obet快速修改scn/resetlogs恢复数据库(缺少归档,ORA-00308）

最初是由于业务系统报ORA-01578导致

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然后相关人员上来进行了一系列操作,包括但不限于offline文件,create datafile 44,recover datafile,还尝试做resetlogs,使用备份控制文件还原等等.我接手该故障的时候状态

44号文件状态是12月1日的,而且resetlogs信息也不对.通过和客户沟通,确认是他们在没有备份44号文件的前提下直接执行了类似alter database create datafile 44的命令,但是在应用了写归档之后,发现提示有归档不存在

 

ALTER DATABASE RECOVER    CONTINUE DEFAULT

Media Recovery Log /data/app/oracle/archive/orcl/1_181285_1103629544.dbf

ORA-279 signalled during: ALTER DATABASE RECOVER    CONTINUE DEFAULT  ...

ALTER DATABASE RECOVER    CONTINUE DEFAULT

Media Recovery Log /data/app/oracle/archive/orcl/1_181286_1103629544.dbf

Tue Jan 06 12:48:12 2026

Errors with log /data/app/oracle/archive/orcl/1_181286_1103629544.dbf

Errors in file /data/app/oracle/diag/rdbms/orcl8/orcl/trace/orcl_pr00_8338.trc:

ORA-00308: cannot open archived log '/data/app/oracle/archive/orcl/1_181286_1103629544.dbf'

ORA-27037: unable to obtain file status

Linux-x86_64 Error: 2: No such file or directory

Additional information: 3

分析现存归档,确实发现12月1日之后丢失了部分归档日志(归档不连续)

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基于这种情况(故障数据文件直接被覆盖,归档又出现了多天的连续断档,而且没有有效备份),只能先打开数据库,然后根据情况导出数据,然后导入到新库中.这里我直接使用obet来修改resetlogs和checkpoint 信息,实现数据库快速打开

 

OBET> help

OBET (Oracle Block Editor Tool) commands:

  open <config_file>    - Load file list from config file (format: <num> <path>)

  info                  - Show loaded file list (from open command)

  set filename <path>   - Set target file path (required)

  set file <num>        - Set filename using loaded file number (from open list)

  set blocksize <size>  - Set block size (2048,4096,[8192],16384,32768)

  set block <num>       - Set block number (starts from 0, default: 1)

  set offset <offset>   - Set offset within block (< blocksize, default: 0)

  set count <bytes>     - Set number of bytes to read (default: 32)

  set mode edit/browse  - Enable edit/browse mode

  d/dump [options]      - Display data (options: block X, offset Y, count N)

  m/modify <hex> [opts] - Modify data with hex (opts: block X, offset Y)

  undo                  - Undo last modification

  sum [block X]         - Calculate checksum for block (default: current block)

  sum apply [block X]   - Apply checksum: write calculated value to block

  tailchk [block X]     - Calculate tailchk for block (default: current block)

  tailchk apply [block X] - Apply tailchk: write calculated value to block

  repair [block X]      - Repair bad block (fix seq_kcbh, tailchk, checksum)

  copy data <src> to <dest>  - Copy data between files

    <src> format: file,block,offset,count (e.g., 1,1,10,64)

    <dest> format: file[,block][,offset] (e.g., 3 or 3,1 or 3,1,128)

  copy block file#,block# to file#,block#     - Copy entire data block

  copy chkscn file n to file m         - Copy datafile header checkpoint SCN info

  copy resetlogscn file n to file m    - Copy datafile header resetlogs info

  backup [file n] [block m] - Backup data block (optional file and block parameters)

  corrupt [block X]     - Mark block as corrupted (default: current block)

  show                  - Display current settings (filename, blocksize, block, offset, count, mode)

  license               - Show/manage software license (registration code required)

  version               - Show software version and developer information

  p/print <param>       - Print Oracle structure,Use the 'p/print' command to see details

  undo                  - Undo the last copy chkscn or copy resetlogscn operation

  spool <file>          - Start logging to file (spool off to stop)

  help                  - Show this help message

  quit/exit             - Exit OBET

 

OBET> open 1.txt                

Loaded 2 files from config file '1.txt'.

