Inconsistent recovery of data file headers and inconsistent recovery of Data Headers

Inconsistent recovery of data file headers and inconsistent recovery of Data Headers

SYS@orcl11g>alter database datafile 6 online;alter database datafile 6 online*ERROR at line 1:ORA-01113: file 6 needs media recoveryORA-01110: data file 6: '/opt/oracle/oradata/orcl11g/zbdba01.dbf'

Sometimes, after offline data files, we need to restore the media online.

SYS@orcl11g>select file#,name,status from v$datafile;     FILE# NAME                                                         STATUS---------- ------------------------------------------------------------ ------------------------------------------------------------         1 /opt/oracle/oradata/orcl11g/system01.dbf                     SYSTEM         2 /opt/oracle/oradata/orcl11g/sysaux01.dbf                     ONLINE         3 /opt/oracle/oradata/orcl11g/undotbs01.dbf                    ONLINE         4 /opt/oracle/oradata/orcl11g/users01.dbf                      ONLINE         5 /opt/oracle/oradata/orcl11g/zbdba.dbf                        ONLINE         6 /opt/oracle/oradata/orcl11g/zbdba01.dbf                      RECOVER         7 /opt/oracle/oradata/orcl11g/test.dbf                         ONLINE

However, the archive has been lost and the media cannot be restored:

SYS@orcl11g>recover datafile 6;ORA-00279: change 1986632 generated at 10/28/2014 05:16:11 needed for thread 1ORA-00289: suggestion : /opt/oracle/flash_recovery_area/ORCL11G/archivelog/2014_10_28/o1_mf_1_74_b4yqrglr_.arcORA-00280: change 1986632 for thread 1 is in sequence #74Specify log: {<RET>=suggested | filename | AUTO | CANCEL}ORA-00308: cannot open archived log '/opt/oracle/flash_recovery_area/ORCL11G/archivelog/2014_10_28/o1_mf_1_74_b4yqrglr_.arc'ORA-27037: unable to obtain file statusLinux-x86_64 Error: 2: No such file or directoryAdditional information: 3

At this time, we directly modify the file header for online:

