分类目录归档：Oracle备份恢复

近期有客户由于虚拟化平台系统负载过高,重启之后导致数据库出现一些坏块

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其中被框起来的坏块比较好处理,属于数据库中间某个对象的block,对异常对象进行处理即可,但是有一个block 2，block 10 这种都属于数据文件中位图块(用来记录哪些block被使用,哪些block是没有使用),这种block如果损坏会导致该文件无法分配新的空间(也不能回收空间,无法统计表空间使用情况等)

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alert日志有大量报错

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对于这种情况,直接使用obet的坏块修复功能

OBET> set file 116
filename set to: /oradata/NNC_DATA207.dbf (file# 116)
endian auto-detected: little

OBET> set block 10
block set to: 10

OBET> backup
Backing up file #116, block 10
Successfully backed up block 10 from /oradata/NNC_DATA207.dbf to backup_blk/NNC_DATA207.dbf.10_20260902200547.blk

OBET> repair block
Warning: Missing value for 'block', using global setting: 10

Repairing block 10 in file /oradata/NNC_DATA207.dbf...

Repair analysis for block 10:
1. seq_kcbh check: 0xFF -> needs repair (0x01)
2. Tailchk check: 0x00001EFF -> needs repair (0x00001E01)
3. Checksum check: 0xCBC7 -> OK

Confirm repair operations:
File: /oradata/NNC_DATA207.dbf
Block: 10
Operations needed: fix offset14, fix tailchk
Confirm? (Y/YES to proceed): y

Verification after repair:
1. seq_kcbh: 0x01 OK
2. Tailchk: 0x00001E01 OK
3. Checksum: 0xCBC7 OK

Block 10 repair completed successfully.

OBET>

OBET> set file 119
filename set to: /oradata/NNC_DATA210.dbf (file# 119)
endian auto-detected: little

OBET> set block 2
block set to: 2

OBET> backup
Backing up file #119, block 2
Successfully backed up block 2 from /oradata/NNC_DATA210.dbf to backup_blk/NNC_DATA210.dbf.2_20260902200645.blk

OBET> repair block
Warning: Missing value for 'block', using global setting: 2

Repairing block 2 in file /oradata/NNC_DATA210.dbf...

Repair analysis for block 2:
1. seq_kcbh check: 0xFF -> needs repair (0x01)
2. Tailchk check: 0x00001DFF -> needs repair (0x00001D01)
3. Checksum check: 0x80EC -> OK

Confirm repair operations:
File: /oradata/NNC_DATA210.dbf
Block: 2
Operations needed: fix offset14, fix tailchk
Confirm? (Y/YES to proceed): y

Verification after repair:
1. seq_kcbh: 0x01 OK
2. Tailchk: 0x00001D01 OK
3. Checksum: 0x80EC OK

Block 2 repair completed successfully.

OBET> exit
Exiting OBET.

使用dbv检测,位图坏块全部修复

[oracle@nccdb ~]$ dbv file=/oradata/NNC_DATA210.dbf

DBVERIFY: Release 11.2.0.4.0 - Production on Wed Sep 2 20:07:15 2026

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = /oradata/NNC_DATA210.dbf


DBVERIFY - Verification complete

Total Pages Examined         : 4194302
Total Pages Processed (Data) : 3472440
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 205988
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 515867
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 7
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 751241252 (22.751241252)
[oracle@nccdb ~]$ dbv file=/oradata/NNC_DATA207.dbf

DBVERIFY: Release 11.2.0.4.0 - Production on Wed Sep 2 20:08:23 2026

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = /oradata/NNC_DATA207.dbf


DBVERIFY - Verification complete

Total Pages Examined         : 4194302
Total Pages Processed (Data) : 3471468
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 204185
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 518642
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 7
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 751241266 (22.751241266)

后续数据顺利导出,完成这次恢复

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