 

OBET> info

 

Loaded files (2 total):

----------------------------------------

Number  Path

----------------------------------------

     1  /data/app/oracle/oradata/orcl/system01.dbf

    44  /data/app/oracle/oradata/orcl/xff26.dbf

----------------------------------------

 

OBET> set file 44

filename set to: /data/app/oracle/oradata/orcl/xff26.dbf (file#44)

 

OBET> d

 

File: /data/app/oracle/oradata/orcl/xff26.dbf

Block: 1                Offsets:     0 to    31

--------------------------------------------------------------------------------

0xifenfei000 0BA20000 0100000B 00000000 00000104 B05F0000 00000000 0004200B 65583D61

 

<32 bytes read>

 

 

OBET> backup file 44 block 1

Created backup directory: backup_blk

Successfully backed up block 1 from file#44 to /tmp/backup_blk/xff26.dbf_1.20260106182405

 

OBET> copy resetlogscn file 1 to file 44

Error: Edit mode not enabled. Use 'set mode edit' first.

 

OBET> set mode edit    

mode set to: edit

 

OBET> copy resetlogscn file 1 to file 44

 

Confirm Modify resetlogscn:

Source: file#1 (/data/app/oracle/oradata/orcl/system01.dbf)

Target: file#44 (/data/app/oracle/oradata/orcl/xff26.dbf)

Proceed? (Y/YES to confirm): y

Successfully copied resetlog SCN information from file#1 to file#44.

 

OBET> copy chkscn file 1 to file 44

 

Confirm Modify chkscn:

Source: file#1 (/data/app/oracle/oradata/orcl/system01.dbf)

Target: file#44 (/data/app/oracle/oradata/orcl/xff26.dbf)

Proceed? (Y/YES to confirm): y

Successfully copied checkpoint SCN information from file#1 to file#44.

 

OBET> tailchk

Check tailchk for File /data/app/oracle/oradata/orcl/xff26.dbf, Block 1:

current = 0x010B0000, required = 0x010B0000

 

OBET> sum

Check value for File /data/app/oracle/oradata/orcl/xff26.dbf, Block 1:

current = 0xB05F, required = 0x6DA3

 

OBET> sum apply

 

Confirm applying checksum:

File: /data/app/oracle/oradata/orcl/xff26.dbf

Block: 1

Offset in block: 16 (file offset: 0x0xifenfei010)

Original value: 0xB05F

New value:      0x6DA3

Confirm? (Y/YES to proceed): y

Verification successful: Stored checksum matches calculated value (0x6DA3).

Checksum applied successfully.

然后重建ctl正常打开数据库

[oracle@xifenfei check_db]$ sqlplus / as sysdba

 

SQL*Plus: Release 11.2.0.4.0 Production on Tue Jan 6 18:29:22 2026

 

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

 

Connected to an idle instance.

 

SQL> startup mount pfile='/tmp/pfile';

ORACLE instance started.

 

Total System Global Area 6.8413E+10 bytes

Fixed Size          2270360 bytes

Variable Size        3.3554E+10 bytes

Database Buffers     3.4762E+10 bytes

Redo Buffers           93585408 bytes

Database mounted.

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01190: control file or data file 1 is from before the last RESETLOGS

ORA-01110: data file 1: '/data/app/oracle/oradata/orcl/system01.dbf'

 

 

SQL> shutdown immediate;

ORA-01109: database not open

 

 

Database dismounted.

ORACLE instance shut down.

SQL>

SQL>

SQL> startup nomount pfile='/tmp/pfile

';

ORACLE instance started.

 

Total System Global Area 6.8413E+10 bytes

Fixed Size          2270360 bytes

Variable Size        3.3554E+10 bytes

Database Buffers     3.4762E+10 bytes

Redo Buffers           93585408 bytes

SQL> @ctl.sql

 

Control file created.

 

SQL> SQL> recover database;

ORA-00283: recovery session canceled due to errors

ORA-00264: no recovery required

 

 

SQL> alter database open;

 

Database altered.

后续根据情况选择导出表,对于导出报错的表再进行二次处理.