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标题：obet快速修改scn/resetlogs恢复数据库(缺少归档,ORA-00308）
作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]
最初是由于业务系统报ORA-01578导致
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)
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.