[oracle@ogg1 lib]$ bbed parfile=par.txtPassword:BBED: Release 2.0.0.0.0 - Limited Production on Tue Oct 28 05:20:19 2014Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.************* !!! For Oracle Internal Use only !!! ***************BBED>BBED>BBED> info allFile#  Name                                                        Size(blks)-----  ----                                                        ----------     1  /opt/oracle/oradata/orcl11g/system01.dbf                             0     2  /opt/oracle/oradata/orcl11g/sysaux01.dbf                             0     3  /opt/oracle/oradata/orcl11g/undotbs01.dbf                            0     4  /opt/oracle/oradata/orcl11g/users01.dbf                              0     5  /opt/oracle/oradata/orcl11g/zbdba.dbf                                0     6  /opt/oracle/oradata/orcl11g/zbdba01.dbf                              0     7  /opt/oracle/oradata/orcl11g/test.dbf                                 0BBED> set file 1 block 1        FILE#           1        BLOCK#          1BBED> p kcvfhckpstruct kcvfhckp, 36 bytes                   @484       struct kcvcpscn, 8 bytes                 @484          ub4 kscnbas                           @484      0x001e526c      ub2 kscnwrp                           @488      0x0000   ub4 kcvcptim                             @492      0x3362e202   ub2 kcvcpthr                             @496      0x0001   union u, 12 bytes                        @500          struct kcvcprba, 12 bytes             @500             ub4 kcrbaseq                       @500      0x0000004d         ub4 kcrbabno                       @504      0x000001a6         ub2 kcrbabof                       @508      0x0010   ub1 kcvcpetb[0]                          @512      0x02   ub1 kcvcpetb[1]                          @513      0x00   ub1 kcvcpetb[2]                          @514      0x00   ub1 kcvcpetb[3]                          @515      0x00   ub1 kcvcpetb[4]                          @516      0x00   ub1 kcvcpetb[5]                          @517      0x00   ub1 kcvcpetb[6]                          @518      0x00   ub1 kcvcpetb[7]                          @519      0x00BBED> p kcvfhcpcub4 kcvfhcpc                                @140      0x000000f9BBED> p kcvfhcccub4 kcvfhccc                                @148      0x000000f8BBED> set file 6 block 1        FILE#           6        BLOCK#          1BBED> p kcvfhckpstruct kcvfhckp, 36 bytes                   @484       struct kcvcpscn, 8 bytes                 @484          ub4 kscnbas                           @484      0x001e5048      ub2 kscnwrp                           @488      0x0000   ub4 kcvcptim                             @492      0x3362e11b   ub2 kcvcpthr                             @496      0x0001   union u, 12 bytes                        @500          struct kcvcprba, 12 bytes             @500             ub4 kcrbaseq                       @500      0x0000004a         ub4 kcrbabno                       @504      0x00005801         ub2 kcrbabof                       @508      0x0010   ub1 kcvcpetb[0]                          @512      0x02   ub1 kcvcpetb[1]                          @513      0x00   ub1 kcvcpetb[2]                          @514      0x00   ub1 kcvcpetb[3]                          @515      0x00   ub1 kcvcpetb[4]                          @516      0x00   ub1 kcvcpetb[5]                          @517      0x00   ub1 kcvcpetb[6]                          @518      0x00   ub1 kcvcpetb[7]                          @519      0x00BBED> p kcvfhcpcub4 kcvfhcpc                                @140      0x0000043cBBED> p kcvfhcccub4 kcvfhccc                                @148      0x0000043bBBED> modify /x 6c52 offset 484Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) yFile: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 1                Offsets:  484 to  995           Dba:0x01800001------------------------------------------------------------------------6c521e00 00000000 1be16233 01000000 4a000000 01580000 10000000 0200000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 000000000d000d00 0d000100 00000000 00000000 00000000 02008001 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000<32 bytes per line>BBED> modify /x 02e2 offset 492File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 1                Offsets:  492 to 1003           Dba:0x01800001------------------------------------------------------------------------02e26233 01000000 4a000000 01580000 10000000 02000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 0d000d00 0d00010000000000 00000000 00000000 02008001 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000<32 bytes per line>BBED> modify /x f900 offset 140File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 1                Offsets:  140 to  651           Dba:0x01800001------------------------------------------------------------------------f9000000 7fe16233 3b040000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000006000000 05005a42 44424100 00000000 00000000 00000000 00000000 0000000000000000 06000000 00000000 00000000 a3d96233 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 6b946b29 01000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 6c521e00 0000000002e26233 01000000 4a000000 01580000 10000000 02000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 0d000d00 0d000100<32 bytes per line>BBED> modify /x f800 offset 148File: /opt/oracle/oradata/orcl11g/zbdba01.dbf (6)Block: 1                Offsets:  148 to  659           Dba:0x01800001------------------------------------------------------------------------f8000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 06000000 05005a4244424100 00000000 00000000 00000000 00000000 00000000 00000000 0600000000000000 00000000 a3d96233 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 6b946b29 01000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 6c521e00 00000000 02e26233 010000004a000000 01580000 10000000 02000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 00000000 00000000 00000000 0000000000000000 00000000 00000000 00000000 0d000d00 0d000100 00000000 00000000<32 bytes per line>BBED> sum applyCheck value for File 6, Block 1:current = 0x1924, required = 0x1924BBED> verifyDBVERIFY - Verification startingFILE = /opt/oracle/oradata/orcl11g/zbdba01.dbfBLOCK = 1DBVERIFY - Verification completeTotal Blocks Examined         : 1Total Blocks Processed (Data) : 0Total Blocks Failing   (Data) : 0Total Blocks Processed (Index): 0Total Blocks Failing   (Index): 0Total Blocks Empty            : 0Total Blocks Marked Corrupt   : 0Total Blocks Influx           : 0Message 531 not found;  product=RDBMS; facility=BBEDBBED> show all        FILE#           6        BLOCK#          1        OFFSET          148        DBA             0x01800001 (25165825 6,1)        FILENAME        /opt/oracle/oradata/orcl11g/zbdba01.dbf        BIFILE          bifile.bbd        LISTFILE        filelist.txt        BLOCKSIZE       8192        MODE            Edit        EDIT            Unrecoverable        IBASE           Dec        OBASE           Dec        WIDTH           80        COUNT           512        LOGFILE         log.bbd        SPOOL           NoBBED> p kcvfhckpstruct kcvfhckp, 36 bytes                   @484       struct kcvcpscn, 8 bytes                 @484          ub4 kscnbas                           @484      0x001e526c      ub2 kscnwrp                           @488      0x0000   ub4 kcvcptim                             @492      0x3362e202   ub2 kcvcpthr                             @496      0x0001   union u, 12 bytes                        @500          struct kcvcprba, 12 bytes             @500             ub4 kcrbaseq                       @500      0x0000004a         ub4 kcrbabno                       @504      0x00005801         ub2 kcrbabof                       @508      0x0010   ub1 kcvcpetb[0]                          @512      0x02   ub1 kcvcpetb[1]                          @513      0x00   ub1 kcvcpetb[2]                          @514      0x00   ub1 kcvcpetb[3]                          @515      0x00   ub1 kcvcpetb[4]                          @516      0x00   ub1 kcvcpetb[5]                          @517      0x00   ub1 kcvcpetb[6]                          @518      0x00   ub1 kcvcpetb[7]                          @519      0x00BBED> p kcvfhcpcub4 kcvfhcpc                                @140      0x000000f9BBED> p kcvfhcccub4 kcvfhccc                                @148      0x000000f8BBED> 

