Oracle备份的控制文件和新的数据文件

核心提示： 我们看控制文件的信息（选择一个文件）:DATA FILE #4:(name #4) /opt/oracle/oradata/eygle/eygle01.dbfcreation size=0 block size=8192 status=0xe head=4 tail=4 dup=1tabl

我们看控制文件的信息（选择一个文件）:

DATA FILE #4:
　(name #4) /opt/oracle/oradata/eygle/eygle01.dbf
creation size=0 block size=8192 status=0xe head=4 tail=4 dup=1
tablespace 4, index=4 krfil=4 prev_file=0
unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
Checkpoint cnt:61 scn: 0x0000.002acb1e 08/11/2006 10:44:38
Stop scn: 0x0000.002acb1e 08/11/2006 10:44:38
Creation Checkpointed at scn:　0x0000.0015078d 06/06/2006 09:41:54

再看数据文件头信息:

FILE HEADER:
　　　　Software vsn=153092096=0x9200000, Compatibility Vsn=134217728=0x8000000
　　　　Db ID=1407686520=0x53e79778, Db Name='EYGLE'
　　　　Activation ID=0=0x0
　　　　Control Seq=989=0x3dd, File size=1280=0x500
　　　　File Number=4, Blksiz=8192, File Type=3 DATA
Tablespace #4 - EYGLE　rel_fn:4
Creation　 at　 scn: 0x0000.0015078d 06/06/2006 09:41:54
Backup taken at scn: 0x0000.00000000 01/01/1988 00:00:00 thread:0
reset logs count:0x232bee1f scn: 0x0000.0007c781 recovered at 08/11/2006 10:11:26
status:0x0 root dba:0x00000000 chkpt cnt: 64 ctl cnt:63
begin-hot-backup file size: 0
Checkpointed at scn:　0x0000.002acb98 08/11/2006 10:46:24

我们注意到数据文件的chkpt cnt: 64 要大约控制文件的Checkpoint cnt:61，也就是说控制文件是旧的。

此时尝试打开数据库就会出现如下错误:

[oracle@jumper udump]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Fri Aug 11 10:51:20 2006
Copyright (c) 1982, 2002, Oracle Corporation.　All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01122: database file 1 failed verification check
ORA-01110: data file 1: '/opt/oracle/oradata/eygle/system01.dbf'
ORA-01207: file is more recent than controlfile - old controlfile

Oracle告诉我们，控制文件是旧的。此时我们可以通过重建控制文件或者从旧的数据备份开始恢复。