Oracle数据库遇到ORA-01578坏块错误的原因是什么，求解释？

【Oracle数据恢复】ORA-01578错误解析

一般认为ORA-1578是 数据块物理坏块/损坏的一种，不同于逻辑损坏/坏块，其错误信息如下：

[oracle@oel8 dirdat]$ oerr ora 1578

01578, 00000, "ORACLE data block corrupted (file # %s, block # %s)"

// *Cause: The data block indicated was corrupted, mostly due to software

// errors.

// *Action: Try to restore the segment containing the block indicated. This

// may involve dropping the segment and recreating it. If there

// is a trace file, report the errors in it to your ORACLE

// representative

这个1578一般 会伴随ORA-1110出现，一旦ORACLE读取到存在损坏的块就会报出:

SQL>select * from scott.emp

select * from scott.emp

*

ERROR at line 1:

ORA-01578: ORACLE data block corrupted (file # 11, block # 34) 这里的FILE#是 RFN

ORA-01110: data file 6:'/home/oracle/corrclass.dbf' 这里的是AFN

断裂的数据块Fractured Block：

Corrupt block relative dba: 0x0380e573 (file 14, block 58739)

Fractured block found during buffer read

Data in bad block -

type: 6 format: 2 rdba: 0x0380e573

last change scn: 0x0288.8e5a2f78 seq: 0x1 flg: 0x04

consistency value in tail: 0x00780601

check value in block header: 0x8739, computed block checksum: 0x2f00

spare1: 0x0, spare2: 0x0, spare3: 0x0

***

Reread of rdba: 0x0380e573 (file 14, block 58739) found same corrupted data

或者错误的校验和checksum

Corrupt block relative dba: 0x0380a58f (file 14, block 42383)

Bad check value found during buffer read

Data in bad block -

type: 6 format: 2 rdba: 0x0380a58f

last change scn: 0x0288.7784c5ee seq: 0x1 flg: 0x06

consistency value in tail: 0xc5ee0601

check value in block header: 0x68a7, computed block checksum: 0x2f00

spare1: 0x0, spare2: 0x0, spare3: 0x0

***

Reread of rdba: 0x0380a58f (file 14, block 42383) found same corrupted data

或者错误的块头

Corrupt block relative dba: 0x0d805a89 (file 54, block 23177)

Bad header found during buffer read

Data in bad block -

type: 6 format: 2 rdba: 0x0d805b08

last change scn: 0x0692.86dc08e3 seq: 0x1 flg: 0x04

consistency value in tail: 0x08e30601

check value in block header: 0x2a6e, computed block checksum: 0x0

spare1: 0x0, spare2: 0x0, spare3: 0x0

***

Reread of rdba: 0x0d805a89 (file 54, block 23177) found valid data

一些可能引起ORA-1578的BUG 列表如下：

如果自己搞不定可以找ASKMACLEAN专业数据库修复团队成员帮您恢复!

Oracle DBA神器：PRM-DUL灾难恢复工具，Schema级别数据恢复。PRM-DULFor Oracle Database – schema级别oracle数据库数据恢复特性 ，PRM-DUL即ParnassusData Recovery Manager是企业级别Oracle数据库灾难恢复工具。PRM可以在无备份的情况下恢复被truncated掉的表，也可以恢复无法打开的Oracle数据库(Alter Database Open失败)中的数据。

---