ora-01200错误的分析

 

一 触发 ora-01200 错误的原因

 

[oracle@oracle ~]$ oerr ora 01200

01200, 00000, "actual file size of %s is smaller than correct size of %s blocks"

// *Cause: The size of the file as returned by the operating system is smaller

//          than the size of the file as indicated in the file header and the

//          control file. Somehow the file has been truncated. Maybe it is the

//          result of a half completed copy.

// *Action: Restore a good copy of the data file and do recovery as needed.

数据文件实际块数小于数据文件头部记录的数据文件块数

 

二 用bbed构造一个ora-01200错误

 

1 数据文件/oracle/test/jiujian1.dbf实际占用块数如下：

 

SQL>  select file_name,blocks from dba_data_files where file_id=11;

 

FILE_NAME                           BLOCKS

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

/oracle/test/jiujian1.dbf                  1048

 

2 用bbed修改数据文件头部记录的数据文件占用块数

BBED> info

 File# Name                                                         Size(blks)

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

     1 /oracle/CRM2/system1.dbf                                         61440

     2 /oracle/CRM2/zxb.dbf                                              1280

     3 /oracle/CRM2/CRM/sysaux01.dbf                                    37120

     4 /oracle/CRM2/CRM/users01.dbf                                       640

     5 /oracle/CRM2/zxa.dbf                                             12800

     6 /oracle/CRM2/CRM/undotbs2.dbf                                    25600

     7 /oracle/CRM2/zxc.dbf                                              1280

     8 /oracle/CRM2/CRM/zxbig1.dbf                                     262144

    11 /oracle/test/jiujian1.dbf                                          128

 

BBED> set dba 11,1

        DBA             0x02c00001 (46137345 11,1)

 

BBED> p  offset 44       

kcvfh.kcvfhhdr.kccfhfsz

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

ub4 kccfhfsz                                 @44       0x00000418 （十进制1048）

 

BBED> set offset 44

        OFFSET          44

 

BBED> dump /v count 30

 File: /oracle/test/jiujian1.dbf (11)

 Block: 1        Offsets:   44 to   73 Dba:0x02c00001

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

 18040000 00200000 0b000300 00000000 l ..... ..........

 00000000 00000000 00000000 0000      l ..............

 

 <16 bytes per line>

 

BBED> modify /x 1904

Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y

 File: /oracle/test/jiujian1.dbf (11)

 Block: 1                 Offsets:   44 to   73           Dba:0x02c00001

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

 19040000 00200000 0b000300 00000000 00000000 00000000 00000000 0000

 

 <32 bytes per line>

 

BBED> p offset 44

kcvfh.kcvfhhdr.kccfhfsz

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

ub4 kccfhfsz                                 @44       0x00000419（10进制为1049）

 

BBED> sum apply

Check value for File 11, Block 1:

current = 0x34f4, required = 0x34f4

 

3 启动数据库便可触发ora-01200错误

SQL> startup

ORACLE instance started.

 

Total System Global Area 322961408 bytes

Fixed Size                   2020480 bytes

Variable Size               92277632 bytes

Database Buffers           222298112 bytes

Redo Buffers                 6365184 bytes

Database mounted.

ORA-01122: database file 11 failed verification check

ORA-01110: data file 11: '/oracle/test/jiujian1.dbf'

ORA-01200: actual file size of 1048 is smaller than correct size of 1049 blocks

 

三ora-01200错误的解决

 

方式1 通过bbed 改数据文件头部偏移量44处的值为数据文件实际占用块数

 

方式2 通过dd命令填充数据文件实际大小为correct size of 1049 blocks中的值

dd if=/dev/zero of=/oracle/test/jiujian1.dbf bs=8192 count=1 seek=1049