OracleConfig>dbv file=SYSAUXNM45.ORA blocksize=8192
DBVERIFY: Release 11.1.0.7.0 - Production on Thu Jan 22 16:59:11 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
DBVERIFY - Verification starting : FILE = E:\SC\SC15.2\Databases\OracleConfig/SY
SAUXNM45.ORA
DBV-00200: Block, DBA 8956312, already marked corrupt
Page 567800 is influx - most likely media corrupt
Corrupt block relative dba: 0x0088a9f8 (file 2, block 567800)
Fractured block found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x0088a9f8
last change scn: 0x0000.0b3bb7c7 seq: 0x1 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0xc7000601
check value in block header: 0xee6b
computed block checksum: 0x72c6
DBVERIFY - Verification complete
Total Pages Examined : 1623864
Total Pages Processed (Data) : 540984
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 964944
Total Pages Failing (Index): 0
Total Pages Processed (Other): 17849
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 100086
Total Pages Marked Corrupt : 2
Total Pages Influx : 1
Total Pages Encrypted : 0
Highest block SCN : 190789648 (0.190789648)
SQL> select * from v$database_block_corruption;
FILE# BLOCK# BLOCKS CORRUPTION_CHANGE# CORRUPTIO
2 567800 1 0 FRACTURED
2 567704 1 0 FRACTURED
How to resolve this issue.
Thanks
With Regards
Hemant Joshi.

Drop and re-creating the index would be better than re-building the index.
Check the metalink note: Identify the corruption extension using RMAN/DBV/ANALYZE etc - 836658.1
Note 28814.1 - Handling Oracle Block Corruptions in Oracle7/8/8i/9i/10g
Note 472231.1 - How to identify all the Corrupted Objects in the Database reported by RMAN
ORA-1578 Main Reference Index for Solutions -830997.1

Need advice on ORA-01578: ORACLE data block corrupted

We have a development database server version- 10.2.0.3 with materialized views refresh as complete every morning. Yesterday we had a power failure and the server went down and database was shutdown unexpectedly.
When we restarted the database after the server restarted, we found some of the datablocks got corrupted . Following were the exceptions that we saw in the alert.log.
Errors in file /i01_01/app/oracle/product/10.2.0/db_1/admin/orcl9/bdump/orcl9_smon_7547.trc:
ORA-01578: ORACLE data block corrupted (file # 11, block # 257712)
ORA-01110: data file 11: '/i01_01/app/oracle/product/10.2.0/oradata/orcl9/ts_gen_data_02.dbf'
ORACLE Instance orcl9 (pid = 8) - Error 1578 encountered while recovering transaction (9, 38) on object 54463
I tried the following query to see the segment type.
select owner, segment_name, segment_type from dba_extents where file_id =11 and 257712 between block_id and block_id + blocks - 1;
OWNER
SEGMENT_NAME
SEGMENT_TYPE
VISH
INVENTORY_TXN
TABLE
where " INVENTORY_TXN " is a materialized view that was using the block that got corrupted. I can always recreate the MV by dropping and recreating it. Will it solve the problem???
If not, how can I recover/repair the block.???
Can anyone advice on this. Thanks very much in advance.

To recover a corrupted block,the best way out is to use Blockrecover command of RMAN. So you would need RmAN backup to perform the operation.But first ypu you need to ensure that this is a persistent error or not? Is this error is coming repeatedly or just once it happened?
About Blockrecover command,read here,
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmrecov005.htm#BRADV157
HTH
Aman....

