目的：将已经offline掉的datafile 5 的scn信息改为与其他datafile一致。
db版本为11.2.0.4
背景知识：
1、datafile 的file header 存储在第一个block里
2、Oracle considers four attributes of this data structure when determining if a datafile is sync with the other data files of the database:（不同oracle版本offset可能不同）
（1）kscnbas (at offset 140) – SCN of last change to the datafile.
（2）kcvcptim (at offset 148) -Time of the last change to the datafile.
（3）kcvfhcpc (at offset 176) – Checkpoint count.
（4）kcvfhccc (at offset 184) – Unknown, but is always 1 less than thecheckpoint point count.
Oracle有4个属性来判断datafile 是否和其他的datafile 一致，如果都一致，可以正常操作，如果不一致，那么会报ORA-01113错误
bbed password=blockedit blocksize=8192 listfile=/home/oracle/bbed.file mode=edit /home/oracle/bbed.file的内容如下： 1 /u01/app/oracle/oradata/test/system01.dbf 849346560 2 /u01/app/oracle/oradata/test/sysaux01.dbf 3470786560 3 /u01/app/oracle/oradata/test/undotbs01.dbf 251658240 4 /u01/app/oracle/oradata/test/users01.dbf 382730240 5 /u01/app/oracle/oradata/test/ten01.dbf 52428800 6 /u01/app/oracle/oradata/test/tb_test_01.dbf 5242880 7 /u01/app/oracle/oradata/test/ts1.dbf 524288000 8 /u01/app/oracle/oradata/test/ts2.dbf 524288000 9 /u01/app/oracle/oradata/test/test01.dbf 52428800 10 /u01/app/oracle/oradata/test/test_uni_sz_2m_01.dbf 52428800 11 /u01/app/oracle/oradata/test/test_uni_sz_1m_01.dbf 209715200 12 /u01/app/oracle/oradata/test/test.dbf 10485760
?
如上内容，可以用如下语句来生成：
select file#||' '||name||' '||bytes from v$datafile;
?
BBED> set dba 1,1
DBA 0x00400001 (4194305 1,1)
BBED> p kcvfhckp
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484
ub4 kscnbas @484 0x0036b5c8--->
ub2 kscnwrp @488 0x0000
ub4 kcvcptim @492 0x344bc95d--->
ub2 kcvcpthr @496 0x0001
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x00000001
ub4 kcrbabno @504 0x000021e7
ub2 kcrbabof @508 0x0010
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00
BBED> p kcvfhcpc
ub4 kcvfhcpc @140 0x00000168--->
BBED> p kcvfhccc
ub4 kcvfhccc @148 0x00000167--->
?
BBED> set dba 5,1
DBA 0x01400001 (20971521 5,1)
BBED> p kcvfhckp
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484
ub4 kscnbas @484 0x00369818--->
ub2 kscnwrp @488 0x0000
ub4 kcvcptim @492 0x344b98b3--->
ub2 kcvcpthr @496 0x0001
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x00000098
ub4 kcrbabno @504 0x0000b62c
ub2 kcrbabof @508 0x0010
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00
BBED> p kcvfhcpc
ub4 kcvfhcpc @140 0x00000104--->
BBED> p kcvfhccc
ub4 kcvfhccc @148 0x00000103--->
?
======================================================================================
下面开始修改：
BBED> set dba 5,1
DBA 0x01400001 (20971521 5,1)
BBED> m /x c8b53600 offset 484
BBED-00209: invalid number (c8b53600)
BBED> m /x c8b5
File: /u01/app/oracle/oradata/test/ten01.dbf (5)
Block: 1 Offsets: 484 to 487 Dba:0x01400001
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