一个测试库异常宕机，启动数据时，报错如下：
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01122: database file 5 failed verification check
ORA-01110: data file 5: '/u01/oradata/dbbbed/tbst01.dbf'
ORA-01207: file is more recent than control file - old control file
一、关于ORA-01207错误解释
$ oerr ora 01207
01207, 00000, "file is more recent than control file - old control file"
// *Cause: The control file change sequence number in the data file is
// greater than the number in the control file. This implies that
// the wrong control file is being used. Note that repeatedly causing
// this error can make it stop happening without correcting the real
// problem. Every attempt to open the database will advance the
// control file change sequence number until it is great enough.
// *Action: Use the current control file or do backup control file recovery to
// make the control file current. Be sure to follow all restrictions
// on doing a backup control file recovery.
从上面的解释看出，造成ora-01207错误的是由于数据文件头部记录控制seq号比控制文件中记录的值大。
二、问题排查
–查看数据文件头部记录的控制文件seq号
说明：数据文件头部记录的控制文件seq号位于 offset 40，如下:
BBED> set file 5 block 1
FILE# 5
BLOCK# 1
BBED> p kcvfh
....................................
ub4 kccfhcsq @40 0x00000f9b 转换为10进制为3995
–bbed查看文件头部信息和通过表x$kcvfh查询到的值一样(fhcsq为控制文件seq号）
SQL> select hxfil,fhcsq,fhscn,fhrba_seq,fhcpc from x$kcvfh;
HXFIL FHCSQ FHSCN FHRBA_SEQ FHCPC
---------- ---------- ---------------- ---------- ----------
1 3739 1978449 42 306
2 3739 1978449 42 308
3 3739 1978449 42 227
4 3739 1978449 42 305
5 3995 1978449 42 295