BLOCK CORRUPTION (ORA-1578) 처리 (ORACLE 8I NEW FEATURE)

제품 : ORACLE SERVER
작성날짜 : 2002-05-31
BLOCK CORRUPTION (ORA-1578) 처리 (ORACLE 8I NEW FEATURE)
========================================================
PURPOSE
Block Corruption의 처리 방안에 대해 알아본다.
Problem Description
block corruption 시 10210, 10211,10231 의 event 를 사용해서
해당 block 을 skip 할 수도 있지만 V8.1 이상에서는
dbms_repair.fix_corrupt_blocks ,
dbms_repair.skip_corrupt_block 를 이용하여
corrupt가 발생한 block을 detect하고 skip, 또는 repair해주는 방안이
제시되고 있다.
Workaround
Solution Description
- 먼저 detecting 을 위해 db_block_checking =true 를 init.ora 에 set
- dbms_repair 의 package 를 사용하는데 이 package 는 dbmsrpr.sql,
prvtrpr.plb를 수행한다 .
- sys 로 접속하여 package 를 실행한다.
다음의 예제를 살펴보자
T1 테이블에 corrupt 된 block 이 있다고 가정한다.
SQL> desc t1
Name Null? Type
COL1 NOT NULL NUMBER(38)
COL2 CHAR(512)
SQL> analyze table t1 validate structure;
analyze table t1 validate structure
ERROR at line 1:
ORA-01498: block check failure - see trace file
이때 ANALYZE로 부터 발생된 trace file 에 corrupt 된 block 에 3 row 의
(nrows = 3) data 가 있음을 알수 있다고 가정하자.
DBMS_REPAIR.ADMIN_TABLES (repair and orphan key)
================================================
ADMIN_TABLES 은 table 을 위한 repair table과,인덱스를 위한 orphan key
tables을 제공한다.
SQL> @adminCreate
SQL> connect sys/change_on_install
Connected.
SQL>
SQL> -- Repair Table
SQL>
SQL> declare
2 begin
3 -- Create repair table
4 dbms_repair.admin_tables (
5 -- table_name => 'REPAIR_TABLE',
6 table_type => dbms_repair.repair_table,
7 action => dbms_repair.create_action,
8 tablespace => 'USERS'); -- default TS of SYS if not specified
9 end;
10 /
PL/SQL procedure successfully completed.
SQL> select owner, object_name, object_type
2 from dba_objects
3 where object_name like '%REPAIR_TABLE';
OWNER OBJECT_NAME OBJECT_TYPE
SYS DBA_REPAIR_TABLE VIEW
SYS REPAIR_TABLE TABLE
SQL>
SQL> -- Orphan Key Table
SQL>
SQL> declare
2 begin
3 -- Create orphan key table
4 dbms_repair.admin_tables (
5 table_type => dbms_repair.orphan_table,
6 action => dbms_repair.create_action,
7 tablespace => 'USERS'); -- default TS of SYS if not specified
8 end;
9 /
PL/SQL procedure successfully completed.
SQL> select owner, object_name, object_type
2 from dba_objects
3 where object_name like '%ORPHAN_KEY_TABLE';
OWNER OBJECT_NAME OBJECT_TYPE
SYS DBA_ORPHAN_KEY_TABLE VIEW
SYS ORPHAN_KEY_TABLE TABLE
DBMS_REPAIR.CHECK_OBJECT
=========================
CHECK_OBJECT procedure 는 기술된 object를 check 하고, repair 를 위한 정보를 수집하기 위함이다.
SQL> @checkObject
SQL> set serveroutput on
SQL>
SQL> declare
2 rpr_count int;
3 begin
4 rpr_count := 0;
5 dbms_repair.check_object (
6 schema_name => 'SYSTEM',
7 object_name => 'T1',
8 repair_table_name => 'REPAIR_TABLE',
9 corrupt_count => rpr_count);
10 dbms_output.put_line('repair count: ' || to_char(rpr_count));
11 end;
12 /
repair count: 1
PL/SQL procedure successfully completed.
SQL> desc repair_table
Name Null? Type
OBJECT_ID NOT NULL NUMBER
TABLESPACE_ID NOT NULL NUMBER
RELATIVE_FILE_ID NOT NULL NUMBER
BLOCK_ID NOT NULL NUMBER
CORRUPT_TYPE NOT NULL NUMBER
SCHEMA_NAME NOT NULL VARCHAR2(30)
OBJECT_NAME NOT NULL VARCHAR2(30)
BASEOBJECT_NAME VARCHAR2(30)
PARTITION_NAME VARCHAR2(30)
CORRUPT_DESCRIPTION VARCHAR2(2000)
REPAIR_DESCRIPTION VARCHAR2(200)
MARKED_CORRUPT NOT NULL VARCHAR2(10)
CHECK_TIMESTAMP NOT NULL DATE
FIX_TIMESTAMP DATE
REFORMAT_TIMESTAMP DATE
SQL> select object_name, block_id, corrupt_type, marked_corrupt,
2 corrupt_description, repair_description
3 from repair_table;
OBJECT_NAME BLOCK_ID CORRUPT_TYPE MARKED_COR
CORRUPT_DESCRIPTION
REPAIR_DESCRIPTION
T1 3 1 FALSE
kdbchk: row locked by non-existent transaction
table=0 slot=0
lockid=32 ktbbhitc=1
mark block software corrupt
Data Extraction
===============
repair table에 의하면 file 6 ,block 3 에 corrupt 이 났음을 알수 있다
그러나 아직 이 block 은 corrupt 로 mark 되어 있지 않으므로 필요 data 를
추출하여야 한다.
1. ALTER SYSTEM DUMP (nrows = 3) 에 의해 block안에 있는 row수를 결정한다.
2. corrupt object를 select 하여 가능한 정보를 추출한다.
SQL> -- The following query can be used to salvage data from a corrupt block.
