标签归档：坏块修复工具

在win平台上开发了Oracle Recovery Tools小工具,可以实现坏块的快速恢复功能

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具体参考相关文章:自研Oracle恢复小工具
由于之前工具使用c#开发不太方便实现跨平台(而且图形化在linux等操作系统上使用起来不方便),现在使用c语言写了小工具:Patch_blk(主要是seq_kcbh tailchk checksum类似坏块处理),模拟两个坏块

BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/xifenfei/system01.dbf
BLOCK = 521

Block 521 is corrupt
Corrupt block relative dba: 0x00400209 (file 0, block 521)
Fractured block found during verification
Data in bad block:
 type: 6 format: 2 rdba: 0x00400209
 last change scn: 0x0000.000001d7 seq: 0x1 flg: 0x06
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0x01d706fe
 check value in block header: 0x5205
 computed block checksum: 0x0


DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing   (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing   (Index): 0
Total Blocks Empty            : 0
Total Blocks Marked Corrupt   : 1
Total Blocks Influx           : 2
Message 531 not found;  product=RDBMS; facility=BBED


BBED> verify block 522
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/xifenfei/system01.dbf
BLOCK = 522

Block 522 is corrupt
Corrupt block relative dba: 0x0040020a (file 0, block 522)
Fractured block found during verification
Data in bad block:
 type: 6 format: 2 rdba: 0x0040020a
 last change scn: 0x0000.000001d7 seq: 0xff flg: 0x06
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0x01d70601
 check value in block header: 0x1e16
 computed block checksum: 0x0


DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing   (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing   (Index): 0
Total Blocks Empty            : 0
Total Blocks Marked Corrupt   : 1
Total Blocks Influx           : 2
Message 531 not found;  product=RDBMS; facility=BBED

配置坏块修复列表文件

[root@iZbp11c0qyuuo1gr7j98upZ tmp]# cat 1.txt
/u01/app/oracle/oradata/xifenfei/system01.dbf  521 8192 N
/u01/app/oracle/oradata/xifenfei/system01.dbf  522 8192 Y 

--列表文件说明
数据文件路径 文件号 数据块大小 是否人工干预(N表示不需要,Y表示需要)

执行修复操作

[root@iZbp11c0qyuuo1gr7j98upZ tmp]# ./Patch_blk 1.txt


===== Processing line 1 =====
=====================================================
Processing: File=/u01/app/oracle/oradata/xifenfei/system01.dbf, Block=521, Size=8192, Mode=N
=====================================================

=== Step 1: Check seq_kcbh ===
  Current value: 0x01
  [OK] seq_kcbh is normal

=== Step 2: Check tailchk ===
  Current (reversed): 0x01D706FE
  Expected (reversed): 0x01D70601
  [Auto-repair] tailchk mismatch, will fix
  [Backup] Block saved to: ./20251104_230616/system01.dbf_block521
  [Success] tailchk fixed
  [Verify] New tailchk (reversed): 0x01D70601

=== Step 3: Check checksum  ===
  Current checksum: 0x0552
  Computed checksum: 0xFA52
  [Auto-repair] Checksum mismatch, will fix
  [Success] Checksum fixed
  [Verify] New checksum: 0xFA52

=== Step 4: Final Verification ===
  seq_kcbh: 0x01 (not 0xFF: PASS)
  tailchk: 0x01D70601 (expected 0x01D70601: PASS)
  Checksum: 0xFA52 (expected 0xFA52: PASS)

[Result] Block repair completed successfully


===== Processing line 2 =====
=====================================================
Processing: File=/u01/app/oracle/oradata/xifenfei/system01.dbf, Block=522, Size=8192, Mode=Y
=====================================================

=== Step 1: Check seq_kcbh ===
  Current value: 0xFF
  [WARNING] Block is marked as BAD. Repair? (yes/no): y
  [Backup] Block saved to: ./20251104/system01.dbf_block522
  [Success] seq_kcbh updated to 0x01

=== Step 2: Check tailchk ===
  Current (reversed): 0x01D70601
  Expected (reversed): 0x01D70601
  [OK] tailchk is normal

=== Step 3: Check checksum ===
  Current checksum: 0x161E
  Computed checksum: 0xE81E
  [WARNING] Checksum mismatch. Repair? (yes/no): y
  [Success] Checksum fixed
  [Verify] New checksum: 0xE81E

=== Step 4: Final Verification ===
  seq_kcbh: 0x01 (not 0xFF: PASS)
  tailchk: 0x01D70601 (expected 0x01D70601: PASS)
  Checksum: 0xE81E (expected 0xE81E: PASS)

[Result] Block repair completed successfully


=====================================
Processing complete. Total: 2
  Modify Success: 2
  Modify None: 0
  Skipped/Failed: 0
  Blocks Backed Up: 2
=====================================

在修复坏块之前会对相关block进行备份

[root@iZbp11c0qyuuo1gr7j98upZ 20251104]# ls -ltra
total 24
-rw-r--r--   1 root root 8192 Nov  4 22:42 system01.dbf_block521
-rw-r--r--   1 root root 8192 Nov  4 22:42 system01.dbf_block522
drwxr-xr-x   2 root root 4096 Nov  4 22:42 .
drwxrwxrwt. 14 root root 4096 Nov  4 23:39 ..
[root@iZbp11c0qyuuo1gr7j98upZ 20251104]# 

Patch_blk修复坏块之后,检查坏块正常

BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/xifenfei/system01.dbf
BLOCK = 521


DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing   (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing   (Index): 0
Total Blocks Empty            : 0
Total Blocks Marked Corrupt   : 0
Total Blocks Influx           : 0
Message 531 not found;  product=RDBMS; facility=BBED


BBED> verify block 522
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/xifenfei/system01.dbf
BLOCK = 522


DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing   (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing   (Index): 0
Total Blocks Empty            : 0
Total Blocks Marked Corrupt   : 0
Total Blocks Influx           : 0
Message 531 not found;  product=RDBMS; facility=BBED

对于不太熟悉bbed的客户,可以通过这个工具快速实现常见坏块类型恢复