After the modification, we will restore the data file again:

SYS@orcl11g>startupORACLE instance started.Total System Global Area  417546240 bytesFixed Size                  2213936 bytesVariable Size             318769104 bytesDatabase Buffers           92274688 bytesRedo Buffers                4288512 bytesDatabase mounted.Database opened.SYS@orcl11g>recover datafile 6;Media recovery complete.SYS@orcl11g>alter database datafile 6 online;Database altered.

The image folders deleted a year ago cannot be recovered now. Is it true that the image folders cannot be recovered once the data is overwritten,

It's not that the image is hard to recover, but that's because the interval is too long. First, on which disk is your image folder originally stored? If there is no hope in disk C, it must have been overwritten. Because disk C is a system disk, even if you do not write or download, the system constantly generates some temporary files, so it is difficult to retrieve the lost files on drive C. If you have not written data to another disk within one year, there is still hope to restore it. If the folder you deleted is not on disk C, you can download a data recovery wizard from the Internet to try. The recovery capability of this software is quite strong. You can restore it by file type. If you cannot even scan the file you want, most of them are covered and cannot be recovered.

I used easyrecovery to restore data and formatted it twice. However, I found that the total file size is different ......

Easyrecovery has a default setting that does not recover from a deleted disk, so it cannot be recovered. However, disk information stores deleted files, this time, after you read and write the file information is destroyed, the amount of recovery can be reduced, and easyrecovery itself is only a civil information restoration software, which is less efficient, generally, you can only recover the source disk that has been deleted and written three times later, so it won't work. Currently, in addition to a few restoration software in Germany, there are also some restoration software available in Russia. I will give you a name, search by yourself. If you have a lot of money, you can consider professional repair and use special equipment for professional repair. The price is about 2000 yuan for 3G data, the restoration effect is ideally close to that of the military two years ago. The following are the software names: Acronis_Backup_and_Recovery and AltDataRecovery. Sometimes, although real-time Final Data is old, it is still okay. Hope to help you.