SQL> -- Creating a temporary table facilitates data insertion.
SQL> create table temp_t1 as
2 select * from system.t1
3 where dbms_rowid.rowid_block_number(rowid) = 3
4 and dbms_rowid.rowid_to_absolute_fno (rowid, 'SYSTEM','T1') = 6;
Table created.
SQL> select col1 from temp_t1;
COL1
2
3
DBMS_REPAIR.FIX_CORRUPT_BLOCKS (ORA-1578)
============================================
FIX_CORRUPT_BLOCKS procedure는 repair table 의 정보를 이용하여 corrupt
blocks 을 fix 한다
그러나 아직 full table scan 시 여전히 error 가 발생한다
SQL> declare
2 fix_count int;
3 begin
4 fix_count := 0;
5 dbms_repair.fix_corrupt_blocks (
6 schema_name => 'SYSTEM',
7 object_name => 'T1',
8 object_type => dbms_repair.table_object,
9 repair_table_name => 'REPAIR_TABLE',
10 fix_count => fix_count);
11 dbms_output.put_line('fix count: ' || to_char(fix_count));
12 end;
13 /
fix count: 1
PL/SQL procedure successfully completed.
SQL> select object_name, block_id, marked_corrupt
2 from repair_table;
OBJECT_NAME BLOCK_ID MARKED_COR
T1 3 TRUE
SQL> select * from system.t1;
select * from system.t1
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 3)
ORA-01110: data file 6: '/tmp/ts_corrupt.dbf'
DBMS_REPAIR.DUMP_ORPHAN_KEYS
==============================
DUMP_ORPHAN_KEYS는 corrupt data 에 해당하는 index 를 나타내 준다
SQL> select index_name from dba_indexes
2 where table_name in (select distinct object_name from repair_table);
INDEX_NAME
T1_PK
SQL> @dumpOrphanKeys
SQL> set serveroutput on
SQL>
SQL> declare
2 key_count int;
3 begin
4 key_count := 0;
5 dbms_repair.dump_orphan_keys (
6 schema_name => 'SYSTEM',
7 object_name => 'T1_PK',
8 object_type => dbms_repair.index_object,
9 repair_table_name => 'REPAIR_TABLE',
10 orphan_table_name => 'ORPHAN_KEY_TABLE',
11 key_count => key_count);
12 dbms_output.put_line('orphan key count: ' || to_char(key_count));
13 end;
14 /
orphan key count: 3
PL/SQL procedure successfully completed.
SQL> desc orphan_key_table
Name Null? Type
SCHEMA_NAME NOT NULL VARCHAR2(30)
INDEX_NAME NOT NULL VARCHAR2(30)
IPART_NAME VARCHAR2(30)
INDEX_ID NOT NULL NUMBER
TABLE_NAME NOT NULL VARCHAR2(30)
PART_NAME VARCHAR2(30)
TABLE_ID NOT NULL NUMBER
KEYROWID NOT NULL ROWID
KEY NOT NULL ROWID
DUMP_TIMESTAMP NOT NULL DATE
SQL> select index_name, count(*) from orphan_key_table
2 group by index_name;
INDEX_NAME COUNT(*)
T1_PK 3
Note: orphan key table의 index 는 다시 rebuild 되어야 한다.
DBMS_REPAIR.SKIP_CORRUPT_BLOCKS
===============================
SKIP_CORRUPT_BLOCKS 은 table 과 index 의 corrupt block 을 skip 하는 것을 enable/disable 을 실시한다.
Suggestion: SKIP_CORRUPT_BLOCKS 가 enabled되면 orphan key table의 모든
index 는 모두 rebuild 되어야 한다. ( all index associated with object
if DUMP_ORPHAN_KEYS was omitted).
SQL> @skipCorruptBlocks
SQL> declare
2 begin
3 dbms_repair.skip_corrupt_blocks (
4 schema_name => 'SYSTEM',
5 object_name => 'T1',
6 object_type => dbms_repair.table_object,
7 flags => dbms_repair.skip_flag);
8 end;
9 /
PL/SQL procedure successfully completed.
SQL> select table_name, skip_corrupt from dba_tables
2 where table_name = 'T1';
TABLE_NAME SKIP_COR
T1 ENABLED
SQL> -- rows in corrupt block skipped, no errors on full table scan
SQL> select * from system.t1;
COL1 COL2
4 dddd
5 eeee
--> Notice the pk index has not yet been corrected.
SQL> insert into system.t1 values (1,'aaaa');
insert into system.t1 values (1,'aaaa')
SQL> select * from system.t1 where col1 = 1;
no rows selected
DBMS_REPAIR.REBUILD_FREELISTS
===============================
REBUILD_FREELISTS rebuilds freelists for the specified object.
SQL> declare
2 begin
3 dbms_repair.rebuild_freelists (
4 schema_name => 'SYSTEM',
5 object_name => 'T1',
6 object_type => dbms_repair.table_object);
7 end;
8 /
PL/SQL procedure successfully completed.
Rebuild Index
=============
Note: Every index identified in the orphan key table should be rebuilt to
ensure consistent results.
SQL> alter index system.t1_pk rebuild online;
Index altered.
SQL> insert into system.t1 values (1, 'aaaa');
1 row created.
SQL> select * from system.t1;
COL1 COL2
4 dddd
5 eeee
1 aaaa
Reference Document
------------------

Try look to alert<SID>.log file for full error report (you could paste it here).
Also from alert log you could get real values for db_block_buffers and shared_pool_size parameters that used during instance startup.

Diff between logical and physical block corruption

What is the difference between Physical and Logical block corruption.
Dbverify utility, analyze command is used to check the logical block corruption not the physical one am i correct??
When i get
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'
How to conform that this a logical or physical block corruption???
please through some light regarding this....
kumaresh

the following link may help u
http://download-east.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmconc1012.htm

System datafile block corruption - no backups and database in NOARCHIVELOG mode

Dear All,
Database version - oracle 11.1 Enterprise
OS - RHELinux 5.8
What are the options of recovering from physical block corruption when there are no backup available to perform block media recovery?
V$DATABASE_BLOCK_CORRUPTION reports two segments corrupted (please see attached image for details).
1 table in system datafile - sys_fba_barrierscn
1 index - (applicaiton index)
What are my options?
I know there is a possibility that the database will not restart after a shutdown due to corruption in system tablespace.
Database is in noarchivelog mode. So online backups are not possible and there aren't any full backups either.
I am thinking of below,
1. Run dbms_repair with fix_block_corruption. - Still database startup might fail?
2. Shutdown the database and take offline full backup with RMAN MAXCorrupt option.
Appreciate your suggestions and advises.
Thanks
Stefan

Thanks Sybrand,
Agree with your first two suggestions .
Also scheduled a expdp job tonight. (Only backup like thing they had was a expdp cron, but until today all the large tables were failing due to small undo_retention).
Yes. Flashback is not used. So hopefully it will not affect the a database restart i guess?
Related to dbms_repair, I was referring to - http://askdba.org/weblog/2010/08/physical-corruption-ora-1578-part-3/.
Where DBMS_REPAIR.FIX_CORRUPT_BLOCKS and DBMS_REPAIR.SKIP_CORRUPT_BLOCKS used.
Which i think will not use any redo.
Thanks
Stefan

How to find the corrupted files using javascript?

Hi all,
I need to run batch of files some of which were corrupted?? instead of using the method "the files which were not opened are corrupted" is there any way to find the corrupted files??
I need to find this using javascript or apple script??
Please some one help me..
Regards,
subha

We found one datafile has corrupted by using dbv.dbv would have reported the block ids (block numbers) that are corrupted.
query dba_extents to identify the segments that contain such blocks.

Data Block Corruption

I'm on 9i R2 Patch 7 on a Microsoft Windows Server 2003.
How do you fix data block corruption in a Table?
Is the some way to retrieve the data from the Table drop it then recreate and reimport the data?
or do you have to succumb with restoring the Database from the last known good backup?

Hey, you can do the BMR (Block Media Recovery).
Since block corruption is to few subsets of blocks, i.e. a single table, you dont need to restore from the previous valid backup, you can simply do the following to achieve BMR.
Connect to rman and run the following:
run{ backup validate database};
Once the above commend is finishes, exit from RMAN and connect to the database as / as sysdba and use the following view to know the details required for BMR.
select * from V$backup_corruption;
The above queries gives you file# and block# information. Once you have the information do the BMR using following command at the RMAN prompt:
run {blockrecover datafile # block #};
# : indicated the datafile number and block number from the above view.
Let me know if you have any further issues.
You can also use view V$DATABASE_BLOCK_CORRUPTION to view the file# and corrupted blocks information.
Jaffar

Finding and fixing block corruption in oracle 10g

10.2.0.5.6
OS: Hp-unix
databases files on RAW.
DB Size: 10 TBs+
We had a SAN outage recently. The DB is back online. We want to check for block corruption to be on the safe side. We are planning to take a SAN EMC BCV copy of prod to run this. Looking for opinioms on the best way.Production is up and running. This is just a sanity check.
We are NOT using RMAN for backups. We do a BCV copy and then back that up and archive logs to tape.
RMAN: Can we do this from the control files? Do we have to set anything up? Is this the best way?
DBMS_REPAIR: I have not used this. We don't even have the package installed. I can install it.
DB_VERIFY: not sure if this is a good option or not. Is this current? I know I'll have to do it file by file and grep the logs. I have used this in the past, but its been a while.
Performance issues, CPU, I/O don't matter. We are doing a BCV copy and then mounting the DB on a new server.

Guess2 wrote:
10.2.0.5.6
OS: Hp-unix
databases files on RAW.
DB Size: 10 TBs+
We had a SAN outage recently. The DB is back online. We want to check for block corruption to be on the safe side. We are planning to take a SAN EMC BCV copy of prod to run this. Looking for opinioms on the best way.Production is up and running. This is just a sanity check.
We are NOT using RMAN for backups. We do a BCV copy and then back that up and archive logs to tape.
RMAN: Can we do this from the control files? Do we have to set anything up? Is this the best way?
DBMS_REPAIR: I have not used this. We don't even have the package installed. I can install it.
DB_VERIFY: not sure if this is a good option or not. Is this current? I know I'll have to do it file by file and grep the logs. I have used this in the past, but its been a while.
Performance issues, CPU, I/O don't matter. We are doing a BCV copy and then mounting the DB on a new server.
bcm@bcm-laptop:~$ dbv -help
DBVERIFY: Release 11.2.0.1.0 - Production on Mon May 21 07:29:42 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates. 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)           can be done against any datafile; open or closed, production or clone
Handle:     Guess2
Status Level:     Newbie
Registered:     Aug 5, 2000
Total Posts:     454
Total Questions:     212 (201 unresolved)
WHY so MANY unanswered questions?
Edited by: sb92075 on May 21, 2012 7:31 AM

DB block corruption by using OEM

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